On the relative “receptivity” of twoand three-dimensional supersonic boundary layers to stationary disturbances at mach 2

Abstract

Experiments on the in §uence of §at isolated square and diamond shaped roughness elements on the mean and pulsation characteristics of the boundary layer on a §at plate and a swept wing of comparable size are conducted. The shape of stickers has almost no e¨ect on the mass §ow pulsation amplitude in the trace of roughness. The relative ¤receptivity¥ of the three-dimensional (3D) boundary layer to stationary perturbations is approximately 1.5 times greater than the ¤receptivity¥ of the twodimensional (2D) boundary layer. The presence of roughness on the disturbance source line changes the pulsation spectra in 2D/3D boundary layer compared to the spectra in boundary layer on smooth surface.