| 摘要: |
| 利用二维数值模拟研究了低速轴流压气机上游尾迹对下游相邻叶排的非定常分离流场的影响。研究表明:满足一定通过频率和亏损幅值条件的尾迹能够有效抑制下游相邻叶排尾缘涡的生成,达到控制或是推迟附面层非定常分离的目的,从而使得流场时均性能大幅度的提高,损失系数降低了40 2%,功损比增加93%。为固有非定常潜能的利用提供了一类新途径。 |
| 关键词: 压气机 非定常流 分离流 尾流撞击效应+ |
| DOI： |
| 分类号:TH45 |
| 基金项目:北京航空航天大学博士生创新研究基金;国家自然科学基金(10072008)。 |
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| Numerical investigation of wake impact effect in low-speed axial compressor |
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ZHENG Xin-qian, ZHOU Sheng
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National Lab.of Aircraft Engine,Beijing Univ. of Aeronautics and Astronautics,Beijing 100083,China
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| Abstract: |
| By using a Reynolds-averaged two-dimensional computation,the effect of upstream wake on unsteady separated flow field of downstream adjacent vanes was investigated in low-speed axial compressor. The results indicated that the generation of trailing-vortex of downstream adjacent vanes could be restrained effectively by upstream wake when the passing frequency and the amplitude of wake defect satisfy some conditions,associated with a significant enhancement of time-averaged aerodynamic performances: loss coefficient reducing 40.2% and the ratio of loading coefficient and loss coefficient increasing 93%. Thus,a new approach was available to utilize the potentiality of intrinsic unsteady flow. |
| Key words: Air compressor unsteady flow Separated flow Wake impact effect |
