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针对采用超椭圆曲线方法设计的矩形转圆隔离段,在非对称来流条件下,利用数值模拟手段研究了出口反压、来流马赫数、进口附面层厚度等因素对其性能的影响。研究结果表明:出口反压与附面层相互作用导致初始激波形态转变为“λ”激波,并且隔离段的性能随着反压的增大而下降,低能流区域迅速增长,流场非对称效应逐渐变小;来流马赫数的增大会提高隔离段的抗反压能力,并且会降低流场的非对称效应,但出口总压恢复系数却随之下降,特别是与来流马赫数为2情况相比,当来流马赫数为2.5时其降低了7.2%;进口附面层厚度的增加会加剧隔离段内的流动分离,导致隔离段的抗反压能力降低,不利于隔离段出口流场品质,并且相对于均匀来流而言,当进口附面层无量纲厚度为0.33时出口总压恢复系数下降了13.7%。
Aiming at the rectangular round isolation section designed by hyperelliptic curve method, the effects of outlet backpressure, Mach Mach number and inlet top layer thickness on its performance are studied by means of numerical simulation under asymmetric incoming flow conditions. The results show that the interaction between the backpressure and the interface layer leads to the change of the initial shock shape into a shock wave of “λ ”, and the performance of the isolation section decreases with the backpressure increasing. The low energy flow region grows rapidly and the flow The field asymmetric effect becomes smaller. The increase of Mach number will increase the anti-back pressure capability of the isolation section and reduce the asymmetric effect of the flow field, but the total pressure recovery coefficient of the outlet decreases, especially with the incoming flow Mach number is reduced by 7.2% when the Mach number is 2.5 compared to Mach 2. The increase of the thickness of the imported interface layer will aggravate the flow separation in the isolation section, resulting in lower anti-back pressure capability of the isolation section, which is unfavorable to The quality of the flow field at the exit of the segregation section and the total pressure recovery coefficient of the outlet decreased by 13.7% when the non-dimensional thickness of the inlet cover was 0.33, compared with the uniform flow.