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对2 Ma均匀来流条件下大长径比L/D=17.5的等直圆截面隔离段内流场进行了数值模拟。研究了在不同背压和不同壁面粗糙度的条件下,隔离段内激波串形态、静压分布、总压恢复。结果表明:激波串位置与背压呈非线性关系,激波串中形成数道“X”形的激波,总压恢复系数随背压增加先减小后增大;壁面粗糙度增加会使激波串前的壁面压力有所增加,使激波串向上游移动,激波串的第一道激波强度增大,之后的激波强度迅速衰减。
The numerical simulation of the flow field in iso-section of equal circular cross-section with a large aspect ratio L / D of 17.5 at a uniform flow rate of 2 Ma was carried out. The shock wave shape, static pressure distribution and total pressure recovery in isolated section under different back pressure and different wall roughness were studied. The results show that the position of the shock wave train is nonlinear with the back pressure, and the shock wave of “X” shape is formed in the shock train. The total pressure recovery coefficient first decreases and then increases with the increase of back pressure. Wall roughness The increase will increase the pressure on the wall before the shock wave, so that the shock wave train moves upstream. The intensity of the first shock wave of the shock wave train increases and the intensity of the shock wave decays rapidly.