Influence of the Clearance Size on Rotating Instability in an Axial Compressor Stator
Influence of the Clearance Size on Rotating Instability in an Axial Compressor Stator
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发表时间：
2013-04
影响因子：
2.4
通讯作者：
L. E. B. Pardowitz
中科院分区：
文献类型：
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作者：
L. E. B. Pardowitz
为了提高对轴向涡轮非定常二次流结构的认识，对轴向压气机定子内的流动进行了研究。它在稳定线附近运行，可以配备可变轮毂间隙。给出了非定常气动和声压测量、高速粒子图像测速和湍流解析数值模拟的结果。发现了旋转不稳定性（RI）现象的典型特征。一项参数研究分别改变间隙大小和叶片载荷，揭示了即使没有轮毂间隙的定子配置也会出现令人惊讶的RI。这与迄今为止的假设相矛盾，即轮毂或尖端间隙需要到位才能出现旋转不稳定性
In order to improve the understanding of unsteady secondary flow structures in axial turbomachines, the flow in a scaled axial compressor stator was studied. It was operated in the vicinity of the stability line and could be equipped with variable hub clearances. Results from unsteady aerodynamic and acoustic pressure measurements, high-speed Particle Image Velocimetry measurements, and turbulence resolving numerical simulations are presented. Typical characteristics of the rotating instability (RI) phenomenon were found. A parameter study varying the clearance size and the blade loading, respectively, revealed the surprising occurrence of the RI even for the stator configuration without hub clearance. This contradicts the hitherto presumption of a hub or tip clearance needed to be in place for a rotating instability to emerge