Unsteady tip clearance flow in an isolated axial compressor rotor
Unsteady tip clearance flow in an isolated axial compressor rotor
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DOI：
10.1007/s11630-005-0004-4
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发表时间：
2005-09
影响因子：
2.5
通讯作者：
Hongwu Zhang;X. Deng;Jingyi Chen;Weiguang Huang
中科院分区：
文献类型：
--
作者：
Hongwu Zhang;X. Deng;Jingyi Chen;Weiguang Huang
采用三维非定常N-S数值模拟方法，研究了工况、间隙大小和外部非定常激励对轴流压气机转子非定常间隙流动的影响。结果表明，非定常间隙涡在转子叶尖区域呈现周期性流动行为。随着流量系数的减小，非定常间隙涡增强，频率降低。在近失速工况下，较大的间隙尺寸会导致间隙涡的非定常波动幅值较大，波动频率较低。利用间隙涡的固有频率进行非定常激励，可以增强间隙涡的非定常性，提高转子的整体性能。非定常间隙涡的频率与不同频率的外部非定常激励无关。
The paper investigates effects of operating conditions, tip clearance sizes and external unsteady excitations on the unsteady tip clearance flow in an isolated axial compressor rotor by unsteady 3D Navier-Stokes simulations. The results show that the unsteady tip clearance vortex takes a periodic flow behavior in the rotor tip region. With the decrease of the flow coefficient, the unsteady tip clearance vortex is enhanced and its frequency becomes lower. A larger tip clearance size can cause bigger unsteady fluctuation amplitude and a lower fluctuation frequency of the tip clearance vortex at the near stall operating condition. The unsteady excitation with the natural frequency of the tip clearance vortex can enhance the unsteadiness of the tip clearance vortex and improve the overall rotor performance. The frequency of the unsteady tip clearance vortex is independent of external unsteady excitations with different frequencies.