280 Matching Results

Search Results

Results: 1 - 24 next
open access

Aerodynamic Characteristics of a Circular Cylinder at Mach Number 6.86 and Angles of Attack Up to 90 Degrees

Description: "Pressure-distribution and force tests of a circular cylinder have been made in the Langley 11-inch hypersonic tunnel at a Mach number of 6.88, a Reynolds number of 129,000, and angles of attack up to 90 degrees. The results are compared with the hypersonic approximation of Grimminger, Williams, and Young and a simple modification of the Newtonian flow theory. An evaluation of the crossflow theory is made through comparison of present results with available crossflow Mach number drag coefficien… more
Date: January 1957
Creator: Penland, Jim A.
Partner: UNT Libraries Government Documents Department
open access

Aerodynamic interference of slender wing-tail combinations

Description: From Introduction: "In the present paper, the emphasis is placed on calculating the variations of total forces and moments with angles of attack and sideslip for a number of slender plane and cruciform wing-tail combinations and for some airplane-type arrangements of a plane wing and a horizontal and vertical tail."
Date: January 1957
Creator: Sacks, Alvin H.
Partner: UNT Libraries Government Documents Department
open access

Alpha Ferric Oxide: Low Temperature Heat Capacity and Thermodynamic Functions

Description: ABS>The heat capacity of synthetic alpha ferric oxide was determined at 5 to 350 K. The experimental technique is described, and the heat capacity and molal thermodyamic functions are tabulated. The heat capacity vs. temperature is shown graphically. (J.R.D.)
Date: January 1, 1957
Creator: Gronvold, F. & Westrum, E. F., Jr.
Partner: UNT Libraries Government Documents Department
open access

ANALYSIS OF PROMPT EXCURSIONS IN SIMPLE SYSTEMS

Description: A calculation, coded for a fast computer, is discussed that can fairly accurately match the experimental resuIts obtained from the LASL Lady Godiva prompt burst program. In particular, the code can predict the reactivity where the burst yield deviates from a linear dependence on reactivity and commences to rise much more rapidly. The burst width and maximum rates can be predictcd with reasonable accuracy. The calculation is applied to other simple systems, with the result that there appear to b… more
Date: January 1, 1957
Creator: Stratton, W. R. & Colvin, T. H.
Partner: UNT Libraries Government Documents Department
open access

Analytical investigation of the effect of water injection on supersonic turbojet-engine - inlet matching and thrust augmentation

Description: From Introduction: "In order to provide engine-inlet matching to prevent such mass flow spillage and the attendant drags, much mechanical complication has been introduced. References 1 and 2 propose employing this principle at subsonic and supersonic speeds to achieve thrust augmentation. The merits of the system for supersonic engine-inlet airflow matching, as well as thrust augmentation, appear considerable; and a comparative study with existing fixed- and variable-geometry inlets was theref… more
Date: January 1957
Creator: Beke, Andrew
Partner: UNT Libraries Government Documents Department
open access

Base pressure at supersonic speeds on two-dimensional airfoils and on bodies of revolution with and without fins having turbulent boundary layers

Description: From Summary: "An analysis has been made of available experimental data to show the effects of most of the variables that are more predominant in determining base pressure at supersonic speeds. The analysis covers base pressures for two-dimensional airfoils and for bodies of revolution with and without stabilizing fins and is restricted to turbulent boundary layers. The present status of available experimental information is summarized as are the existing methods for predicting base pressure."
Date: January 1957
Creator: Love, Eugene S.
Partner: UNT Libraries Government Documents Department
open access

Booby Traps

Description: No Description Available.
Date: January 1, 1957
Creator: Paxton, H.
Partner: UNT Libraries Government Documents Department
open access

Boundary-layer transition at Mach 3.12 as affected by cooling and nose blunting

Description: Report presenting an investigation to determine the combined effects of nose blunting and cooling on boundary-layer transition. Data are presented for both sharp and blunted cone-cylinder and parabolic-nosed - cylinder bodies at a variety of Reynolds numbers. Results regarding the cone-cylinder model, parabolic-cylinder model, and transition reversal are provided.
Date: January 1957
Creator: Diaconis, N. S.; Jack, John R. & Wisniewski, Richard J.
Partner: UNT Libraries Government Documents Department
open access

Chemical Effects of Nuclear Transformations and Their Use in Making Labeled Compounds

Description: The chemical effects of nuclear transformations can be utilized to introduce the radioactive atoms produced into chemical species useful for tracer studies. Gas chromatography offers a means of separating the tagged compounds with high specific activity. A chromatographic apparatus for separating and identifying labeled compounds is described. Comparisons are made of this with other labeling techniques. (auth)
Date: January 1, 1957
Creator: Evans, J.B.; Quinlan, J.E. & Willard, J.E.
Partner: UNT Libraries Government Documents Department
open access

Comparison of calculated and experimental load distributions on thin wings at high subsonic and sonic speeds

Description: A method for calculating the aerodynamic loading on a wing in combination with a body is presented. Calculated results are compared with experimentally measured data for two wing-body configurations throughout a range of Mach number up to 1.0. The magnitude and the distribution of spanwise loading of the calculated data are generally in good agreement with the experimental data.
Date: January 1957
Creator: Crigler, John L.
Partner: UNT Libraries Government Documents Department
open access

Comparison of Mechanical Properties of Flat Sheets, Molded Shapes, and Postformed Shapes of Cotton-Fabric Phenolic Laminates

Description: Report presenting testing to determine the properties of several untreated commercial cotton-fabric pheonlic sheet laminates, the same sheets after exposure to a postforming heating cycle, industrially postformed shapes made from those materials, industrially molded and laboratory-molded shapes, and flat panels postformed in the laboratory from the laboratory-molded shapes. Results regarding tensile properties, flexural properties, and water absorption are provided.
Date: January 1957
Creator: Reinhart, F. W.; Good, C. L.; Turner, P. S. & Wolock, I.
Partner: UNT Libraries Government Documents Department
open access

Corrosion of Materials in the Presence of Fluorine at Elevated Temperatures

Description: A study of the corrosion of various metallic and ceramic materials by gaseous fluorine at elevated temperatures (400-750°C) has been made. This work was initiated to aid in the selection of matierals of construction for the Fluoride Volatility Process applied to irradiated plutonium-uranium alloys. The data obtained in this investigation indiciated nickel and Monel were suitable materials for use in a fluorine atmosphere at temperatures up to 550°C.
Date: January 1, 1957
Creator: Steindler, M.J. & Vogel, R.C.
Partner: UNT Libraries Government Documents Department
open access

Creep Behavior of Structural Joints of Aircraft Materials Under Constant Loads and Temperatures

Description: "The results of 55 creep and creep-rupture tests on structural joints are presented. Methods are described by which the time to rupture, the mode of rupture, and the deformation of joints in creep may be predicted. These methods utilize creep data on the materials of the joint in tension, bearing, and shear" (p. 1).
Date: January 1957
Creator: Mordfin, Leonard & Legate, Alvin C.
Partner: UNT Libraries Government Documents Department
open access

Debye-Huckel, Thomas-Fermi Theory of Plasmas and Liquid Metals: Numerical Solution

Description: A Debye-Huckel-type theory is described for an assembly of completely ionized atoms, the nuclei being treated classically and the electrons by the Thomas-Fermi method. The thermodynamic functions are derived by considering the Debye chnrging process, and the virial theorem is shown to hold. Numerical results are given for hydrogen and iron near normal solid densities, and are probably accurate only at high temperatures (kT > 5 ev for hydrogen and kT> 100 ev for iron). (auth)
Date: January 1, 1957
Creator: Cowan, R. D. & Kirkwood, J. G.
Partner: UNT Libraries Government Documents Department
open access

Design Evaluation of BER (Boiling Experimental Reactor) in Regard to Internal Explosions

Description: This is the Final Report on ARF Project No. D090 (formerly M073), "Design Evaluation of BER (Boiling Experimental Reactor) in Regard to Internal Explosions." This report was prepared by Armour Research Foundation for Argonne National Laboratory and summarizes the work accomplished from the time of the Phase Report I on May 10, 1955.
Date: January 1, 1957
Creator: Porzel, F. B.
Partner: UNT Libraries Government Documents Department
open access

Effect of ambient-temperature variation on the matching requirements of inlet-engine combinations at supersonic speeds

Description: Report presenting an analysis of the effect of ambient temperature on the matching requirements of inlet-engine combinations for two typical turbojet engines up to Mach number 3.5. The results indicated that if a bypass or movable compression surface are to be used for efficient inlet-engine matching, the inlet should be sized for the lowest ambient temperature to be encountered.
Date: January 1957
Creator: Perchonok, Eugene & Hearth, Donald P.
Partner: UNT Libraries Government Documents Department
open access

The effect of forward-flight speed on the propulsive characteristics of a pulse-jet engine mounted on a helicopter rotor

Description: Report presenting a determination of the effect of rotor forward speed on the propulsive characteristics of a blade-tip-mounted helicopter-type pulse-jet engine in the full-scale tunnel for various engine rotational speeds. The effect of forward speed was to decrease mean engine thrust and increase engine specific fuel consumption. Results regarding power-off engine drag, power-on engine thrust characteristics, and a general engine performance summary are provided.
Date: January 1957
Creator: Powell, Robert D., Jr.
Partner: UNT Libraries Government Documents Department
open access

Effect of Propeller Location and Flap Deflection on the Aerodynamic Characteristics of a Wing-Propeller Combination for Angles of Attack From 0 Degrees to 80 Degrees

Description: Note presenting an investigation to determine the effect of propeller location and flap deflection on the lift, drag, and pitching-moment characteristics of a wing-propeller combination over a range of angles of attack. The model had four propellers, the slipstream from which covered practically the entire span of the wing. The results indicated that power factors exist for changing the variation of pitching moment with speed.
Date: January 1957
Creator: Newsom, William A., Jr.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen