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采用三维雷诺平均N-S方程和标准k-ε湍流模型,在设计工况下对3种隔板截面形状的超声速膨胀器的三维流道流场进行了数值研究.结果表明:矩形截面形状的超声速膨胀器近吸力面区域气流速度大,斜激波之后流动损失低,等熵绝热效率较高;正梯形截面形状的超声速膨胀器出口平均绝对马赫数、静压比以及膨胀比大,综合性能相对最优;角区附面层分离、回流形成的低速气流团以及斜激波所导致高速气流的增压过程是出口流动损失的主要来源;优化隔板沿径向的结构,超声速膨胀器的综合性能有望进一步提高.
Three-dimensional Reynolds-averaged Navier-Stokes equations and standard k-ε turbulence model were used to simulate the three-dimensional flow field of supersonic expander with three different cross-sectional shapes under the design conditions. The results show that the supersonic expansion The airflow near the suction side is high, the flow loss is low after the oblique shock wave, and the isentropic adiabatic efficiency is higher. The mean absolute Mach number, the static pressure ratio and the expansion ratio of the trapezoidal section supersonic expander are relatively large Which is the main source of outlet flow loss; the structure of the separator in the radial direction, the comprehensive performance of the supersonic expansion device Is expected to further improve.