关键词: 流场畸度;激波干扰;进气道;紊流度;频谱分析

Abstract: In the condition of certain boundary layer,the dynamic flow distortion in a two-dimensional convergent-divergent duct at the interaction of typical strong shock to turbulent boundary layer is emphatically investigated in this paper.It is found experimentally that four turbulenlence peaks exist along the height of duct downstream of the interaction region,as well as that each peak corresponds respectively to the inflexion point of the Pitot pressure profile. The effects of shock strength and the duct geometry on the dynamic flow distortions are also discu-ssed.The power spectral density (PSD) and probability density function (PDF) of Pitot pressure signals at the typical condition of the turbulence profile are analyzed in detail.It is noticed that the pattern of PDF of the Pitot pressure signals in vortex sheet at intersection of λ-shock is similar to that of sine wave in Gaussian noise

Key words: Flow distortion;Shock wave interaction;Inlet;Turbulence;Spectrum analysis