本文采用实验方法研究了外部横流马赫数对圆柱孔、扇形孔、后倾扇形孔、收敛缝型孔流量系数特性影响。所研究的外部横流马赫数范围为0~0.65,气膜孔压比范围为0~2。实验结果表明,无外部横流时,流量系数由大到小依次为,扇形孔,后倾扇形孔,圆柱孔,收敛缝孔。外部横流对气膜孔流量系数影响显著,外部横流降低了气膜孔的流量系数,且气膜孔压比越小,外部横流马赫数的影响越大。与前人工作相比,本文给出了高马赫数外部横流下新型气膜孔的实验数据,最后根据实验数据建立了不同气膜孔型流量系数预测模型,完善了收敛缝孔的流量系数预测模型,在所研究的参数范围内模型预测最大偏差不超过5%。

An experimental study was performed on the discharge coefficients of cylindrical hole, fan-shaped hole, laidback fan-shaped hole and console hole under different external crossflow orientations. The studied external crossflow Mach number ranges from 0 to 0.65, and the pressure ratio of holes ranges from 0 to 2. The experimental results show that when there is no external crossflow, the discharge coefficients are, from large to small, fan-shaped hole, laidback fan-shaped hole, cylindrical hole, console hole. External crossflow has a significant influence on the discharge coefficient of the film holes, and the external crossflow reduces the discharge coefficient of the film holes, and the smaller the film holes pressure ratio, the greater the influence of the external crossflow Mach number. Compared with the previous work, the experimental data of new film holes under high Mach number external crossflow are given in this paper. Finally, according to the experimental data, the discharge coefficient prediction model of different film holes is established, and the discharge coefficient prediction model of console hole is improved. The maximum deviation of the model prediction is less than 5% within the studied parameter range.

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国家自然科学基金优秀青年(N0.52122603)；国家自然科学基金青年科学(No.52106064)；国家科技重大专项(J2019-II-0022-0043)