Nonequilibrium jet boundary layer in a polyatomic gas |
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Authors: | A L Ankudinov |
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Institution: | 1.Zhukovskii Central Institute of Aerohydrodynamics,Zhukovskii, Moscow oblast,Russia |
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Abstract: | The two-dimensional nonequilibrium hypersonic free jet boundary layer gas flow in the near wake of a body is studied using
a closed system of macroscopic equations obtained (as a thin-layer version) from moment equations of kinetic origin for a
polyatomic single-component gas with internal degrees of freedom. (This model is can be used to study flows with strong violations
of equilibrium with respect to translational and internal degrees of freedom.) The solution of the problem under study (i.e.,
the kinetic model of a nonequilibrium homogeneous polyatomic gas flow in a free jet boundary layer) is shown to be related
to the known solution of the well-studied simpler problem of a Navier-Stokes free jet boundary layer, and a method based on
this relation is proposed for solving the former problem. It is established that the gas flow velocity distribution along
the separating streamline in the kinetic problem of a free jet boundary layer coincides with the distribution obtained by
solving the Navier-Stokes version of the problem. It is found that allowance for the nonequilibrium nature of the flow with
respect to the internal and translational degrees of freedom of a single-component polyatomic gas in a hypersonic free jet
boundary layer has no effect on the base pressure and the wake angle. |
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Keywords: | |
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