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111
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1,172 Matching Results
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Heat Transfer in Isotropic Turbulence During the Final Period of Decay
Note presenting a consideration of the problem of heat transfer in isotropic turbulence with a constant mean temperature gradient during the final period of decay. The temperature field is ultimately found to become independent of the initial conditions on the temperature and have characteristics determined only by the mean temperature gradient, the physical properties of the fluid, and the characteristics of the turbulence.
Date:
June 1958
Creator:
Dunn, D. W. & Reid, W. H.
Object Type:
Report
System:
The UNT Digital Library
A fuselage addition to increase drag-rise Mach number of subsonic airplanes at lifting conditions
Report presenting an investigation of the addition of fuselage volume on top of the forward portion of a fuselage for the purpose of increasing drag-rise Mach number of subsonic airplanes at lifting conditions. The addition increased the drag-rise Mach number by approximately 0.03 for a configuration with a wing of moderate thickness and 35 degrees of sweepback at a lift coefficient of 0.3. Results regarding drag characteristics and lift and pitching-moment characteristics are provided.
Date:
June 1958
Creator:
Whitcomb, Richard T.
Object Type:
Report
System:
The UNT Digital Library
Normal component of induced velocity for entire field of a uniformly loaded lifting rotor with highly swept wake as determined by electromagnetic analog
Report presenting values of the nondimensional normal component of induced velocity throughout the flow field of a uniformly loaded lifting rotor operating in the upper half of the helicopter speed range in the form of graphs and tables. The results obtained should be useful for estimating the induced velocity distribution about lifting rotors in general and for synthesizing the distributions over the rotor disk for the case of any specified non-uniform loading.
Date:
June 1958
Creator:
Castles, Walter, Jr.; Durham, Howard L., Jr. & Kevorkian, Jirair
Object Type:
Report
System:
The UNT Digital Library
An experimental study of the turbulent boundary layer on a shock-tube wall
From Summary: "Interferometric measurements were made of the density profiles of an unsteady turbulent boundary layer on the flat wall of a shock tube. The investigation included both subsonic and supersonic flow (Mach numbers of 0.50 and 1.77) with no pressure gradient and with heat transfer to a cold wall. Velocity profiles and average skin-friction coefficients were calculated. Effects on the velocity profile of surface roughness and flow lengths are examined."
Date:
June 1958
Creator:
Gooderum, Paul B.
Object Type:
Report
System:
The UNT Digital Library
On Solutions for the Transient Response of Beams
Note presenting Williams type modal solutions of the elementary and Timoshenko beam equations for the transient response of several uniform beams to a general applied load. Example computations are shown for a free-free beam subject to various concentrated loads at its center. Results regarding modal solutions, the need for Timoshenko's theory, and numerical solutions are provided.
Date:
June 1958
Creator:
Leonard, Robert W.
Object Type:
Report
System:
The UNT Digital Library
Exploratory Wind-Tunnel Investigation to Determine the Lift Effects of Blowing over Flaps from Nacelles Mounted Above the Wing
"An exploratory wind-tunnel investigation has been made to determine the lift effects of blowing from nacelles over the upper surface of flaps on a model having a delta wing of aspect ratio 3. Several flap conditions were examined. High-pressure air was blown from an external-pipe arrangement supported above the wing to simulate jet-engine exhaust. The jet momentum- coefficient range was from 0 to 3.0 and the model angle of attack was 0 degrees" (p. 1).
Date:
June 1958
Creator:
Riebe, John M. & Davenport, Edwin E.
Object Type:
Report
System:
The UNT Digital Library
Application of statistical theory to beam-rider guidance in the presence of noise 2: modified Wiener filter theory
Report presenting a study of the application of Newton's modification of the Wiener filter theory to optimize a beam-rider guidance system operating in the presence of glint noise.
Date:
June 1958
Creator:
Stewart, Elwood C.
Object Type:
Report
System:
The UNT Digital Library
Boundary-Induced Downwash Due to Lift in a Two-Dimensional Slotted Wind Tunnel
Note presenting a solution obtained for the complete tunnel-interference flow for a lifting vortex in a two-dimensional slotted tunnel. Curves are presented for the longitudinal distribution of tunnel-induced downwash angle for various values of boundary openness parameter and various heights of the vortex above the tunnel center line.
Date:
June 1958
Creator:
Katzoff, S. & Barger, Raymond L.
Object Type:
Report
System:
The UNT Digital Library
Internal characteristics and performance of several jet deflectors at primary-nozzle pressure ratios up to 3.0
Report presenting testing of several model jet deflectors to determine the effects of design variables on their performance and operating characteristics. The deflectors were designed to be adaptable to convergent-nozzle, plug-nozzle, and ejector turbojet exhaust systems. Results regarding the swiveled-nozzle jet deflectors, auxiliary-nozzle jet deflectors, mechanical jet deflectors, and miscellaneous jet deflectors are provided.
Date:
June 1958
Creator:
McArdle, Jack G.
Object Type:
Report
System:
The UNT Digital Library
Studies of OH, CO, CH, and Câ‚‚ Radiation From Laminar and Turbulent Propane-Air and Ethylene-Air Flames
Note presenting an analysis of OH, CO, CH and C(sub 2) radiations from propane-air and ethylene-air flames isolated with a monochromator, and purification of the OH, CH, and C(sub 2) emitters by subtracting the unwanted CO background. The changes in intensity with changing equivalence ratio were determined for each emitter. Results regarding the variation of radiation equivalence ratio in the flame column and variation of emitter intensity with fuel-flow rate and Reynolds number are also provided.
Date:
June 1958
Creator:
Clark, Thomas P.
Object Type:
Report
System:
The UNT Digital Library
Some Aspects of Fail-Safe Design of Pressurized Fuselages
"Separate investigations have dealt with the critical crack length of flat sheets or of unstiffened cylinders and with the type of rupture experienced by stiffened cylinders. These investigations are correlated, supplemented by new tests, and combined into a uniform scheme for predicting critical crack length and type of rupture in stiffened pressurized cylinders" (p. 1).
Date:
June 1957
Creator:
Kuhn, Paul & Peters, Roger W.
Object Type:
Report
System:
The UNT Digital Library
Some Research Results on Sandwich Structures
"The results of compressive-buckling tests of steel sandwich plates are given, and the significant parameters which affect the strength of the plates are discussed. The various types of sandwich construction are shown to be comparable on a weight-strength basis with conventional high-strength aluminum-alloy construction" (p. 1).
Date:
June 1957
Creator:
Anderson, Melvin S. & Updegraff, Richard G.
Object Type:
Report
System:
The UNT Digital Library
Theoretical and Experimental Investigations of Delta-Wing Vibrations
Note presenting the results of some theoretical and experimental investigations of delta-wing vibrations. Experimental nodal-line patterns and frequencies for a 60 degree thick-skin delta wing are shown. Comparisons of the different investigations have shown that the idealized-strucutre type of method as proposed by Levy gives excellent results for thin-skin wings provided that corrections are made for the effects of transverse shear.
Date:
June 1957
Creator:
Kruszewski, Edwin T.; Kordes, Eldon E. & Weidman, Deene J.
Object Type:
Report
System:
The UNT Digital Library
Some effects of joint conductivity on the temperatures and thermal stresses in aerodynamically heated skin-stiffener combinations
Report presenting an analysis of temperatures and thermal stresses in typical skin-stiffener combinations of winglike structures subjected to aerodynamic heating using an electronic differential analyzer. Variations were made in aerodynamic heat-transfer parameter, in a joint conductivity parameter, and in the ratio of skin width to skin thickness. Results regarding data obtained,an illustrative example, temperature and stress ratios, and peak stress ratios and temperature-ratio drop across joint are provided.
Date:
June 1956
Creator:
Griffith, George E. & Miltonberger, Georgene H.
Object Type:
Report
System:
The UNT Digital Library
Measurements of atmospheric turbulence over a wide range of wavelength for one meteorological condition
Report presenting a method for obtaining a power spectrum of gust vertical velocity over a wide range of wavelengths from simultaneous measurements in flight. It has the advantage of not involving the use of airplane transfer functions. Results regarding the measurements of velocity, including long-period and short-period measurements, and a composite spectrum over the range of frequencies are provided.
Date:
June 1956
Creator:
Crane, Harold L. & Chilton, Robert G.
Object Type:
Report
System:
The UNT Digital Library
The flow past an unswept-and a swept-wing-body combination and their equivalent bodies of revolution at Mach numbers near 1.0
"Tests utilizing the schileren method of flow photography have been conducted to provide a comparison of the complete flow fields past an unswept- and a swept-wing-body combination and the flow fields past their equivalent bodies of revolution at Mach numbers around 1.0. The results indicated that the shock growth and positions on the wing-body combinations were closely reproduced in the flow past the equivalent body" (p. 1).
Date:
June 1956
Creator:
Lindsey, Walter F.
Object Type:
Report
System:
The UNT Digital Library
An investigation of forward-located fixed spoilers and deflectors as gust alleviators on an unswept-wing model
Report presenting an investigation in the 300 mph 7- by 10-foot tunnel and gust tunnel to determine the static longitudinal aerodynamic characteristics an the gust-alleviation capabilities of forward-located fixed spoilers, deflectors, or a spoiler-deflector combination on a simulated transport airplane model with an unswept wing. Results regarding the static/force test, dynamic/gust-tunnel test, and short-period frequency and damping are provided.
Date:
June 1956
Creator:
Croom, Delwin R.; Shufflebarger, C. C. & Huffman, Jarrett K.
Object Type:
Report
System:
The UNT Digital Library
Theoretical wave drag of shrouded airfoils and bodies
Formulas for the wave drag of shrouded symmetrical airfoils and shrouded bodies of revolution of arbitrary shape are derived by means of linearized theory. In the case of the airfoils, the shroud consists of flat plates and for the bodies of revolution the shroud is a cylindrical shell. The results obtained hold for a Mach number range dependent on the geometry of the configuration. Expressions are also given for determining a class of body shapes for which the wave drag is theoretically zero.
Date:
June 1956
Creator:
Byrd, Paul F.
Object Type:
Report
System:
The UNT Digital Library
Fatigue crack propagation in severely notched bars
Report presenting fatigue testing in rotating bending on severely notched bars machined from 2024-T4 aluminum-alloy extruded round rods. Two sizes of specimens were studied.
Date:
June 1956
Creator:
Hyler, W. S.; Abraham, E. D. & Grover, H. J.
Object Type:
Report
System:
The UNT Digital Library
Experimental Measurements of Forces and Moments on a Two-Dimensional Oscillating Wing at Subsonic Speeds
"Experimental results of lifts and moments about the quarter chord of a two-dimensional wing at subsonic Mach numbers are presented. A comparison of the experimental magnitude of the lift vector with the theory as given by Dietze showed good agreement. Comparisons of the moments and the quadrature component of lift with theory indicated that some refinements in the testing technique are necessary for the experimental determination of these quantities in the transonic range" (p. 1).
Date:
June 1956
Creator:
Clevenson, Sherman A. & Widmayer, Edward, Jr.
Object Type:
Report
System:
The UNT Digital Library
Flutter of Thin Propeller Blades, Including Effects of Mach Number, Structural Damping, and Vibratory-Stress Measurements Near the Flutter Boundaries
Report presenting the results of an investigation on the flutter of propeller blades with three different plan forms. The propellers tested included one with highly twisted 2-percent-thick blades, 6-percent-thick blades, and two sets of 3-percent-thick blades with different internal damping. Results regarding the effect of various parameters on the stall flutter boundaries and blade stresses near the flutter boundary are provided.
Date:
June 1956
Creator:
Hubbard, Harvey H.; Burgess, Marvin F. & Sylvester, Maurice A.
Object Type:
Report
System:
The UNT Digital Library
Investigation at Supersonic Speeds of the Variation With Reynolds Number and Mach Number of the Total, Base, and Skin-Friction Drag of Seven Boattail Bodies of Revolution Designed for Minimum Wave Drag
Results are presented from an investigation of the variation with Reynolds number and Mach number of the total, base, and skin-friction drag of seven boattail bodies of revolution designed for minimum wave drag according to the theory of NACA-TN-2550. The tests covered a Reynolds number range from approximately 1.0 x 10(6) to 10.0 x 10(6) at Mach numbers of 1.62, 1.93, and 2.41 respectively.
Date:
June 1956
Creator:
Bromm, August F., Jr. & Goodwin, Julia M.
Object Type:
Report
System:
The UNT Digital Library
Selection of Optimum Configurations for Heat Exchanger With One Dominating Film Resistance
Note presenting an investigation of the problem of selecting heat-exchanger configurations for optimum performance. The method of optimization is illustrated for several compact heat-exchanger configurations where a prescribed amount of heat is transferred. The results for heat-exchanger configurations for which data is reported in the literature are presented in the form of charts illustrating the method of analysis and results that can be drawn.
Date:
June 1956
Creator:
Eckert, E. R. G. & Irvine, T. F., Jr.
Object Type:
Report
System:
The UNT Digital Library
Performance Analysis of Fixed- and Free-Turbine Helicopter Engines
Note presenting an analysis of fixed- and free-turbine engines applicable to helicopter propulsion. Generalized performance charts are presented for the engines and comparisons are made of off-design specific fuel consumption, altitude performance, power-speed characteristics, and response times. At design shaft speeds and turbine-inlet temperature ratios, the equivalent power developed by both the fixed- and free-turbine engines was about 91.4 horsepower per pound of air per second.
Date:
June 1956
Creator:
Krebs, Richard P. & Miller, William S., Jr.
Object Type:
Report
System:
The UNT Digital Library