顶部喷气对高速轴流压气机性能及流场的影响

Numerical investigation of tip injection effect on a high-speed axial compressor flow field and performance

关键词:  轴流压气机  数值仿真  流动分布  失速  喘振

Key words:  Axial-compressor  Numerical simulation  Flow field  Stalling  Surge

摘要:

喷气是提高压气机稳定工作裕度的有效措施之一。采用数值模拟方法研究了顶部喷气对某轴流压气机气动性能的影响。数值计算所获得实壁机匣总性能与其试验结果相吻合。喷气数值计算结果表明,转子上游约30%轴向弦长处的喷气推迟了失速的发生。通过详细地分析顶部喷气对压气机顶部区域流场结构的影响,揭示了其扩稳机理。

Abstract:

Injection is known as a effective method to enhance the flow stability in compressors.The effect of tip injection on the performance of an axial-flow compressor was performed numerically.The numerical results of smooth wall agreed well with experimental data for the global performance of smooth wall.The injective numerical results showed that the injection of upstream near the rotor leading 30% axial chord edge can suspend the stall.Analysis of the effect on tip flow topologies led to some preliminary conclusions as to the flow physics involved in the stall margin improvements afforded by tip injection.