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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Effects of Inlet Boundary Layer Thickness on Characteristics of Rotating Stall in Subsonic Axial Compressor
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Effects of Inlet Boundary Layer Thickness on Characteristics of Rotating Stall in Subsonic Axial Compressor

机译：亚音速轴流压气机入口边界层厚度对失速特性的影响

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摘要

A 3D numerical simulation was conducted to study the effect of inlet boundary layer thickness on rotating stall in an axial compressor. The inlet boundary layer thickness had significant effects on the hub-corner-separation at the corner of hub and suction surfaces. The hub-corner-separation grew considerably for a thick inlet boundary layer as the load increased, while it diminished to become indistinguishable from the rotor wake for a thin inlet boundary layer and another corner-separation originated near the casing. This difference in the internal flow near stall also had a large effect on characteristics of the rotating stall, especially the initial asymmetric disturbance and the size of stall cells. While a pre-stall disturbance arises firstly in the hub-corner-separation for the thick inlet boundary layer, an asymmetric disturbance was initially generated in the tip region because of the corner-separation for the thin inlet boundary layer. This disturbance was transferred to the tip leakage flow and grew to become an attached stall cell, which adheres to the blade passage and rotates at the same speed as the rotor. When this attached stall cell reached a critical size, it started moving along the blade row and became a short-length-scale rotating stall. The size of the stall cell for the thick inlet boundary layer was larger than for the thin inlet boundary layer. Due to the bigger size of the stall cell, the performance of the single rotor for the former case dropped more significantly than for the latter case.
机译：进行了3D数值模拟，以研究入口边界层厚度对轴流式压缩机旋转失速的影响。入口边界层厚度对轮毂和吸力表面拐角处的轮毂角分离有重大影响。当负载增加时，对于较厚的入口边界层，毂角分离明显增加，而对于较薄的入口边界层，毂角分离变得与转子尾流变得无法区分，并且在机壳附近产生了另一个角分离。失速附近内部流的这种差异也对旋转失速的特性有很大影响，尤其是初始的不对称扰动和失速单元的尺寸。虽然首先对于厚入口边界层的毂角分离首先发生失速扰动，但由于对于较薄入口边界层的拐角分离，最初在尖端区域中产生了不对称扰动。这种扰动被转移到尖端泄漏流，并逐渐发展成为一个附着的失速室，该失速室粘附在叶片通道上并以与转子相同的速度旋转。当这个附着的失速室达到临界尺寸时，它开始沿着叶片排移动并变成短长度的旋转失速。较厚的入口边界层的失速单元的尺寸大于较薄的入口边界层的失速单元的尺寸。由于失速单元的尺寸较大，前者的单转子性能下降明显大于后者。

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