A model of spontaneous condensation of boron oxide vapor in chemically reacting gas mixtures is proposed, based on the classical theory of nucleation and one-speed and one-temperature approximation for the equations of two-phase mixture flow. The model considers nucleation, condensational growth, coagulation, and gas-phase chemical reactions of molten boron oxide droplets. Numerical research of the spontaneous condensation of boron oxide in flat nozzles of different sizes and geometries was carried out using the model. The condensation shock wave is shown to occur immediately behind the nozzle throat. The highest nucleation rates (up to 10 24    s 1 m 3 ) are characteristic of a zone adjacent to the sidewall of the nozzle, where the rate of expansion of combustion products is maximum. In nozzles with similar geometries, the position of the front of the condensation shock wave does not depend on the linear dimensions of the nozzle; and only the Mach number in front of the condensation shock wave determines its position. In flat nozzles with geometrically similar inlet regions, the front of the condensation shock wave position does not depend on the nozzle linear dimensions because the condensation shock wave is formed in the field that is independent of the expansion angle of the nozzle. The effect of gas-phase chemical reactions on the spontaneous condensation of boron oxide vapor development is estimated. This effect is weak and tangible only in large nozzles.


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    Title :

    Numerical Research of Spontaneous Condensation of Boron Oxide Vapor in Flat Nozzles



    Published in:

    Publication date :

    2022-07-05


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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