National Advisory Committee for Aeronautics (NACA) - 34 Matching Results

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Susceptibility to Welding Cracking, Welding Sensitivity, Susceptibility to Welding Seam Cracking, and Test Methods for These Failures

Description: "In the years after the First World war a very rapid development, which even today has by no means come to an end, took place in the field of welding; here also, as in most technical innovations, failures made their appearance. Thereupon comprehensive Investigations were undertaken by steel manufacturers and consumers with cooperation of the authorities. In most cases the reasons for failure could be determined and eliminated and further occurrences avoided by the use of new test methods" (p. 1… more
Date: June 1949
Creator: Zeyen, K. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental study of flow past turbine blades

Description: From Introduction: "The requirements on gas turbines for aircraft power units, namely, adequate efficiency, operation at high gas temperatures, low weight, and small dimensions, must be taken into consideration during the design of the blading. To secure good efficiency, it is necessary that the gas flow past the blades as smoothly as possible without separation. This is relatively easily obtainable in the accelerated flow of turbine blading, if the blade spacing is chosen small enough. A small… more
Date: June 1949
Creator: Eckert, E. & Vietinghoff-Scheel, K. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Researches on Preliminary Chemical Reactions in Spark-Ignition Engines

Description: "Chemical reactions can demonstrably occur in a fuel-air mixture compressed in the working cylinder of an Otto-cycle (spark ignition) internal-combustion engine even before the charge is ignited by the flame proceeding from the sparking plug. These are the so-called "prelinminary reactions" ("pre-flame" combustion or oxidation), and an exact knowledge of their characteristic development is of great importance for a correct appreciation of the phenomena of engine-knock (detonation), and conseque… more
Date: June 1943
Creator: Mühlner, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetics of Chemical Reactions in Flames

Description: In part I of the paper the theory of flame propagation is developed along the lines followed by Frank-Kamenetsky and one of the writers. The development of chain processes in flames is considered. A basis is given for the application of the method of stationary concentrations to reactions in flames; reactions with branching chains are analyzed. The case of a diffusion coefficient different from the coefficient of temperature conductivity is considered.
Date: June 1946
Creator: Zeldovich, Y. & Semenov, N. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparative Results of Tests on Several Different Types of Nozzles

Description: "This paper presents the results of tests conducted to determine the effect of the constructional elements of a Laval nozzle on the velocity and pressure distribution and the magnitude of the reaction force of the jet. The effect was studied of the shapes of the entrance section of the nozzle and three types of divergent sections: namely, straight cone, conoidal with cylindrical and piece and diffuser obtained computationally by a graphical method due to Professor F. I. Frankle. The effect of t… more
Date: June 1944
Creator: Kisenko, M. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Influence of the Application of Power during Spin Recovery of Multiengine Airplanes

Description: "The effect of application of power, so far not clarified, is investigated in the present report in order to give the pilot, in addition to the control measures, an expedient for spin recovery of multiengine airplanes. To this end, a series of spins was performed with an airplane of the Go 150 type. It was possible to set up a uniform rule regarding the effect of power, for right end left spins as well as for any combination of the direction of rotation of the propellers" (p. 1).
Date: June 1949
Creator: Höhler, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Calibration and Measurement in Turbulence Research by the Hot-Wire Method

Description: "The problem of turbulence in aerodynamics is at present being attacked both theoretically and experimentally. In view of the fact however that purely theoretical considerations have not thus far led to satisfactory results the experimental treatment of the problem is of great importance. Among the different measuring procedures the hot wire methods are so far recognized as the most suitable for investigating the turbulence structure" (p. 1).
Date: June 1947
Creator: Kovasznay, Laszlo
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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