43 Matching Results

Search Results

Advanced search parameters have been applied.

A Theoretical Study of the Effect of Upstream Transpiration Cooling on the Heat-Transfer and Skin-Friction Characteristics of a Compressible, Laminar Boundary Layer

Description: Note presenting an analysis which predicts the skin-friction and heat-transfer characteristics of a compressible, laminar boundary layer on a solid flat plate preceded by a porous section that is transpiration cooled. The analysis is restricted to a Prandtl number of unity and linear variation of viscosity with temperature. Results regarding a comparison of polynomial and exact velocity distribution, skin friction, heat transfer, and some practical implications of results are provided.
Date: May 1957
Creator: Rubesin, Morris W. & Inouye, Mamoru
Partner: UNT Libraries Government Documents Department

A Mach 4 rocket-powered supersonic tunnel using ammonia-oxygen as working fluid

Description: From Summary: "A rocket-powered supersonic tunnel has been constructed to simulate the high heating rates encountered in hypersonic flow. A gas temperature of 4500 degrees Rankine at Mach 4 has been produced in the 15-inch test section of the tunnel. The calibration pressure data indicate reproducibility of test conditions in this facility. Physical, transport, and one-dimensional aerodynamic data from combustion products of ammonia and oxygen are included."
Date: September 1958
Creator: Graham, Robert W.; Guentert, Eleanor Costilow & Huff, Vearl N.
Partner: UNT Libraries Government Documents Department

Measurements of total hemispherical emissivity of various oxidized metals at high temperature

Description: Report presenting the results of measurements of total hemispherical emissivity at high temperatures for various metals are presented together with a limited description of the equipment and procedures used. Results regarding stainless steel, mild steel, titanium alloy, titanium, copper, aluminum, molybdenum, and tantalum are provided.
Date: March 1958
Creator: Wade, William R.
Partner: UNT Libraries Government Documents Department

Experimental and theoretical determination of thermal stresses in a flat plate

Description: Report determining the thermal stresses induced in a flat, rectangular, 75S-T6 aluminum-alloy plate by nonuniform heating both experimentally and theoretically. Results regarding the temperature distribution, longitudinal direct stresses, shear stresses, transverse direct stresses, and agreement between theory and experiment are provided.
Date: August 1952
Creator: Heldenfels, Richard R. & Roberts, William M.
Partner: UNT Libraries Government Documents Department

The temperature of unheated bodies in a high-speed gas stream

Description: From Summary: "The present report deals with temperature measurements on cylinders of 0.2 to 3 millimeters diameter in longitudinal and transverse air flow at speeds of 100 to 300 meters per second. Within the explored test range, that is, the probable laminar boundary layer region, the temperature of the cylinders in axial flow is practically independent of the speed and in good agreement with Pohlhausen's theoretical values; Whereas, in transverse flow, cylinders of certain diameter manifest a close relationship with speed, the ratio of the temperature above the air of the body to the adiabatic stagnation temperature decreases with rising speed and then rises again from a Mach number of 0.6. The importance of this "specific temperature" of the body for heat-transfer studies at high speed is discussed."
Date: December 1941
Creator: Eckert, E. & Weise, W.
Partner: UNT Libraries Government Documents Department

Theory of aircraft structural models subject to aerodynamic heating and external loads

Description: Report examining the problem of investigating the simultaneous effects of transient aerodynamic heating and external loads on aircraft structures for the purpose of determining the ability of the structure to withstand flight to supersonic speeds.
Date: September 1957
Creator: O'Sullivan, William J., Jr.
Partner: UNT Libraries Government Documents Department

Motion of a ballistic missile angularly misaligned with the flight path upon entering the atmosphere and its effect upon aerodynamic heating, aerodynamic loads, and miss distance

Description: From Summary: "An analysis is given of the oscillating motion of a ballistic missile which upon entering the atmosphere is angularly misaligned with respect to the flight path. The history of the motion for some example missiles is discussed from the point of view of the effect of the motion on the aerodynamic heating and loading. The miss distance at the target due to misalignment and to small accidental trim angles is treated. The stability problem is also discussed for the case where the missile is tumbling prior to atmospheric entry."
Date: October 1957
Creator: Allen, H. Julian
Partner: UNT Libraries Government Documents Department

Heat-transfer and pressure measurements on flat-faced cylinders at a Mach number of 2

Description: Report presenting flat-faced cylinders tested at Mach number 2 and sea-level conditions in the preflight jet. Both pressure distributions and heat-transfer rates were measured. Results regarding pressure measurements and heat-transfer measurements are provided.
Date: July 1958
Creator: Stoney, William E., Jr. & Markley, J. Thomas
Partner: UNT Libraries Government Documents Department

An analysis of supersonic aerodynamic heating with continuous fluid injection

Description: From Introduction: "The aerodynamic heating problem assumes considerable importance at high-supersonic speeds. Sanger and Bredt (reference 1) have calculated the high-speed aerodynamic forces and equilibrium surface temperature at extremely high altitudes where the molecular mean free path is large (free-molecule-flow region) compared with a characteristic body dimension. The theoretical investigation of Lees (reference 2) on the stability of the laminar boundary layer in compressible flow indicates that the laminar boundary layer is completely stable at all Reynolds numbers at supersonic speeds for a sufficiently low ratio of surface temperature to stream temperature."
Date: September 29, 1949
Creator: Klunker, E. G. & Ivey, H. Reese
Partner: UNT Libraries Government Documents Department

Preliminary Investigation of Graphite, Silicon Carbide, and Several Polymer-Glass-Cloth Laminates in a Mach Number 2 Air Jet at Stagnation Temperatures of 3,000 F and 4,000 F

Description: Memorandum presenting testing of several materials including graphite, silicon carbide, and a number of polymer-glass-cloth laminated constructions at temperatures of 3,000 and 4,000 degrees Fahrenheit in a laboratory-scale ceramic-heated air jet. The tests were made to utilize four possible mechanisms for the alleviation of the aerodynamic-heating problem of hypersonic aircraft, which included radiative heat transfer, pyrolysis, fusion, and mass-transfer cooling by ablation.
Date: January 9, 1958
Creator: Casey, Francis W., Jr. & Hopko, Russell N.
Partner: UNT Libraries Government Documents Department

Use of Aerodynamic Heating to Provide Thrust by Vaporization of Surface Coolants

Description: Note presenting an analysis of the propulsive thrust and specific impulse attainable by cooling aircraft surfaces with liquefied or solidified gases with vaporization temperatures lower than the equilibrium surface temperature. Use of coolant vaporization as the sole means of propulsion yields low specific impulses at low speeds.
Date: February 1954
Creator: Moeckel, W. E.
Partner: UNT Libraries Government Documents Department

Transient Temperature Distribution in a Two-Component Semi-Infinite Composite Slab of Arbitrary Materials Subjected to Aerodynamic Heating With a Discontinuous Change in Equilibrium Temperature or Heat-Transfer Coefficient

Description: Report presenting a solution to the transient temperature distribution in a semi-infinite two-component composite slab of arbitrary materials subjected to an instantaneous application of aerodynamic heating. Results regarding some general principles and an illustrative example are provided.
Date: September 1958
Creator: Trimpi, Robert L. & Jones, Robert A.
Partner: UNT Libraries Government Documents Department

Calculation of surface temperatures in steady supersonic flight

Description: Report presenting the calculation of surface temperatures for bodies in steady supersonic flight at Mach numbers from 2 to 10, altitudes from 50,000 to 200,000 feet, and emissivites from 0 to 1. The importance of the effects of radiation and convection was determined. Some suggestions for further research into unsolved problems are also provided.
Date: December 1946
Creator: Wood, George P.
Partner: UNT Libraries Government Documents Department

Heat-transfer measurements on two bodies of revolution at a Mach number of 3.12

Description: Report presenting local rates of heat transfer obtained from a parabolic-nosed cylinder at Mach number 3.12. The laminar-heat-transfer coefficients obtained from the conical portion of the cone cylinder were found to agree closely with theory at all temperature levels when corrected for the axial temperature distribution.
Date: October 1956
Creator: Jack, John R. & Diaconis, N. S.
Partner: UNT Libraries Government Documents Department

Effects of extreme surface cooling on boundary-layer transition

Description: Report presenting an investigation to determine the combined effects of surface cooling, pressure gradient, nose blunting, and surface finish on boundary-layer transition. Data were obtained for various body shapes at Mach number 3.12 and a variety of Reynolds numbers. Results regarding the effect of extreme cooling, effect of pressure gradient, effect of blunting, effect of surface roughness, and roughness as case of transition reversal are provided.
Date: October 1957
Creator: Jack, John R.; Wisniewski, Richard J. & Diaconis, N. S.
Partner: UNT Libraries Government Documents Department

A method for simulating the atmospheric entry of long-range ballistic missiles

Description: From Summary: "It is demonstrated with the aid of similitude arguments that a model launched from a hypervelocity gun upstream through a special supersonic nozzle should experience aerodynamic heating and resulting thermal stresses like those encountered by a long-range ballistic missile entering the earth's atmosphere. This demonstration hinges on the requirements that model and missile be geometrically similar and made of the same material, and that they have the same flight speed and Reynolds number (based on conditions just outside the boundary layer) at corresponding points in their trajectories. The hypervelocity gun provides the model with the required initial speed, while the nozzle scales the atmosphere, in terms of density variation, to provide the model with speeds and Reynolds numbers over its entire trajectory."
Date: December 28, 1955
Creator: Eggers, A. J., Jr.
Partner: UNT Libraries Government Documents Department

A method for simulating the atmospheric entry of long-range ballistic missiles

Description: From Summary: "It is demonstrated with the aid of similitude arguments that a model launched from a hypervelocity gun upstream through a special supersonic nozzle should experience aerodynamic heating and resulting thermal stresses like those encountered by a long-range ballistic missile entering the earth's atmosphere. This demonstration hinges on the requirements that model and missile be geometrically similar and made of the same material, and that they have the same flight speed and Reynolds number (based on conditions just outside the boundary layer) at corresponding points in their trajectories. The hypervelocity gun provides the model with the required initial speed, while the nozzle scales the atmosphere, in terms of density variation, to provide the model with speeds and Reynolds numbers over its entire trajectory."
Date: September 15, 1955
Creator: Eggers, A. J., Jr.
Partner: UNT Libraries Government Documents Department

A study of the motion and aerodynamic heating of ballistic missiles entering the earth's atmosphere at high supersonic speeds

Description: From Summary: "A simplified analysis of the velocity and deceleration history of ballistic missiles entering the earth's atmosphere at high supersonic speeds is presented. The results of this motion analysis are employed to indicate means available to the designer for minimizing aerodynamic heating. The heating problem considered involves not only the total heat transferred to a missile by convection, but also the maximum average and local time rates of convective heat transfer."
Date: April 28, 1953
Creator: Allen, H. Julian & Eggers, A. J., Jr.
Partner: UNT Libraries Government Documents Department

Experimental investigation of the simulation of atmospheric entry of ballistic missiles

Description: Report presenting a small-scale apparatus for simulating the motion and heating of ballistic missiles and its elements of design and operation. Experiments demonstrate that conditions for simulation are fulfilled according to theoretical requirements. Results regarding the application to full-scale missiles, shadowgraph observations, observations of recovered models, and spectroscopic observations are provided.
Date: December 12, 1957
Creator: Neice, Stanford E.; Carson, James A. & Cunningham, Bernard E.
Partner: UNT Libraries Government Documents Department

The Effects of Aerodynamic Heating on Ice Formations on Airplane Propellers

Description: Report presenting an investigation of the effect of aerodynamic heating on propeller-blade temperatures and its relation to propeller icing. Test results indicate that the outermost station at which ice formed on a propeller blade as determined by the blade temperature rise resulting from the aerodynamic heating at that point.
Date: March 1941
Creator: Rodert, Lewis A.
Partner: UNT Libraries Government Documents Department

Transient temperature distributions in simple conducting bodies steadily heated through a laminar boundary layer

Description: "An analysis is made of the transient heat-conduction effects in three simple semi-infinite bodies: the flat insulated plate, the conical shell, and the slender solid cone. The bodies are assumed to have constant initial temperatures and, at zero time, to begin to move at a constant speed and zero angle of attack through a homogeneous atmosphere. The heat input is taken as that through a laminar boundary layer. Radiation heat transfer and transverse temperature gradients are assumed to be zero" (p. 1).
Date: December 1953
Creator: Parker, Hermon M.
Partner: UNT Libraries Government Documents Department

Comparison of Theoretical and Experimental Heat-Transfer Characteristics of Bodies of Revolution at Supersonic Speeds

Description: "An investigation of the three important factors that determine convective heat-transfer characteristics at supersonic speeds, location boundary-layer transition, recovery factor, and heat-transfer parameter has been performed at Mach numbers from 1.49 to 1.18. The bodies of revolution that were tested had, in most cases, laminar boundary layers, and the test results have been compared with available theory. Boundary-layer transition was found to be affected by heat transfer" (p. 1301).
Date: December 17, 1948
Creator: Scherrer, Richard
Partner: UNT Libraries Government Documents Department

The Effects of Aerodynamic Heating and Heat Transfer on the Surface Temperature of a Body of Revolution in Steady Supersonic Flight

Description: Note presenting an approximate method for determining the convective cooling requirement in the laminar boundary layer region of a body of revolution in high-speed flight that was developed and applied to a sample body. The convective cooling requirements were found to be small for the range of Mach numbers considered, but increased rapidly with increasing Mach number.
Date: July 1947
Creator: Scherrer, Richard
Partner: UNT Libraries Government Documents Department

The Effects of Aerodynamic Heating and Heat Transfer on the Surface Temperature of a Body of Revolution in Steady Supersonic Flight

Description: "An approximate method for determining the convective cooling requirement in the laminar boundary-layer region of a body of revolution in high-speed flight was developed and applied to an example body. The cooling requirement for the example body was determined as a function of Mach number, altitude, size, and a surface-temperature parameter. The maximum value of Mach number considered was 3.0 and the altitudes considered were those within the lower constant-temperature region of the atmosphere (40,000 to 120,000 ft.)" (p. 463).
Date: October 14, 1946
Creator: Scherrer, Richard
Partner: UNT Libraries Government Documents Department