Rotating instabilities in an axial compressor originating from the fluctuating blade tip vortex
Rotating instabilities in an axial compressor originating from the fluctuating blade tip vortex
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DOI：
10.1115/1.1370160
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发表时间：
2001-07-01
影响因子：
1.7
通讯作者：
Vogeler, K
中科院分区：
文献类型：
--
作者：
Mailach, R;Lehmann, I;Vogeler, K
旋转不稳定性（RI）已经在轴流风扇和离心压缩机以及低速和高速轴流压缩机中观察到。它们负责激发高振幅转子叶片振动和产生噪声。这种流动。该现象相对于转子叶片移动，并在叶片尖端处引起周期性的涡流分离，以及通过转子叶片的尖端间隙的轴向反向流。本文介绍了在德累斯顿低速研究压气机（LSRC）的RI的实验研究。目的是表明，叶尖涡的波动是造成这种流动现象的原因。在转子叶片叶尖间隙较大的情况下，在压气机稳定性极限附近的工作点处发现了RI。时间分辨传感器在固定和旋转参考系中的应用使得能够详细描述这种非定常流现象的周向结构和空间发展，这种非定常流现象仅限于叶尖区域。转子叶片通道内和叶尖间隙内的激光多普勒风速仪（LDA）以及转子叶片上的非定常压力测量显示了叶尖涡流的结构。它将被证明，周期性的相互作用的一个叶片的叶尖涡的流动在相邻的叶片是负责的旋转结构的产生与高模式的订单，称为旋转不稳定性。
Rotating instabilities (RIs) have been observed in axial flow fans and centrifugal compressors as well as in low-speed and high-speed axial compressors. They are responsible for the excitation of high amplitude rotor blade vibrations and noise generation. This flow. phenomenon moves relative to the rotor blades and causes periodic vortex separations at the blade tips and an axial reversed flow through the tip clearance of the rotor blades. The paper describes experimental investigations of RIs in the Dresden Low-Speed Research Compressor (LSRC). The objective is to show, that the fluctuation of the blade tip vortex is responsible for the origination of this flow phenomenon. RIs ha ve been found at operating points near the stability limit of the compressor with relatively large tip clearance of the rotor blades. The application of time-resolving sensors in both fixed and rotating frame of reference enables a detailed description of the circumferential structure and the spatial development of this unsteady flow phenomenon, which is limited to the blade tip region. Laser-Doppler-anemometry, (LDA) within the rotor blade passages and within the tip clearance as well as unsteady pressure measurements on the rotor blades show the structure of the blade tip vortex. It will be shown that the periodical interaction of the blade tip vortex of one blade with the flow at the adjacent blade is responsible for the generation of a rotating structure with high mode orders, termed a rotating instability.