Three-dimensional boundary layers on complex-shaped bodies at angles of attack

Abstract

The flow and heat transfer in a three-dimensional boundary layer when a compressible gas flows around a model body of complex shape at angles of attack α up to 30°, and around a spherically blunted cone when α = 10° are investigated both on the divergence line in the plane of symmetry of the body and on the whole surface. Full and simplified formulations with the corresponding systems of equations are given. Use is made of analytic and numerical methods for calculating the equations of three-dimensional laminar and turbulent boundary layers and data concerning the external inviscid flow and the geometry of the body. Particular attention is paid to the following problems: analysis of the system of equations in cases where it can be simplified, the closure of the averaged boundary-layer equations under turbulent conditions, the choice of the system of curvilinear coordinates, and an analysis of the effect of the governing parameters on the appearance of “separation” domains, characteristic zones and the lines of divergence and convergence on the surface.