大长径比圆截面隔离段流场的数值研究

Numerical Research of the Flow of Large Ratio of Length to Diameter Separation Section

摘要:

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。

Abstract:

Numerical simulation of separation section with large ratio of length to diameter L/D=17.75 at uniform inflow of 2 Mach was performed. The shock train, static pressure distribution and total pressure recovery at different back pressure and wall roughness were illustrated. The results showed that the positions of shock train had nonlinear correlation with back pressure. The disconnection of “X” shape formed in the shock train. The total pressure recovery increased at first and then decreased with the growth of backpressure. The roughness of the wall would make the pressure of the wall before shock train improved and shock train went to upstream. The dissipation of shock train would be enhanced.