Technical Report Archive & Image Library (TRAIL) - 27 Matching Results

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Diagrams for Calculation of Airfoil Lattices

Description: "The field for curved blades is represented by a vortex series with a vortex removed at the blade point. Further, an example of calculation of a curved blade from this series is given, whereby the necessary accuracy required of the different methods in practice is shown according to the case considered" (p. 1).
Date: July 1942
Creator: Betz, Albert
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculation of the Pressure Distribution on Bodies of Revolution in the Subsonic Flow of a Gas Part 1 - Axially Symmetrical Flow

Description: "The present report concerns a method of computing the velocity and pressure distributions on bodies of revolution in axially symmetrical flow in the subsonic range. The differential equation for the velocity potential Phi of a compressible fluid motion is linearized tn the conventional manner, and then put in the form Delta(Phi) = 0 by affine transformation. The quantity Phi represents the velocity potential of a fictitious incompressible flow, for which a constant superposition of sources by … more
Date: July 1947
Creator: Bilharz, Herbert & Hölder, Ernst
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On the Installation of Jet Engine Nacelles on a Wing Fourth Partial Report: Pressure-Distribution Measurements on a Sweptback Wing with Jet Engine Nacelle

Description: "The present report, which deals with pressure-distribution measurements made on a sweptback wing with a jet engine nacelle, is similar to a report on pressure-distribution measurements on a rectangular wing with a jet engine nacelle (second partial report). Here, in investigations preliminary to high-speed measurements, as in the second partial report, useful arrangements and fillet designs have been discovered" (p. 1).
Date: July 1949
Creator: Buschner, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Prediction of Downwash and Dynamic Pressure at the Tail From Free-Flight Measurements

Description: "The present measurements form a continuation of earlier flight tests published in a previous report for predicting the downwash at the tail of an airplane. The method makes use of the tail itself as integrating contact surface to the extent that, beginning from the measurement of the self-alignment of the elevator, the mean downwash angle and dynamic pressure at the tail are determined. The instrumental accuracy is considerably improved if the elevator is completely separate from the controls … more
Date: July 1942
Creator: Eujen, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Results With Airfoils Tested in the High-Speed Tunnel at Guidonia

Description: The results are presented of a triple series of tests using force measurements, pressure-distribution measurements, and air flow photographs on airfoil sections suitably selected so that comparison could be made between the experimental and theoretical results. The comparison with existing theory is followed by a discussion of the divergences found, and an attempt is made to find their explanation.
Date: July 1940
Creator: Ferri, Antonio
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of Flow in a Centrifugal Pump

Description: "The investigation of the flow in a centrifugal pump indicated that the flow patterns in frictional fluid are fundamentally different from those in frictionless fluid. In particular, the dead air space adhering to the section side undoubtedly causes a reduction of the theoretically possible delivery head. The velocity distribution over a parallel circle is also subjected to a noticeable change as a result of the incomplete filling of the passages" (p. 1).
Date: July 1946
Creator: Fischer, Karl
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Design of Jet Pumps

Description: This report shows that by applying both energy and impulse theorems the optimum throat dimension of the mixing nozzle and the best shape of intake can be predicted approximately in a relatively simple manner. The necessary length of the mixing nozzle follows from Prandtl's turbulent mixing theory. The calculations are carried out for the mixing of similar and dissimilar fluids.
Date: July 1941
Creator: Flügel, Gustav
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experiments on Ball and Roller Bearings Under Conditions of High Speed and Small Oil Supply

Description: This report describes a testing machine on which 35 millimeter bearings (bore) can be run at speeds of the order of 21,000 rpm, while the following factors are recorded: 1) oil circulation through bearing and oil temperature. 2) maximum temperature of outer bearing ring, 3) radial and axial load on bearing, 4) radial, axial, and angular clearance of bearing, 5) power consumption of bearing. The experiments show that the lubrication was most reliable and oil consumption lowest when the oil was i… more
Date: July 1940
Creator: Getzlaff, Günter
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On the Problem of Stress Corrosion

Description: "The object of the present work is first to investigate accurately the processes during stress corrosion, in particular, for light metal alloys and, as the first part of the investigation, to determine its laws; and secondly to explain its causes for various alloys and thereby find means for its partial or complete elimination and thus make possible the production of light metal alloys free from any stress corrosion. In the present paper some of the results of the investigation are given and th… more
Date: July 1946
Creator: Graf, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical Treatment of Normal Condensation Shock

Description: "The condensation of water vapor in an air has the following consequences: acquisition of heat (liberated heat vaporization; loss of mass on the part of the flowing gas (water vapor is converted to liquid); change in the specific gas constants and of the ratio k of the specific heats (caused by change of gas composition). A discontinuous change of state is therefore connected with the condensation; schlieren photographs of supersonic flows in two-dimensional Laval nozzles show two intersecting … more
Date: July 1947
Creator: Heybey
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Flights for Testing of a Reactor as an Expedient for the Termination of Dangerous Spins

Description: "In the Institute for Flight Mechanics of the DVL a reactor arrangement with a maximum output of 100 kg was investigated as an expedient for the termination of dangerous spins on an airplane of the FW 56 type. reproduce the influence of a disturbance of the steady spin condition by a pitching or yawing moment. The tests were meant to reproduce the influence of a disturbance of the steady spin condition by a pitching and yawing moment" (p. 1).
Date: July 1949
Creator: Höhler, P. & v. Köppen, I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pressure-Distribution Measurements on Unyawed Swept-Back Wings

Description: "This report presents comprehensive pressure-distribution measurements on four (4) swept-back wings (phi = 0 deg, 15 deg, 30 deg, and 45 deg) of constant chord and over a large range of angles of attack with symmetrical air flow. The distributions, experimentally obtained, were compared with theoretical ones calculated by the methods of Weissinger and Multhopp" (p. 1).
Date: July 1947
Creator: Jacobs, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Two-Dimensional Potential Flow Past an Ordinary Thick Wing Profile

Description: "This report deals with the development of a method which gives a lucid and convenient solution of the flow conditions in the vicinity of a common, thick airfoil section wherein the thickness of the profile is taken into account. The method consists in making the airfoil the streamline in a parallel flow by disposing on its mean line certain source and vortex distributions the fields of which are superposed on the parallel flow. These distributions of singularities are secured for the generaliz… more
Date: July 1942
Creator: Keune, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary Report on the Fundamentals of the Control of Turbine-Propeller Jet Power Plant

Description: "On the basis of the investigations so far completed on the behavior of PTL power plants under various operating conditions, in which the influence of the propeller characteristics is of considerable importance, the most important aspects of a control system for turbine-propeller jet power plants are deduced. A simple possible means for its concrete realization, which is also applicable to TL [NACA comment: TL, jet] power plants, is presented by means of examples. A control device of this kind … more
Date: July 1947
Creator: Kühl, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Integral Methods in the Theory of the Boundary Layer

Description: From Summary: "The application of the well-known basic principle of mechanics, the principle of Jourdain, to problems of the theory of the boundary layer leads to an equation from which the equations of Von Karman, Leibenson, and Golubev are derived as special cases. The given equation may be employed in other integral methods. The present paper deals with the method of the variation of the thickness of the boundary layer. A number of new approximate formulas valuable in aerodynamic calculation… more
Date: July 1944
Creator: Loitsianskii, L. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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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Investigation of Conditions of Titanium Carbonization - 4

Description: "In a previous paper, results are presented of accurate investigations of the processes of titanium carbonization and the succeeding titanium carbide decarbonization as related to the phenomenon of the graphitization of soot by heating at a constant temperature in atmospheres of pure hydrogen and carbon monoxide. These tests showed that the processes of titanium carbonization-decarbonization in an atmosphere of pure gases without nitrogen proceed in the same direction as the analogous processes… more
Date: July 1949
Creator: Meerson, G. A. & Lipkes, Y. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New Equipment for Testing the Fatigue Strength of Riveted and Welded Joints

Description: "The mechanical and electrical construction of a new experimental instrument for fatigue testing riveted and welded joints is described. This experimental device has the advantage of being able to stress, even with comparatively low magnetic exciter force, structural components in alternate bending by resonance vibrations up to incipient fatigue failure (p .1)".
Date: July 1940
Creator: Müller, W.
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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New Method of Calculating the Power at Altitude of Aircraft Engines Equipped With Superchargers on the Basis of Tests Made Under Sea-Level Conditions

Description: "The present article deals with what is considered to be a simpler and more accurate method of determining, from the results of bench tests under approved rating conditions, the power at altitude of a supercharged aircraft engine, without application of correction formulas. The method of calculating the characteristics at altitude, of supercharged engines, based on the consumption of air, is a more satisfactory and accurate procedure, especially at low boost pressures" (p. 1).
Date: July 1941
Creator: Sarracino, Marcello
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On the Theory of the Unsteady Motion of an Airfoil

Description: "The paper presents a systematical analysis of the problem of the determination of the unsteady motion about an airfoil moving in an infinite fluid that contains a system of vortices and the determination of the hydrodynamical forces acting on the airfoil. The hydrodynamical problem is reduced to the determination of the function f (xi) which transforms conformally the external region of the airfoil into the interior of a circle. The proposed methods of determining the irrotational motion of a … more
Date: July 1947
Creator: Sedov, L. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Micromechanical Study of Metals

Description: "The Institut Scientifique Experimental des Transports at Moscow established toward the end of 1925 had since its inception included in its program the study of the mechanism of plastic deformation and the problems associated with it with reference to the materials of the means of transport. Before the program thus determined upon could be carried out, it was necessary to adopt a method of research, or, more exactly, a system of such methods. Because of the modest equipment of the laboratory of… more
Date: July 1945
Creator: Velikov, P. A.; Stchapov, N. P. & Lorenz, W. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Report on Rocket Power Plants Based on T-Substance

Description: "In the search for an energy source independent of air for the propulsion of underwater craft, attention was early concentrated on T-substance. It was possible to convince the OKM [NACA comment: Navy High Command] very quickly of the importance of this material. In 1934, the first experiments were undertaken" (p. 1).
Date: July 1947
Creator: Walter, Hellmuth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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