A Gas Dynamical Formulation for Waves And Combustion in Pulse Jets
A Gas Dynamical Formulation for Waves And Combustion in Pulse Jets
J K L Macdonald
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A. C. A. , Aerojet Corporation and N. Y. IJ. , will be expanded so as to provide the desired data. In this connection the following comments may be helpful: High speed movies (2000 or more frames per second, both direct and shadowgraphic pictures): Judging from the preliminary movies taken through windows (or glass walls) in pulse -Jets, much information can be obtained relatively easily by this method. Direct high speed movies can show (quantitatively) the motions of the flames from the time o...f re-ignltlon until the time of extinction: on the other hand, if a sodium compound is added to the fuel to make the hot gas glow, a measure of the turbulent motions of the hot gases may be obtained. Shadowgraphic high-speed movies may be made by directing sunlight through two transparent sides of a pulse-Jet and then onto an otheirwise shaded screen which can be photographed. Such shadowgraphic movies can show the turbulent motions of the gases as they move from the intake down the tube, and quantitative information -29- may thus be obtained on the one-dlmenslonalized velocities involved.
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