Receptivity of a supersonic boundary layer over a flat plate. Part 1. Wave structures and interactions

摘要: This paper is the first part of a two-part study on mechanisms receptivity to disturbances Mach 4.5 flow over flat plate by using both direct numerical simulations (DNS) and linear stability theory (LST). The main objective current characteristics boundary-layer wave modes their mutual resonant interactions. solutions steady base unsteady induced forcing are obtained fifth-order shock-fitting method. Meanwhile, LST results used supersonic relevant study. It found that, in addition conventional second modes, there exist family stable boundary layer. These play very important role process excitation unstable Mack especially mode. termed mode I, II, etc., this paper. Though I II waves linearly stable, they can have (synchronization) interactions with acoustic Mack-mode waves. Therefore, such as critical transferring energy between effects frequencies wall conditions for temperature perturbations also studied.