A high-order model of rotating stall in axial compressors with inlet distortion |
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Authors: | Peng LIN Cong WANG Yong WANG |
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Institution: | 1. School of Automation Science and Engineering, South China University of Technology, Guangzhou 510641, China;2. Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China |
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Abstract: | In this paper,a high-order distortion model is proposed for analyzing the rotating stall inception process induced by inlet distortion in axial compressors.A distortion-generating screen in the compressor inlet is considered.By assuming a quadratic function for the local flow total pressure-drop,the existing Mansoux model is extended to include the effects of static inlet distor tion,and a new high-order distortion model is derived.To illustrate the effectiveness of the distortion model,numerical simulations are performed on an eighteenth-order model.It is demonstrated that long length-scale disturbances emerge out of the distorted background flow,and further induce the onset of rotating stall in advance.In addition,the circumferential non-uniform distribution and time evolution of the axial flow are also shown to be consistent with the existing features.It is thus shown that the high-order distortion model is capable of describing the transient behavior of stall inception and will contribute further to stall detection under inlet distortion. |
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Keywords: | Axial compressors Dynamic modeling Flow instability Inlet distortion Rotating stall Stall inception |
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