Acoustic receptivity of Mach 4.5 boundary layer with leading-edge bluntness

摘要: Boundary layer receptivity to two-dimensional slow and fast acoustic waves is investigated by solving Navier–Stokes equations for Mach 4.5 flow over a flat plate with finite-thickness leading edge. Higher order spatial temporal schemes are employed obtain the solution whereby flat-plate edge region resolved providing sufficiently refined grid. The results show that instability generated in boundary-layer much more receptive (by almost factor of 20) as compared waves. Hence, this leading-edge mechanism expected be relevant transition process high number flows where second mode dominant. Computations performed investigate effect thickness it found bluntness tends stabilize boundary layer. Furthermore, relative significance enhanced presence bluntness. wave incidence angle also studied on ‘windward’ side (with respect forcing) decreases than four when increased from 0° 45°. However, coefficient ‘leeward’ vary relatively weakly angle.