This background information relates to the conclusions reached about the GSFC/Optronic calibrations for the 6-foot sphere. Both the hemispherical and the spherical integrating sources were remeasured in February 1988 by two experimenters and the results show a decrease in the output of the sphere. But the discrepancy between GSFC data and Optronic Data remains. The decrease in the output can be accounted for by a correction in the current value of power supplies Number 2 and Number 3. The...

Topics: NASA Technical Reports Server (NTRS), CALIBRATING, HEMISPHERICAL SHELLS, RADIANCE, SPHERES,...

A payload retention concept that may be utilized on Space Shuttle missions is investigated. This concept appears to embody all the desirable features for the very demanding requirements for space flight. Desirable features include light weight, low cost, high reliability, excellent load distribution, versatility, and insensitivity to critical alignment.

Topics: NASA Technical Reports Server (NTRS), RETAINING, SPACE SHUTTLE PAYLOADS, SPACECRAFT DESIGN,...

449
449

Jul 11, 2010
07/10

by
Lan, C. E

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A theoretical method is presented for predicting the lateral-directional stability derivatives of wing-body combinations with or without the blowing jet effect. The fuselage effect is accounted for by the axial distribution of vortex multiplets. Comparison of the predicted results with experiments and other theoretical methods show good agreement for configurations without the blowing jet. More applicable experimental data with blowing jets are needed to establish the accuracy of the theory.

Topics: CV-990 AIRCRAFT, OZONE, WATER VAPOR, HEMISPHERICAL SHELLS, POLLUTION MONITORING, U-2 AIRCRAFT,...

The radar scattering by a conducting hemisphere for incidence along the symmetry axis has been determined as a function of frequency, bistatic angle, and polarization. From this frequency domain information, the short- pulse response is constructed using Fourier synthesis. The range resolution thus afforded permits identification of various contributions to the scattering - in particular, that due to edge diffraction. Results obtained from the geometrical theory of diffraction are in...

Topics: DTIC Archive, Weiner, Stephen D, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *RADAR PULSES,...

The membrane solutions for non-symmetric vibration of a spherical dome are studied. The solutions are written in a convenient form, and it is shown how these reduce to the familiar membrane and inextensional solutions in the static limit. This information enables one to perceive several difficulties in finding inextensional frequencies by numerical means and to suggest ways around these difficulties. Also membrane frequencies are found for circumferential wave numbers up through eight by direct...

Topics: DTIC Archive, Ross, Jr, Edward W, ARMY NATICK LABS MA OFFICE OF THE SCIENTIFIC DIRECTOR,...

Measurements of the hemispherical reflectance of metallic surfaces with controlled surface roughness were made using a sulfur infrared integrating sphere and a Beckman DC2A spectrometer. The surfaces studied were ground glass and nickel coated with films of aluminum, gold, platinum, and nickel. The data indicate that beyond a certain ratio of surface roughness to incident wavelength, the normalized data for aluminum, gold, and platinum may be represented by a single curve. This was true for the...

Topics: DTIC Archive, Birkebak, R C, ARO INC ARNOLD AFS TN, *METAL COATINGS, *REFLECTION, ALUMINUM, GOLD,...

The analytic form of the velocity potential of a heaving hemisphere is studied. The potential is expanded in terms of a wave source and of wave free potentials, and the coefficients in the expansion are studied (1) when the dimensionless wave number Ka is small, and (2) when Ka is arbitrary. A typical result is that the virtual mass coefficient is the real part of ( n Ka i ) A1*(Ka) A1**(Ka)/( n Ka - i )A2*(Ka) A2**(Ka), where the functions A(Ka) are entire functions of Ka, real for real Ka....

Topics: DTIC Archive, Ursell, F, VICTORIA UNIV OF MANCHESTER (UNITED KINGDOM), *FLUID DYNAMICS, *POTENTIAL...

497
497

May 27, 2011
05/11

by
McShera, John T.; Keyes, J. Wayn

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A wind-tunnel investigation has been conducted to study the characteristics of a towed spherical balloon as a drag device at Mach numbers from 1.47 to 2.50, Reynolds numbers from 0.36 x 10(exp 6) to 1.0 x 10(exp 6) , and angles of attack from -15 to 15 deg. Towed spherical balloons were found to be stable at supersonic speeds. The drag coefficient of the balloon is reduced by the presence of a tow cable and a further reduction occurs with the addition of a payload. The balloon inflation...

Topics: CONDUCTIVE HEAT TRANSFER, SHAPES, HEAT TRANSFER COEFFICIENTS, AERODYNAMIC CONFIGURATIONS,...

The program was concerned with two aspects of this very broad problem; (1) the plastic deformation of fine-grained high purity hot pressed Al2O3 as compared with similarly processed but lower purity material and (2) the stress corrosion of polycrystalline MgO and whether a chemical or mechanical (dislocation) model for failure applies.

Topics: DTIC Archive, Rhodes, William H, AVCO CORP LOWELL MA SYSTEMS DIV, *ALUMINATES, *MAGNESIUM OXIDES,...

A finite-difference method for the large deformation elastic-plastic analysis of spherical caps is applied to predict the collapse strength of initially imperfect deep spherical shells. Twelve uniformly loaded hemispherical shell models with flat spots at their apex are analyzed. For each model, a number of shallow spherical regions containing the flat spot are selected from its domain. One of these selected shallow regions yields a minimum buckling pressure; this minimum value is taken as the...

Topics: DTIC Archive, Kao,Robert, GEORGE WASHINGTON UNIV WASHINGTON D C SCHOOL OF ENGINEERING AND APPLIED...

Eight, 66-in.-diameter, fabricated HY-80 steel hemispherical shells designed to fail by inelastic buckling were tested to observe the effects of initial imperfections and residual stresses on elastic behavior and collapse strength. The results demonstrate that the effect of secondary moments and residual stresses on collapse strength diminish as the ratio of elastic to inelastic buckling pressure increases. It was possible to predict the collapse pressures of these models within +10 or -10...

Topics: DTIC Archive, Costello, Malcolm G, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...

An analytical model, based on the kinetics theory of a drifting Maxwellian gas is used to determine the nonequilibrium molecular density distribution within a hemispherical shell open aft with its axis parallel to its velocity. The concept of a molecular shield in terrestrial orbit above 200 km is also analyzed using the kinetic theory of a drifting Maxwellian gas. Data are presented for the components of the gas density within the shield due to the free stream atmosphere, outgassing from the...

Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, HEMISPHERICAL SHELLS, MASS SPECTRA,...

Experimental techniques were developed for measuring slosh damping in a variety of tank and baffle configurations. The various methods were compared and shown to be in satisfactory agreement. The Able-Star damping investigation made use of one of the methods having the broadest application possibilities. A systematic variation of tank shape parameters is continuing in support of ballistic missile programs like ATLAS, TITAN, and THOR, and in preparation for the needs of future space explorations...

Topics: DTIC Archive, TRW SPACE TECHNOLOGY LABS LOS ANGELES CA, *PROPELLANT TANKS, CONFIGURATIONS, DAMPING,...

A small-deflection analysis is developed for the elastic interbay buckling of ring-stiffened cylindrical shells in which the influence of the rings on deformations before an during budkling is considered. Tests were carried out with a machined, ring-stiffened cylinder (BR-4B) subjected to external hydrostatic pressure Collapse was initiated by elastic asymmetric buckling of the shell. Strain easurements taken during the test demonstrated that the South ell method of determining buckling...

Topics: DTIC Archive, REYNOLDS, THOMAS E, DAVID TAYLOR MODEL BASIN WASHINGTON DC, *CYLINDRICAL BODIES,...

Tables of the electromagnetic scattering amplitude and cross section of a conducting hemisphere for nose-on incidence are presented as a function of frequency, bistatic angle and polarization. The tables give the real and imaginary parts of the scattering amplitude and the radar cross section normalized to pi R sq (R = hemisphere radius). Results are shown for kR (k = 2 pi/wavelength) from 0.2 to 20.0 in steps of 0.2, for bistatic angles from 0 degrees to 150 degrees in steps of 30 degrees and...

Topics: DTIC Archive, Weiner, Stephen D, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *ELECTROMAGNETIC...

Topics: DTIC Archive, AVIATION SAFETY ENGINEERING AND RESEARCH PHOENIX AZ, *AVIATION SAFETY, *HELMETS,...

The testing of various security-related and civilian protective structures is often done with explosive charges having cylindrical and other shapes. At long ranges, the characteristics of the blast wave are hardly affected by a complex charge configuration. However, at scaled distances between the charge and test structures, which are less than about 7 m/Kg1/3, there exists the phenomenon of blast wave enhancement relative to the more conventional hemispherical or spherical charge shapes. This...

Topics: DTIC Archive, APT RESEARCH INC HUNTSVILLE AL, *EXPLOSIVE CHARGES, EXPERIMENTAL DATA, TOOLS,...

This report is concerned with the theoretical evaluation of the buckling strength of a truncated hemisphere under axial tensile load. The edges of the shell are assumed to be restrained from moving radially or from rotating. Theoretical results were obtained by Vlasov's small deflection theory and Galerkin's method. The quick convergence of the series solution is demonstrated. Comparison of theoretical values with a few available experimental results is given.

Topics: DTIC Archive, YAO, JOHN C, AEROSPACE CORP EL SEGUNDO CA, *HEMISPHERICAL SHELLS, TENSILE PROPERTIES,...

Equations are compiled for moments of inertia, centroidal distances, radii of gyration, and other mathematical properties related to solids, thin shells, thin rods, plane areas, and ogival shapes.

Topics: DTIC Archive, Myers, Jack A, NAVAL ORDNANCE TEST STATION CHINA LAKE CA, *EQUATIONS, *GEOMETRY,...

An analysis of plastic stress waves for cylindrical metallic projectile in impact is extended to an analysis of a hemispherical shell suffereing plastic deformation during the process of impact. It is assumed that the hemispherical shell with a prescribed launch velocity impinges a fixed rigid sphere of diameter equal to the internal diameter of the shell. The dynamic biaxial state of stress present in the shell during deformation is investigated. The analysis is valuable for studying the state...

Topics: NASA Technical Reports Server (NTRS), HEMISPHERICAL SHELLS, IMPACT LOADS, PLASTIC DEFORMATION,...

Revised and newly developed formulas for prediction of plastic deformations of structural elements in suppressive structures are presented in this report. These equations give improved agreement with literature, data and solutions for more structural elements than previous reports.

Topics: DTIC Archive, Westine, P. S., Cox, P. A., SOUTHWEST RESEARCH INST SAN ANTONIO TX, *PLASTIC...

The drag of a number of bodies having some resemblance to aerodynamic deceleration devices was measured in free stream and in the wake of an ogival cylinder. The diameter ratio of the wake producing and the deceleration devices as well as the distance between the two bodies was varied. With the exception of the sphere, the drag of the deceleration device located in the wake is less than its free stream drag.

Topics: DTIC Archive, HEINRICH, HELMUT G, MINNESOTA UNIV MINNEAPOLIS, *AERODYNAMIC CHARACTERISTICS,...

The object of the invention is a parachute with a canopy in the form of a circular belt. To increase its coefficient of lift and its stability, it is equipped with a small hemispherical canopy, the shroud lines of which go through an eye ring that is fastened to the central shroud line and the external rim is connected with the internal edge by four mutually perpendicular shroud lines.

Topics: DTIC Archive, Efremov, E F, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSONAFB OH, *PARACHUTES, USSR,...

Separation patterns of three-dimensional flow are discussed here, partly on the basis of limited calculated results, but mostly on experimental observations and intuition. Generally the separation pattern is rather independent of whether the boundary layer is laminar or turbulent and whether the flow is incompressible or hypersonic. The difference is in degree, not character. Various three-dimensional separation criteria are reviewed and the open-vs-closed separation idea, particularly is...

Topics: DTIC Archive, Wang,K C, MARTIN MARIETTA LABS BALTIMORE MD, *FLOW SEPARATION, *THREE DIMENSIONAL...

For a rigid body subject to no moments, the integral curves of the differential equations for the angular velocity are intersections of the energy and angular momentum ellipsoids, which have common centers and principal axes. If the solid contains a cavity that is topologically equivalent to the interior of a sphere completely filled with non-viscous incompressible fluid, these properties remain valid. But if the cavity is topolocially equivalent to the interior of a torus, the fluid may have a...

Topics: DTIC Archive, Giese, J H, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *BODIES OF...

Topics: DTIC Archive, KUETHE, A M, ADVISORY GROUP FOR AERONAUTICAL RESEARCH AND DEVELOPMENT PARIS (FRANCE),...

281
281

Jun 21, 2010
06/10

by
Clayton, R. M

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Combustion performance of liquid rocket engine studied in presence of several near-wall injection conditions

Topics: ABLATIVE NOSE CONES, MARS ATMOSPHERE, REENTRY SHIELDING, SANDWICH STRUCTURES, SPACECRAFT...

Checkout is continuing on the computer program for springback and mechanics of blank deformation. Experimental studies on die design criteria are continuing. Preliminary results on energy transfer in explosive welding are presented. Additional data on strain rate effects is presented. Preliminary designs of charge shapes for explosive punching of armor are discussed. The work on explosive forming of rings is being extended to include experiments in large deformations. The effort on...

Topics: DTIC Archive, Mote, Jimmy D, MARTIN MARIETTA AEROSPACE DENVER CO CENTER FOR HIGH ENERGY FORMING,...

The CV-990 aircraft coordinated several flights with a NASA U-2 aircraft, NOAA ground station measurements in Alaska, Hawaii, and American Samoa, and with Australian and New Zealand ground stations, aircraft, and a balloon experiment in the Southern hemisphere. Data were obtained for species including ozone, total ozone, the oxides of nitrogen, the chlorofluoromethanes, water vapor, nitric acid, carbon monoxide, carbon dioxide, hydrogen chloride, Aitken nuclei, ammonia, aerosols, temperatures,...

Topics: NASA Technical Reports Server (NTRS), CV-990 AIRCRAFT, HEMISPHERICAL SHELLS, POLLUTION MONITORING,...

Air blast was measured from the detonation of a mixture of oxygen and propane equivalent to 20 tons of TNT in a hemispherical balloon anchored to the ground surface. Measured values of shock arrival time, overpressure, duration of positive and negative phase, overpressure impulse, dynamic pressure, and dynamic pressure impulse are plotted as functions of ground range. Pressure-distance comparisons with TNT show the overpressure to be less than TNT at pressures greater than 30 psi. Comparisons...

Topics: DTIC Archive, Reisler, Ralph E, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *NUCLEAR...

This report describes in detail the development of a predictive technique for determining the optimum mooring attachment point for a hemispherical buoy in a swift-running river current. Representative analyses, which were performed to demonstrate the utility of the technique for observing trends and, in general, to give the user a feel for the impact of specific design parameters on the performance of such buoys, are included also. Finally, the authors offer conclusions and recommendations for...

Topics: DTIC Archive, Kaplan,Paul, OCEANICS INC PLAINVIEW N Y, *HYDRODYNAMICS, *MOORING BUOYS, TEST AND...

This report documents the successful efforts to manufacture a subscale stretched acrylic canopy transparency of near uniform thickness. The report also provides the results of high temperature acrylic tensile tests, simple geometry forming tests and finite element computer models.

Topics: DTIC Archive, Hopkins, R., SWEDLOW INC GARDEN GROVE CA, *MATHEMATICAL MODELS, *COMPUTERIZED...

Selected results are presented from heat-transfer pressure distribution tests of the Gemini exit and re-entry configurations and a hemisphere-cylinder configuration in the hypersonic regime. The effects of configuration, model attitude, and Reynolds number variation on heat-transfer and pressure distributions on the Gemini vehicle were investigated. The tests were conducted at Mach numbers of 8 and 10 and various free-stream Reynolds numbers. The angle- of-attack range was from -40 to 40 deg....

Topics: DTIC Archive, Pritts, O R, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *MANNED SPACECRAFT,...

Investigation of the interference heating phenomenon was conducted at Mach number 8 over a Reynolds number range from 400 thousand to 3.7 million per ft in the hypersonic wind tunnel. Shock generator models consisted of 1.5, 5, 10 and 15 deg wedges; 2.5, 7.5 and 12.5 deg cones; .5 and 2.0 in. diameter hemispheres, and an orbiter-type vehicle. Shock receiver models included sharp and blunt flat plates and a booster vehicle. Both pressure distributions and heat transfer distributions were...

Topics: DTIC Archive, Haslett, Robert A, GRUMMAN AEROSPACE CORP BETHPAGE NY, *HYPERSONIC FLIGHT,...

Results of an experimental investigation to determine the stagnation point velocity gradients for a family of blunt axisymmetric shapes at hypersonic Mach numbers are presented. Data presented in the form of model pressure distributions and stagnation point Mach number gradients are compared with existing data and theories. Although not accurately predicting the results, Newtonian theory is shown to provide a good basis for data correlation. Variations in model pressure distribution and...

Topics: DTIC Archive, Trimmer, L L, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *STAGNATION POINT,...

The HELP computer code (BRLHELP) which is maintained on the CDC 7600 computers at the Ballistic Research Laboratory, Aberdeen Proving Ground, Maryland and the Ballistic Missile Defense Advanced Technology Center in Huntsville, Alabama, is described. Three shaped charge design applications, a 43 mm conical shaped charge, a hemispherical shaped charge, and an impacting copper wedge, are discussed. Input decks and selected output for each problem are listed, and results are compared with...

Topics: DTIC Archive, Lacetera, joseph, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPUTER...

The efforts of this project considered two technological aspects of rectennas systems. One technology that was emphasized power-adaptive- rectifying circuits (PARCs). If a rectenna system is to be integrated into an autonomous vehicle system and fed by a stationary microwave source, the electromagnetic power incident on the rectenna will vary with the distance between - the source and the rectenna. Consequently, the output power from the rectenna could vary dramatically with small changes in...

Topics: DTIC Archive, Ziolkowski, Richard W, ARIZONA UNIV TUCSON DEPT OF ELECTRICALAND COMPUTER...

Volume V of the Ocean Engineering Series is a compilation of three technical reports that discuss the performance of spherical shell acrylic windows having different edge configurations. The coverage describes both spherical shell hemispheres with equatorial flanges and spherical shell sectors with square edges. In addition, their static and cyclic fatigue lives are compared to spherical shell sectors with beveled edges. The superior cyclic fatigue life and lower fabrication costs of spherical...

Topics: DTIC Archive, Stachiw, J D, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, *SPHERES, *HEMISPHERICAL...

This report is concerned with axisymmetric as well as nonsymmetric vibrations of open nonshallow thin elastic spherical shells. Without employing the usual auxiliary variables for reduction of shell motion equations introduced by Van der Neut and Berry, independent analytical solutions for middle-surface displacements are obtained and explicitly expressed in terms of associated Legendre functions. In order to gain physical insights into the free-vibration characteristics of an open nonshallow...

Topics: DTIC Archive, Lin, Gau-Feng, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...

Twenty-four acrylic plastic windows in the shape of hemispherical domes with equatorial flanges have been thermoformed from flat sheets and tested under short-term, long-term, and cyclic pressure loading at 65 to 75 F (18.5 to 24.1 C) ambient temperature. Two kinds of flanges were studied: Type I, a flat lip with a rounded heel and instep, and Type VI, a conical lip with a rounded heel. The 14,500-psi, short-term critical pressure for hemispherical windows with t/Ri=0.364 was found to be...

Topics: DTIC Archive, Stachiw, J. D., Sletten, R., CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CA, *ACRYLIC...

This paper discusses the effect of an opening at the pole of a hemispherical shaped-charge liner. An experimental study was performed in which various diameter holes were made in otherwise similar shaped-charge liners. Flash radiographs were taken to observe changes in the liner collapse and the jet characteristics. The collapse process and jet characteristics of a hemispherical liner are significantly altered for a hole diameter which is 10% or more of the outer liner diameter. The jet tip...

Topics: DTIC Archive, Summers, R L, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *SHAPED CHARGE...

Some preliminary results are given on the generation of implosion waves by simultaneously detonating a hemispherical shell of sheet explosive at 91 individual initiation sites. The 7 in. dia. x 0.168 in. thick shell was formed from eight 'orange-peel' segments cemented on a steel backing shell 0.1 in. thick, which was perforated to take the 91 detonators. A scalloped type shock wave surface was generated from the 91 individual detonation sites that imploded into the gas space. The distortions...

Topics: DTIC Archive, Kennedy, Jack E, TORONTO UNIV DOWNSVIEW (ONTARIO) INST FOR AEROSPACE STUDIES,...

The report summarizes results during the period 1July through 30 September 30 1970: Measurements of dynamic loads on an explosive forming die; application of explosive welding to hardware configurations; flange buckling of explosively formed domes; cylindrical explosive forming dies; explosive forming of domes in vented dies; explosive forming of domes for ground based pressure vessels; the edge pull-in of explosively formed domes; fracture toughness of explosively formed high strength steels;...

Topics: DTIC Archive, Mote, Jimmy D, MARTIN MARIETTA AEROSPACE DENVER CO CENTER FOR HIGH ENERGY FORMING,...

A theoretical analysis of the turbulent wake behind a body of revolution has been made, and an equation for the velocity distribution in the wake has been found in terms of four constants which are determined from experiments. Measurements of the velocity distribution in the wake behind twelve bodies of revolution are presented, and the four constants for each body are derived. A generalization of the empirical constants in terms of body drag coefficient is made. Calculations using the...

Topics: DTIC Archive, Heinrich, Helmut G, MINNESOTA UNIV MINNEAPOLIS, *BODIES OF REVOLUTION, *WAKE, THEORY,...

A stiffened steel hemisphere with a nominal yield strength of 150,000 psi was designed, fabricated, and tested to explore the structural efficiency of stiffened spherical shells. Test results show that the collapse pressure was approximately 30 percent greater than that predicted for an unstress-relieved, monocoque shell of equivalent weight with the same out of roundness. The collapse pressure approached that of a near-perfect, machined spherical shell. Thus, it appears that the detrimental...

Topics: DTIC Archive, Schwartz, Frank M, DAVID TAYLOR MODEL BASIN WASHINGTON DC STRUCTURAL MECHANICS LAB,...

The objective of this contract was to provide services on a task assignment basis for the investigation of the operational analysis of applying suppressive shields to a variety of special case problems, operating problems, design hardware solutions and provide standard operating procedures in connection with the installation and maintenance of suppressive shields in specific plants. This report presents a summary of the results of the ten tasks assigned under the contract. (Author)

Topics: DTIC Archive, AAI CORP COCKEYSVILLE MD, *SHIELDING, *RESEARCH MANAGEMENT, *HARDENED STRUCTURES,...

An experimental investigation of the test section flow blockage characteristics was conducted at Mach 4 in the High Temperature Hypersonic Gas dynamics Facility. The models utilized in this program were pointed and blunted cones from 5 degree half angle to 90-degree half angle, flat plates, delta winged shapes, and hemispherical models, some of which were run up to 40-degree angle of attack. Comparison of the data with other facilities resulted in a correlation of the maximum model size...

Topics: DTIC Archive, Czysz, Paul A, AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH DIRECTORATE OF...

A new finite element is described for performing detailed thermal stress analysis of thin orthotropic shells of revolution. The element provides for temperature loadings which may vary over the surface of the shell as well as through the thickness. In a number of sample calculations, results from the present method are compared with analytical solutions as well as with independent numerical analyses. Such calculations are carried out for two cylinders, a conical frustum, a truncated hemisphere,...

Topics: NASA Technical Reports Server (NTRS), BODIES OF REVOLUTION, FINITE ELEMENT METHOD, ORTHOTROPIC...

The combined effects of ideal source flow and viscous interaction on the pressure and heat-transfer distributions over hemisphere-cylinders are presented, and a comparison is made with experimental data from two of the AEDC- VKF hotshot tunnels. Ideal gas characteristics solutions for the inviscid flow field over the hemisphere-cylinders were obtained for ideal source flow fields matched to the tunnel geometry. The inviscid and viscous (laminar boundary layer) flow fields were iterated, and the...

Topics: DTIC Archive, Eaves, Jr , R H, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *HYPERSONIC...

Data from 18 wind tunnel and free flight tests on heat transfer to blunt cones and hemispheres are correlated with simple theoretical formulae. The Mach number and Reynolds number ranges for these tests are from 1.33 to 10.2 and 8 x 10 to the 2nd power to 4.5 x 10 to the 7th power, respectively. The blunt cone models have semiangles between 4.75 and 15 degrees and nose to base radius ratios between 0.125 and 0.8. For the free flight tests, estimates of the error in measured heat transfer...

Topics: DTIC Archive, Seel, M W, BRISTOL AIRCRAFT LTD (UNITED KINGDOM), *HEMISPHERICAL SHELLS, *CONICAL...