The role of tip leakage vortex breakdown in compressor rotor aerodynamics
The role of tip leakage vortex breakdown in compressor rotor aerodynamics
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DOI：
10.1115/1.2841339
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发表时间：
1999-07-01
影响因子：
1.7
通讯作者：
Yamada, K
中科院分区：
文献类型：
--
作者：
Furukawa, M;Inoue, M;Yamada, K
对一台中等叶片负荷的低速轴流压气机转子叶顶泄漏涡的破裂进行了研究。故障对旋翼空气动力学的影响通过N-S功率模拟和可视化技术来识别。模拟结果表明，当流量低于最大压升时，转子内部发生泄漏涡破裂。破裂的特征是存在停滞点，然后是气泡状的回流区。破裂的开始使撕裂泄漏涡的性质发生了显着的变化：涡流的大量膨胀和集中在涡流中的流向涡量的消失。膨胀对前缘上游有极大的阻挡作用。集中涡量的消失导致转子下游涡不卷起，机匣上的压力槽消失。转子下游的漏电功率场主要由向外的径向流动主导，这是由于击穿区域的气泡状结构收缩所致。结果表明，泄漏涡击穿对近失速状态下的旋翼性能有很大影响。当流量从峰值压力升高时开始下降时，击穿区域在流向、展向和俯仰方向上迅速增长。故障的增长导致堵塞和损失急剧增加。然后，击穿区域与叶片吸力面的相互作用导致吸力面边界层的三维分离，从而导致整个转子的总压升突然下降。
The breakdown of tip leakage vortex has been investigated on a low-speed axial compressor rotor with moderate blade loading. Effects of the breakdown on the rotor aerodynamics are elucidated by Navier-Stokes pow simulations and visualization techniques for identifying the breakdown. The simulations show that the leakage vortex breakdown occurs inside the rotor at a lower flow rate than the peak pressure rise operating condition. The breakdown is characterized by the existence of the stagnation point followed by a bubblelike recirculation region. The onset of breakdown causes significant changes in the nature of the rip leakage vortex: large expansion of the vortex and disappearance of the streamwise vorticity concentrated in the vortex. The expansion has an extremely large blockage effect extending upstream of the leading edge. The disappearance of the concentrated vorticity results in no rolling-up of the vortex downstream of the rotor and the disappearance of the pressure trough on the casing. The leakage pow field downstream of the rotor is dominated by the outward radial flow, resulting from the contraction of the bubblelike structure of the breakdown region. It is found that the leakage vortex breakdown plays a major role in characteristic of rotor performance at near-stall conditions. As the flow rate is decreased from the peak pressure rise operating condition, the breakdown region grows rapidly in the streamwise, spanwise, and pitchwise directions. The growth of the breakdown causes the blockage and the loss to increase drastically. Then, the interaction of the breakdown region with the blade suction surface gives rise to the three-dimensional separation of the suction surface boundary layer thus leading to a sudden drop in the total pressure rise across the rotor.