无叶扩压器内的射流-尾迹型扰动分析  

Jet-Wake Type Disturbance Analysis in Vaneless Diffuser

作　　者：高闯[1] 谷传纲[1] 王彤[1] 肖军[1] 

机构地区：[1]上海交通大学机械与动力工程学院叶轮机械研究所,上海200240

出　　处：《动力工程》2009年第4期326-329,341,共5页Power Engineering

基　　金：国家863计划资助项目(No.2006AA05Z250);国家自然科学基金资助项目(No.50676054)

摘　　要：假设扩压器内部流动为不可压缩的二维流动,采用小扰动方法建立了无叶扩压器的状态矩阵模型,并利用文献中数据对扩压器进口的射流-尾迹型扰动进行了分析.结果表明:径向速度扰动衰减比切向速度快;径向速度扰动衰减的快慢主要受进口流量的影响,进口相对流动角对其影响不大;叶轮叶片数对扰动衰减也有一定影响,叶片数越多,沿径向的速度扰动和角动量衰减就越快;叶轮和有叶扩压器之间的无叶空间可能是引起压缩机失稳的关键因素.模型分析和已有文献十分吻合,验证了模型的正确性.Assuming that the flow inside the vaneless diffuser was incompressible two dimensional flow, a state matrix model was established and analysis was made on the jet-wake type disturbance at the inlet of the diffuser based on published literatures. Results show that the decay process of radial velocity distortion is faster than that of tangential one; The attenuation of radial velocity distortion mainly depends on inlet flow rate instead of the inlet relative flow angle; The number of impeller blades has also some influence on the decay and the more the blades, the quicker the decay of both radial and tangential velocity disturbance; In addition, the analysis also shows the vaneless space between impeller and vaned diffuser is possibly the key factor of the compressor instability. The model analysis is quite in accordance with the literatures and correctness of the model is proved.

关 键 词：无叶扩压器 传递矩阵 射流-尾迹 扰动波 

分 类 号：TK474.82[动力工程及工程热物理—动力机械及工程]