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327 Matching Results
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Analysis of stresses and deflections in a disk subjected to gyroscopic forces
From Summary: "Results are presented in dimensionless form suitable for design purposes. The method for solving the problem of a disk of variable thickness with a temperature gradient is also presented."
Date:
March 1958
Creator:
Hirschberg, M. H. & Mendelson, A.
System:
The UNT Digital Library
An Analysis of the Optimization of a Beam Rider Missile System
"The paper begins with a discussion of the optimum system and the corresponding minimum error. A brief discussion of this miss as a function of the parameters which determine it is then given" (p. 2).
Date:
March 1958
Creator:
Shinbrot, Marvin & Carpenter, Grace C.
System:
The UNT Digital Library
Application of a high-temperature static strain gage to the measurement of thermal stresses in a turbine stator vane
From Introduction: "This report describes the high-temperature static strain gage and presents the results obtained in a determination of the thermal stresses in a turbine stator vane resulting from the temperature distribution obtained under steady-state conditions at rated speed and temperature of the engine."
Date:
March 1958
Creator:
Kemp, R. H.; Morse, C. R. & Hirschberg, M. H.
System:
The UNT Digital Library
Approximations for the thermodynamic and transport properties of high-temperature air
Report presenting the thermodynamic and transport properties of high-temperature air in closed form starting from approximate partition functions for the major components in air and neglecting all minor components. The compressibility, energy, entropy, specific heats, speed of sound, coefficients of viscosity and thermal conductivity, and Prandtl numbers for air are provided for a range of temperatures and pressures.
Date:
March 1958
Creator:
Hansen, C. Frederick
System:
The UNT Digital Library
Drop-size distributions for impinging-jet breakup in airstreams simulating the velocity conditions in rocket combustors
Report presenting drop-size-distribution data obtained for heptane sprays produced by pairs of impinging jets in airstreams over ranges of orifice diameter, liquid-jet velocity, and velocity difference between the airstream and the liquid jet.
Date:
March 1958
Creator:
Ingebo, Robert D.
System:
The UNT Digital Library
Effect of a stringer on the stress concentration due to a crack in a thin sheet
From Summary: "A coefficient is obtained for determining the effect of reinforcing stringer on the stress concentration factor at the tip of a crack in a thin sheet. The results are given for the case in which the stringer is intact and for the case in which the stringer is broken. In the first case the stress concentration factor for the stringer is also given."
Date:
March 1958
Creator:
Sanders, J. Lyell, Jr.
System:
The UNT Digital Library
Effect of jet temperature on jet-noise generation
Report presenting an experimental investigation in order to determine the effect of jet temperature on jet-noise generation. Jet pressure ratios from 1.3 to 1.9 and temperature from 80 to 1000 degrees Fahrenheit. Results showed that sound power can be adequately predicted by the Lighthill parameter based on ambient temperature over the range of temperatures investigated.
Date:
March 1958
Creator:
Rollin, Vern G.
System:
The UNT Digital Library
Effect of overheating on creep-rupture properties of M-252 alloy
Report presenting a study on the influence of periodic overheats of 2-minutes duration to four different temperatures on the creep-rupture properties of M-252 alloy at 1500 degrees Fahrenheit. The purpose of the study was to provide information regarding the estimation of the effects of overheating on creep-rupture performance of gas-turbine parts. Results regarding normal rupture properties of experimental materials, overheats on heat HT-28, overheats on heats 837 and 43642, comparative effects of overheating on S-816, HS-31, and M-252 alloys, mechanism of damage from overheating, interpretation of results in terms of overheating in a turbine, and some limitations of results are provided.
Date:
March 1958
Creator:
Rowe, John P. & Freeman, J. W.
System:
The UNT Digital Library
Effect of Wall Cooling on Inlet Parameters of a Scoop Operating in a Turbulent Boundary Layer on a Flat or Conical Surface for Mach Numbers 2 to 10
Note presenting analytical results obtained for boundary-layer mass flow, momentum, total-temperature, and total-pressure recovery ratios of a scoop inlet with a height equal to the boundary-layer thickness and operating in a turbulent boundary layer, for flat and conical surfaces with wall cooling. The results indicate that design of boundary-layer intake devices or diverters must reflect the effects of wall cooling by either variable or compromised size.
Date:
March 1958
Creator:
Beke, Andrew
System:
The UNT Digital Library
Measurements of total hemispherical emissivity of various oxidized metals at high temperature
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.
System:
The UNT Digital Library
A Method for the Calculation of Wave Drag on Supersonic-Edged Wings and Biplanes
"A method is presented for finding the lift, moment, and drag on three-dimensional wings or biplanes with supersonic edges and a straight trailing edge normal to the free stream. The minimum wave drag for fixed lift or volume is given for several special cases. Simple applications of the method may provide some measure of the degree to which more abstract method for finding minima can be relied upon as a measure of optimum real systems" (p. 1).
Date:
March 1958
Creator:
Lomax, Harvard & Sluder, Loma
System:
The UNT Digital Library
Prandtl-Meyer expansion of chemically reacting gases in local chemical and thermodynamic equilibrium
"It is found that Prandtl-Meyer flow, in which chemical reactions are occurring and are in equilibrium, can be simply and exactly calculated. The property of air which governs the flow is found to be a quantity which depends only on the ratio of enthalpy to the square of the speed of sound; the analogous quality for an inert gas depends only on the ratio of specific heats. the maximum angle through which the flow may turn is generally larger when chemical reactions are occurring than it is in nonreacting air" (p. 1).
Date:
March 1958
Creator:
Heims, Steve P.
System:
The UNT Digital Library
Pressure distributions at transonic speeds for parabolic-arc bodies of revolution having fineness ratios of 10, 12, and 14
From Summary: "The measured static-pressure distributions at the model surfaces and in the surrounding flow field are presented for parabolic-arc bodies of revolution having fineness ratios of 10, 12, and 14. The data were obtained with the various bodies at zero angle of attack. The Mach number varied from 0.80 to 1.20, and Reynolds number varied from approximately 23.4 x 10(exp 6) to 28.6 x 10(exp 6) (based on the theoretical length of the model from nose to point of closure)."
Date:
March 1958
Creator:
Taylor, Robert A. & McDevitt, John B.
System:
The UNT Digital Library
Propellant vaporization as a criterion for rocket engine design; Relation between percentage of propellant vaporized and engine performance
Report presenting an anakysis of the quantitative effect of incomplete propellant vaporization on rocket-engine performance. Results regarding the effect of incomplete vaporization on engine performance and an interpretation of experimental data are provided.
Date:
March 1958
Creator:
Heidmann, Marcus F. & Priem, Richard J.
System:
The UNT Digital Library
Skin-friction measurements in incompressible flow
Report presenting experiments conducted to measure in incompressible flow the local surface-shear stress and average skin-friction coefficient for a turbulent boundary layer on a smooth, flat plate with zero pressure gradient. Local velocity measurements and local surface-shear measurements were taken and a sensitive manometer was used.
Date:
March 1958
Creator:
Smith, Donald W. & Walker, John H.
System:
The UNT Digital Library
Transient Heating Effects on the Bending Strength of Integral Aluminum-Alloy Box Beams
Note describing tests of twenty-five square-tube beams made of aluminum alloy under various combinations of bending moment and transient heating. Two types of heat input were used so that the effect of thermal stresses could be separated from effects of material properties. Two sizes of square tubes were tested so that both elastic and plastic buckling stresses would be obtained.
Date:
March 1958
Creator:
Pride, Richard A. & Hall, John B., Jr.
System:
The UNT Digital Library
Wall Pressure Fluctuations in a Turbulent Boundary Layer
Note presenting an investigation of sound generation that is generated by turbulence on a solid surface. Suitable equipment has been developed to measure the fluctuating wall pressure in the turbulent boundary layer. Results regarding the response of the transducer in a laminar and turbulent boundary layer, power-spectrum measurements, and mean-square pressure measurements are provided.
Date:
March 1958
Creator:
Willmarth, William W.
System:
The UNT Digital Library
Comparison of NACA 65-series compressor-blade pressure distributions and performance in a rotor and in cascade
An investigation has been conducted to compare the performance of NACA 65-series compressor blades in two-dimensional cascade with that in an axial flow compressor. Blade pressure distributions were obtained by the use of a mercury-seal pressure-transfer device. The comparison indicated that cascade data accurately predicted the turning angle and blade pressure distribution obtained in the compressor at design conditions.
Date:
March 1957
Creator:
Westphal, Willard R. & Godwin, William R.
System:
The UNT Digital Library
A comparison of typical National Gas Turbine Establishment and NACA axial-flow compressor blade sections in cascade at low speed
Report presenting comparative low-speed cascade tests of the National Gas Turbine Establishment of Great Britain axial-flow compressor blade sections at a range of air-inlet angles and a solidity of 1.0 using the porous wall technique. Results regarding a comparison of performance characteristics of the NGTE and NACA axial-flow compressor blade sections and a comparison of NGTE and NACA low-speed cascade tests of the NGTE 10C4/30C50 section are provided.
Date:
March 1957
Creator:
Felix, A. Richard & Emery, James C.
System:
The UNT Digital Library
A correlation of low-speed, airfoil-section stalling characteristics with Reynolds number and airfoil geometry
From Summary: "The low-speed stalling characteristics of a large number of airfoil sections have been correlated with Reynolds number and a single airfoil ordinate near the leading edge as the correlation parameters. The correlation is appropriate only to airfoils without high-lift devices in flows of very low turbulence and with aerodynamically smooth surfaces."
Date:
March 1957
Creator:
Gault, Donald E.
System:
The UNT Digital Library
The erosion of meteors and high-speed vehicles in the upper atmosphere
From Summary: "A simple inelastic collision model of meteor-atmosphere interaction is used and analytic relations for velocity, deceleration, size, and relative luminous magnitude of meteors are derived and expressed in dimensionless parametric form. The analysis is compared with available quantitative observations of meteor behavior and it is indicated that a large fraction of the atmospheric bombardment energy is used in eroding meteor material. The erosion from large, high-speed vehicles as they traverse the high-altitude, free-molecule portion of the atmosphere is calculated, on the assumption that the vaporization process is similar to that which occurs for meteors."
Date:
March 1957
Creator:
Hansen, C. Frederick
System:
The UNT Digital Library
Experimental Comparison of Speed: Fuel-Flow and Speed-Area Controls on a Turbojet Engine for Small Step Disturbances
Optimum proportional-plus-integral control settings for speed - fuel-flow control, determined by minimization of integral criteria, correlated well with analytically predicted optimum settings. Engine response data are given for a range of control settings around the optimum. An inherent nonlinearity in the speed-area loop necessitated the use of nonlinear controls. Response data for two such nonlinear control schemes are presented.
Date:
March 1957
Creator:
Wenzel, L. M.; Hart, C. E. & Craig, R. T.
System:
The UNT Digital Library
Experimental Investigation of Temperature Feedback Control Systems Applicable to Turbojet-Engine Control
Temperature - fuel-flow and temperature-area feedback control systems were investigated as means of controlling tailpipe gas temperature of a turbojet engine during transient operation in the high-speed region. Proportional-plus-integral control was used in both systems, but in the temperature-area control system it was necessary to add nonlinear components to the basic proportional-plus-integral control to provide satisfactory transient response to a desired step increase in temperature. Time integral of temperature-error functions were used as criteria for determining optimum transient response.
Date:
March 1957
Creator:
Hart, C. E.; Wenzel, L. M. & Craig, R. T.
System:
The UNT Digital Library
Experimental investigation of the forces and moments due to sideslip of a series of triangular vertical- and horizontal-tail combinations at Mach numbers of 1.62, 1.93, and 2.41
Report presenting an experimental investigation at three Mach numbers of a series of tail combinations consisting of a triangular vertical tail attached symmetrically to a triangular horizontal tail to determine the lateral force, yawing moment, and rolling moment due to sideslip. The results indicated that the lateral-force derivative and yawing-moment derivative were predicted satisfactorily with the method used with the exception of when leading edges approach a sonic condition.
Date:
March 1957
Creator:
Coletti, Donald E.
System:
The UNT Digital Library