The Role of Fluctuating Dissipative Fluxes in the Receptivity of High-Speed Reacting Binary Mixtures to Kinetic Fluctuations

摘要

Using fluctuating hydrodynamics, the receptivity of high-speed boundary layers in a binary mixture of gases (oxygen and nitrogen) to kinetic fluctuations (KF) is studied. An extension of the approach of Fedorov and Tumin (2017)~1 is presented for boundary layers in chemically reacting hypersonic mixtures that is free from the issues of the approach Luna and Tumin (2018).~2While the problem of boundary layer receptivity to kinetic fluctuations has been studied for some time now and its relevance for flight conditions has been established, there are no works that provide the full description of all fluctuating dissipative fluxes that must be modeled when working with non-perfect gasses such as multi-species air models under flight conditions. In particular, the role of stochastic components of the diffusion flux and the chemical source term are studied in the boundary layer receptivity problem in order to understand their role. For the cases considered, it is demonstrated that while the inclusion of these effects highly complicates the analysis, they have a subdominant effect on the problem.