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首页> 外文会议>ASME Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >THE EFFECTS OF STEPPED TIP GAP ON PERFORMANCE AND FLOWFIELD OF A SUBSONIC AXIAL-FLOW COMPRESSOR ROTOR
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THE EFFECTS OF STEPPED TIP GAP ON PERFORMANCE AND FLOWFIELD OF A SUBSONIC AXIAL-FLOW COMPRESSOR ROTOR

机译：阶梯式间隙对亚音速轴流压气机转子性能和流场的影响

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摘要

This paper investigates the flow field at the tip region of compressor rotor. In particular, the effect of stepped tip gaps on the performance and flowfield of an axial-flow compressor rotor was reviewed using both experimental and computational methods. An axial compressor rotor with no inlet guide vanes was tested under subsonic condition. A parametric study of clearance levels and step profiles was performed using eight different casing geometries. This study was aimed at comparing compressor performance in specified configurations. The experimental results showed that the inclusion of stepped tip gaps with the small clearance level gave increased pressure ratio, efficiency, and stall margin throughout the mass flow range at both speeds. However, when using medium and large clearance level, the benefits of stepped tip gaps were not noticed for all rotor operating conditions if compared with the baseline case. Steady-state Navier-Stokes analyses were performed for cases involving small clearance level and stepped tip gap geometries. They highlighted the mechanisms associated with performance improvement. The numerical procedure correctly predicted the overall effects of stepped tip gaps. Detailed numerical simulation results showed that the interaction between the stepped groove flow and blade passage flow could entrain the blockage produced by upstream tip leakage flow into the tip gap of adjacent blades of the compressor rotor. It is through this process that stepped tip gaps can help dissipating blockage that was caused by upstream tip leakage flow. Thus the path and extent of the blockage in the tip region is altered to increase the passage throughflow area and so, the rotor performance can be improved.
机译：本文研究了压缩机转子尖端区域的流场。特别是，使用实验方法和计算方法都对阶梯状尖端间隙对轴流压缩机转子的性能和流场的影响进行了综述。在亚音速条件下测试了没有进气导叶的轴向压缩机转子。使用八种不同的套管几何形状对间隙水平和台阶轮廓进行了参数研究。这项研究旨在比较指定配置下的压缩机性能。实验结果表明，在两个速度下，在整个质量流量范围内，包含小间隙水平的阶梯状尖端间隙都会增加压力比，效率和失速裕度。但是，当使用中级和大型间隙水平时，与基准情况相比，并不是在所有转子工作条件下都注意到了阶梯状顶端间隙的好处。对涉及小间隙水平和阶梯状尖端间隙几何形状的情况进行了稳态Navier-Stokes分析。他们强调了与绩效改善相关的机制。数值程序正确地预测了阶梯状尖端间隙的整体效果。详细的数值模拟结果表明，阶梯槽流与叶片通道流之间的相互作用可以将上游叶尖泄漏流所产生的阻塞带入压缩机转子相邻叶片的叶尖间隙。通过该过程，阶梯状的尖端间隙可以帮助消除上游上游尖端泄漏流所引起的堵塞。因此，改变了尖端区域中的阻塞的路径和程度以增加通道通过面积，因此，可以提高转子性能。

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