INFLUENCE OF SMALL SPATIAL PERTURBATIONS OF SUPERSONIC FLOW VELOCITY ON THE HEAT FLUX TO THE CYLINDER SURFACE

摘要

The present paper deals with the threedimensional flow in a shock layer at supersonic transverse flow conditions over the front surface of a cylinder under small, spatially-periodic perturbations along the transverse coordinate. Based on the numerical solution of the unsteady three-dimensional Navier-Stokes equations, it is shown that small imposed perturbations of the free stream velocity (0.5 - 3 %) along the transverse coordinate lead to the shock curvature and cause the formation of vortex structures in the shock layer and significant perturbations of the heat flux on the surface.