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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Effects of inlet radial distortion on the type of stall precursor in low-speed axial compressor
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Effects of inlet radial distortion on the type of stall precursor in low-speed axial compressor

机译：入口径向变形对低速轴流压气机失速前驱体类型的影响

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摘要

Experimental investigations of the effect of inlet blade loading on the rotating stall inception process are carried out on a single-stage low-speed axial compressor. Temporal pressure signals from the six high response pressure transducers are used for the analysis. Pressure variations at the hub are especially recorded during the stall inception process. Inlet blade loading is altered by installing metallic meshed distortion screens at the rotor upstream. Three sets of experiments are performed for the comparison of results, i.e. uniform inlet flow, tip, and hub distortions, respectively. Regardless of the type of distortion introduced to the inflow, the compressor undergoes a performance drop, which is more severe in the hub distortion case. Under the uniform inlet flow condition, stall inception is caused by the modal type disturbance while the stall precursor switched to spike type due to the highly loaded blade tip. In the presence of high blade loading at the hub, spike disappeared and the compressor once again witnessed a modal type disturbance. Hub pressure fluctuations are observed throughout the process when the stall is caused by a modal wave while no disturbance is noticed at the hub in spike type stall inception. It is believed that the hub flow separation contributes to the modal type of stall inception phenomenon. Results are also supported by the recently developed signal processing techniques for the stall inception study.
机译：在单级低速轴向压缩机上进行了进气叶片负载对旋转失速开始过程影响的实验研究。来自六个高响应压力传感器的时间压力信号用于分析。在失速开始过程中，特别记录下轮毂上的压力变化。通过在上游转子处安装金属网状变形筛网，可以改变进口叶片的载荷。进行三组实验以比较结果，即分别是均匀的入口流量，叶尖和轮毂变形。不管流入的失真类型如何，压缩机都会遭受性能下降，这在轮毂变形情况下更为严重。在均匀的入口流量条件下，失速开始是由模态类型的扰动引起的，而失速前体由于叶片的高负荷而切换为尖峰类型。在轮毂上叶片负荷高的情况下，峰值消失，压缩机再次出现模态扰动。当失速由模态波引起时，在整个过程中都观察到轮毂压力波动，而在尖峰型失速开始时，在轮毂上未发现任何干扰。据认为，轮毂流分离有助于失速开始现象的模态类型。最近开发的用于失速开始研究的信号处理技术也支持该结果。

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