MODELING OF EXTERNAL PRESSURE GRADIENT INFLUENCE ON THE STABILITY OF DISTURBANCES IN THE BOUNDARY LAYERS OF COMPRESSED GAS

This work continues the research on modeling of passive methods of management of flow regimes in the boundary layers of compressed gas. Authors consider the influence of pressure gradient on the evolution of perturbations of different nature. For low Mach number M = 2 increase in pressure contributes to an earlier transition of laminar to turbulent flow, and, on the contrary, drop in the pressure leads to a prolongation of the transition to turbulence. For high Mach number M = 5.35 found that the acoustic disturbances exhibit a very high dependence on the sign and magnitude of the external gradient, with a favorable gradient of the critical Reynolds number becomes smaller than the vortex disturbances, and at worst – boundary layer is destabilized directly on the leading edge.

Keywords:
hypersonic boundary layer, hydrodynamic stability of laminar-turbulent transition.
УДК 532.526

MODELING OF EXTERNAL PRESSURE GRADIENT INFLUENCE ON THE STABILITY OF DISTURBANCES IN THE BOUNDARY LAYERS OF COMPRESSED GAS