Numerical Simulation of Pressure Fluctuation near an Expansion Corner in a Supersonic Flow of M = 3.01

The influence of the expansion corner on pressure fluctuation is an important subject in supersonic flow around high-speed vehicles. Past studies have clarified how alters root-mean-square fluctuating coefficient (Cprms) and power spectral density (PSD) without considering these properties are related to compressible waves. In this paper, we use characteristics determine direction wave propagation identified three zones—U-zone, M-zone D-zone—within which both Cprms PSD likely display different behaviors across boundary layer. U-zone upstream characteristic line second family passing through corner. D-zone downstream first middle zone lies between D-zone. results at layers within layer obtained using numerical computation a Detached Eddy Simulation (DES). It found that D-zone, same M-zone, however, may vary variation occurs high-frequency band mid-frequency A feedback mechanism tentatively used explain difference spatial distribution inside M-zone.