National Advisory Committee for Aeronautics (NACA) - 79 Matching Results

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Description of Russian Aircraft Engines "AM 35" and "AM 38"

Description: The Russian AM 35 and AM 38 aircraft engines have superchargers with a swirl throttle, which appears to be a purely Russian development. This paper gives the results of test runs of the two engines, including the effects of the swirl throttle on engine performance.
Date: June 1947
Creator: Denkmeier, H. & Gross, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determination of the Stress Concentration Factor of a Stepped Shaft Stressed in Torsion by Means of Precision Strain Gages

Description: The stress distribution in stepped shafts stressed in torsion is determined by means of the electric precision strain gage the stress concentration factor is ascertained from the measurements. It is shown that the test values always are slightly lower than the values resulting from an approximate formula.
Date: September 1947
Creator: Weigand, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development and Construction of an Interferometer for Optical Measurements of Density Fields

Description: "A method of interference is described in the present report which promises profitable application in aeronautical research. The physical foundation of the method and a simple method of adjustment are briefly discussed. The special technical construction of the instrument is described which guarantees its use also in the case of vibrations of the surrounding space and permits the investigation of unsteady phenomena" (p. 1).
Date: September 1947
Creator: Zobel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Distribution of Loads on Rivets Connecting a Plate to a Beam Under Transverse Loads

Description: "This report gives theoretical discussion of the distribution of leads on rivets connecting a plate to a beam under transverse leads. Two methods of solution are given which are applicable to loads up to the limit of proportionality; in the first the rivets are treated as discrete members, and in the second they are replaced by a continuous system of jointing. A method of solution is also given which is applicable to the case when nonlinear deformations occur in the rivets and the plate, but no… more
Date: April 1947
Creator: Vogt, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Drag Corrections in High-Speed Wind Tunnels

Description: In the vicinity of a body in a wind tunnel the displacement effect of the wake, due to the finite dimensions of the stream, produces a pressure gradient which evokes a change of drag. In incompressible flow this change of drag is so small, in general, that one does not have to take it into account in wind-tunnel measurements; however, in compressible flow it beoomes considerably larger, so that a correction factor is necessary for measured values. Correction factors for a closed tunnel and an o… more
Date: July 1947
Creator: Ludwieg, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Drag Reduction by Suction of the Boundary Layer Separated Behind Shock Wave Formation at High Mach Numbers

Description: "With an approach of the velocity of flight of a ship to the velocity of sound, there occurs a considerable increase of the drag. The reason for this must be found in the boundary layer separation caused by formation of shock waves. It will be endeavored to reduce the drag increase by suction of the boundary layer. Experimental results showed that drag increase may be considerably reduced by this method" (p. 1).
Date: July 1947
Creator: Regenscheit, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of Turbulence on the Flame Velocity in Gas Mixtures

Description: "The present report deals with the effect of turbulence on the propagation of the flame. Being based upon experiments with laminar as well as turbulent Bunsen flames, both the physico-chemical and the hydro-dynamical aspects of the problem are analyzed. A number of new deductions, interesting from the point of view of engine combustion and other very rapidly changing flame reactions, are made" (p. 1).
Date: April 1947
Creator: Damköhler, Gerhard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Elasto-Plastic Stability of Plates

Description: This article explains results developed from the following research: 'The Stability of Plates and Shells beyond the Elastic Limit.' A significant improvement is found in the derivation of the relations between the stress factors and the strains resulting from the instability of plates and shells. In a strict analysis, the problem reduces to the solution of two simultaneous nonlinear partial differential equations of the fourth order in the deflection and stress function, and in the approximate … more
Date: December 1947
Creator: Ilyushin, A. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equations for Adiabatic but Rotational Steady Gas Flows Without Friction

Description: This paper makes the following assumptions: 1) The flowing gases are assumed to have uniform energy distribution. ("Isoenergetic gas flows," that is valid with the same constants for the the energy equation entire flow.) This is correct, for example, for gas flows issuing from a region of constant pressure, density, temperature, end velocity. This property is not destroyed by compression shocks because of the universal validity of the energy law.
Date: August 1947
Creator: Schäefer, Manfred
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Force and Pressure-Distribution Measurements on a Rectangular Wing With a Slotted Droop Nose and With Either Plain and Split Flaps in Combination or a Slotted Flap

Description: Force measurements and pressure distribution measurements on the midsection were made on a rectangular wing with slotted droop nose and end plates, on which could be placed a choice of either a plain flap-split flap combination or a slotted flap.
Date: March 1947
Creator: Lemme, H. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Force and Pressure-Distribution Measurements on a Rectangular Wing With Double-Hinged Nose

Description: "The previous measurements on airfoils with hinged nose disclosed a comparatively large low-pressure peak at the bend of the hinged nose; which favored the separation of flow. It was therefore attempted to reduce these low-pressure peaks by reducing the camber of the forward profile and thereby ensure a longer adherence of the flow and a maximum lift increase. The forces were measured on a rectangular wing with double-hinged nose and end plates, the pressure distributions were measured in the c… more
Date: March 1947
Creator: Lemme, H. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamental Aerodynamic Investigations for Development of Arrow-Stabilized Projectiles

Description: "The numerous patent applications on arrow-stabilized projectiles indicate that the idea of projectiles without spin is not new, but has appeared in various proposals throughout the last decades. As far as projectiles for subsonic speeds are concerned, suitable shapes have been developed for sometime, for example, numerous grenades. Most of the patent applications, though, are not practicable particularly for projectiles with supersonic speed" (p. 1).
Date: December 1947
Creator: Kurzweg, Hermann
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamentals of the Control of Gas-Turbine Power Plants for Aircraft, Part 1: Standardization of the Computations Relating to the Control of Gas-Turbine Power Plants for Aircraft by the Employment of the Laws of Similarity

Description: "It will be shown that by the use of the concept of similarity a simple representation of the characteristic curves of a compressor operating in combination with a turbine may be obtained with correct allowance for the effect of temperature. Furthermore, it becomes possible to simplify considerably the rather tedious investigations of the behavior of gas-turbine power plants under different operating conditions. Characteristic values will be derived for the most important elements of operating … more
Date: April 1947
Creator: Kühl, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamentals of the Control of Gas-Turbine Power Plants for Aircraft, Part 2: Principles of Control Common to Jet, Turbine-Propeller Jet, and Ducted-Fan Jet Power Plants

Description: "After defining the aims and requirements to be set for a control system of gas-turbine power plants for aircraft, the report will deal with devices that prevent the quantity of fuel supplied per unit of time from exceeding the value permissible at a given moment. The general principles of the actuation of the adjustable parts of the power plant are also discussed" (p. 1).
Date: April 1947
Creator: Kühl, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamentals of the Control of Gas-Turbine Power Plants for Aircraft, Part 3: Control of Jet Engines

Description: "The basic principles of the control of TL engines are developed on the basis of a quantitative investigation of the behavior of these behavior under various operating conditions with particular consideration of the simplifications permissible in each case. Various possible means of control of jet engines are suggested and are illustrated by schematic designs" (p. 1).
Date: May 1947
Creator: Kühl, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gas-Dynamic Investigations of the Pulse-Jet Tube, Parts 1 and 2

Description: Based upon a simplified representation of the mode of operation of the pulse-jet tube, the effect of the influences mentioned in the title were investigated and it will be shown that, for a jet tube with a form designed to be aerodynamically favorable, the ability to operate is at least questionable. This investigation will account for the important practical observation made by Paul Schmidt that the ratio of the effective valve cross-sectional area to the tube cross section may not be of any r… more
Date: February 1947
Creator: Schultz-Grunow, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gas-Dynamic Investigations of the Pulse-Jet Tube, Parts 1 and 2

Description: "Based upon a simplified representation of the mode of operation of the pulse-jet tube, the effect of the influences mentioned in the title were investigated and it will be shown that, for a jet tube with a form designed to be aerodynamically favorable, the ability to operate is at least questionable" (p. 1).
Date: February 1947
Creator: Shultz-Grunow, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

General Characteristics of the Flow through Nozzles at Near Critical Speeds

Description: The characteristics of the position and form of the transition surface through the critical velocity are computed for flow through flat and round nozzles from subsonic to supersonic velocity. Corresponding considerations were carried out for the flow about profiles in the vicinity of sonic velocity.
Date: June 1947
Creator: Sauer, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-Speed Measurements on a Swept-Back Wing (Sweepback Angle phi = 35 Deg)

Description: "In the following, high-speed measurements on a swept-back wing are reported. The curves of lift, moment, and drag have been determined up to Mach numbers of M = 0.87, and they are compared to a rectangular wing. Through measurements of the total-head loss behind the wing and through schlieren pictures, an insight into the formation of the compression shock at high Mach numbers has been obtained" (p. 1).
Date: March 1947
Creator: Göthert, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Infinitesimal Conical Supersonic Flow

Description: The calculation of infinitesimal conical supersonic flow has been applied first to the simplest examples that have also been calculated in another way. Except for the discovery of a miscalculation in an older report, there was found the expected conformity. The new method of calculation is limited more definitely to the conical case.
Date: March 1947
Creator: Busemann, Adolf
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of the Operating Properties of the Leakage Current Anemometer

Description: "Freedom from inertia, erosion of electrodes, and reaction make the leakage current particularly appropriate for the measurement of flow velocities in gases. Apparatus previously described has now been improved by reducing the size of the electrodes by one -thousandth, as is necessary aerodynamically, and by increasing the magnitude of the current from 1000 to 10,000 times; the latter result was obtained.by use of mercury high-pressure lamps set up at the one focal point of an ellipsoidal refle… more
Date: October 1947
Creator: Fucks, Wilhelm
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigations of Compression Shocks and Boundary Layers in Gases Moving at High Speed

Description: The mutual influences of compression shocks and friction boundary layers were investigated by means of high speed wind tunnels.Schlieren optics provided a clear picture of the flow phenomena and were used for determining the location of the compression shocks, measurement of shock angles, and also for Mach angles. Pressure measurement and humidity measurements were also taken into consideration.Results along with a mathematical model are described.
Date: January 1947
Creator: Ackeret, J.; Feldmann, F. & Rott, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigations on Experimental Impellers for Axial Blowers

Description: "A selection of measurements obtained on experimental impellers for axial blowers will be reported. In addition to characteristic curves plotted for low and for high peripheral velocities, proportions and blade sections for six different blower models and remarks on the design of blowers will be presented" (p. 1).
Date: April 1947
Creator: Encke, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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