Three-Dimensional Spatial Normal Modes in Compressible Boundary Layers

摘要: Three-dimensional spatially growing perturbations in a two-dimensional compressible boundary layer are considered within the scope of linearized Navier{Stokes equations. The Cauchy problem is solved under assumption flnite growth rate disturbances. It shown that solution can be presented as an expansion into biorthogonal eigenfunction system. result utilized for decomposition ∞ow flelds derived from computational studies when pressure, temperature, and all velocity components, together with some their derivatives, available. method used also if partial data available priori information may alogorithm. Properties discrete spectrum over cone adiabatic wall at edge Mach number 5.6 explored. synchronism slow mode acoustic waves low frequency or Reynolds primarily two-dimensional. At high angles disturbance propagation, fast no longer synchronized entropy vorticity modes.