CALCULATION OF VARIABLE DRAG AND HEAT-TRANSFER COEFFICIENTS IN METEORIC PHYSICS EQUATIONS |
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Authors: | D Yu KHANUKAEVA |
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Institution: | (1) Institute of Mechanics, Moscow State M.V. Lomonosov University, Michurinskiy-1, 119192 Moscow, Russia |
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Abstract: | The conservation of the ablation parameter is one of the main assumptions of the classical physical theory of meteors (PTM).
But this value does vary dramatically on meteoroids trajectories for the most part of them. The drag and heat-transfer coefficients
in the basic equations of PTM are considered from the gasdynamical point of view and mathematically modeled in the present
paper. Analytical approximations of the drag and heat transfer coefficients valid for any flow regimes and separate approximation
of the drag coefficient for free-molecule regime are offered and discussed. They use the Reynolds number as the main parameter
characterizing flow regimes. The variations of coefficients result in the variation of the ablation parameter by 100% for
meteoroids, passing all the flow regimes. The importance of correct calculation of the coefficients for meteoroids motion
modeling was demonstrated by the numerical examples. |
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Keywords: | Meteoroids drag coefficient approximation heat transfer coefficient approximation free-molecule flow regime continuum flow regime |
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