Stability of a supersonic Couette flow of vibrationally excited diatomic gas
Within the linear theoiy, we study stablllty of the Couette flow of vlbrationally exclted dla-tomlc gas with a parabolic profile of static temperature. The original mathematical model of the gas flow is the system of equations of two-temperature aerodynamics. As a result, it has been shown that when a certain combination of values of the parameter of the test flow (Reynolds number Re, Mach number M, bulk viscosity а 1, the degree of vibrational nonequilibrium y vlb, and vibrational relaxation time t), it can be both stable and unstable with respect to small pertm'ba-tlons. For viscous peгtuгbatlons, the spectra of eigenvalues, the growth increments, and neutral stability cures in the plane (Re, а) were calculated Йзг the frist and second growing modes in the range of numbere M = 2-6 and Re = 10 -10 . The range of variation of the critical Reynolds number Re cl- « (2-5)-10 was found. It is shown that the second mode is most unstable &>г all levels of excitation. The excitation does not actually change the shape of the region of instability, but its boundaries shift to higher wave numbers with increasing excitation. It can be stated that, in general, the excitation of internal degrees of freedom of the gas molecules reduces the disturbance growth increments and has a stabilizing effect on the flow.
Keywords
critical Reynolds number, unstable viscous excitation modes, equations of two-temperature aerodynamics, vibrational relaxation, hydrodynamic stability, критическое число Рейнольдса, неустойчивые вязкие моды возмущений, уравнения двухтемпературной аэродинамики, колебательная релаксация, гидродинамическая устойчивостьAuthors
Name | Organization | |
Ershov Igor Valer'evich | Novosibirsk State University of Architecture and Civil Engineering | i_ershov@ngs.ru |
References

Stability of a supersonic Couette flow of vibrationally excited diatomic gas | Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika – Tomsk State University Journal of Mathematics and Mechanics. 2015. № 1(33).