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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Effects of tip clearance size on the unsteady flow behaviors and performance in a counter-rotating axial flow compressor
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Effects of tip clearance size on the unsteady flow behaviors and performance in a counter-rotating axial flow compressor

机译：尖端间隙尺寸对反向旋转轴流式压缩机中非稳态流动特性和性能的影响

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摘要

This paper presents the studies performed to better understand the effects of increased tip clearance size on the unsteady flow behaviors and overall performance under the rotor-rotor interaction environment in a counter-rotating axial flow compressor. The investigation method is based on the three-dimensional unsteady Reynolds-averaged Navier-Stokes simulations. The results show that the intensified tip leakage flow in front rotor (R1) caused by the increased tip clearance size will lead to the growth of incoming incidence angle near the tip of the rear rotor (R2). The increasing of double leakage flow range plays a significant role in the sensitivity of the efficiency to tip clearance size and its extent is enlarged gradually with the increase of tip clearance size. As the tip clearance size is increased to 1.5 tau (tau represents the designed tip clearance size) from 0.5 tau, the results of the fast Fourier transform for the static pressure near blade tip show that two other new fluctuating frequency components appear due to the happening of tip leakage flow self-unsteadiness in R1 and R2, respectively. Additionally, the fluctuating strength near the tip in R2 is significantly increased. However, both the overall fluctuation in R1 caused by the potential effect from downstream and the oscillation in the hub corner on the pressure side of R2 are decreased obviously. The relative inflow angle tends to increase when the incoming wakes and tip leakage flow from R1 encounter the blade leading edge of R2, which leads to the result that the trajectory of tip leakage flow is shifted more upstream.
机译：本文介绍了进行的研究，目的是为了更好地了解增大的叶顶间隙尺寸对反向旋转轴流压缩机中转子-转子相互作用环境下的非稳态流动行为和整体性能的影响。研究方法基于三维非稳态雷诺平均Navier-Stokes模拟。结果表明，由于尖端间隙尺寸的增大而导致前转子（R1）中尖端泄漏流量的增加，将导致后转子（R2）尖端附近的入射入射角增大。二次泄漏流量范围的增大在效率对尖端间隙尺寸的敏感性中起着重要作用，并且其范围随着尖端间隙尺寸的增加而逐渐增大。当刀尖间隙大小从0.5 tau增加到1.5 tau（tau表示设计的刀尖间隙大小）时，叶片尖端附近静压的快速傅里叶变换结果表明，由于发生了这种情况，出现了另外两个新的波动频率分量R1和R2中的尖端泄漏流自不稳定性的关系。此外，R2中尖端附近的波动强度显着增加。但是，由下游的潜在效应引起的R1的总体波动和R2压力侧的轮毂角处的振荡均明显降低。当进入的尾流和来自R1的尖端泄漏流遇到R2的叶片前缘时，相对流入角趋于增加，这导致尖端泄漏流的轨迹向更上游移动。

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