正预旋对离心压缩机气动性能和内部流动影响的研究  

Investigation of Aerodynamic Performance and Internal Flow of a Centrifugal Compressor Under Positive Pre-swirls

作　　者：李帅 刘艳 王杨 LI Shuai;LIU Yan;WANG Yang(School of Energy and Power Engineering,Dalian University of Technology,Liaoning,Dalian 116023,China;Shenyang Blower Works Group Corporation,Liaoning,Shenyang 110869,China)

机构地区：[1]大连理工大学能源与动力学院,大连116023 [2]沈阳鼓风机集团股份有限公司,沈阳110869

出　　处：《工程热物理学报》2022年第4期950-959,共10页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.U1808214)。

摘　　要：本文采用数值计算方法,研究了正预旋对离心压缩机气动性能和内部流动的影响。研究结果表明:导叶正预旋调节使得压缩机级的性能曲线向小流量方向移动,拓宽了压缩机级的小流量工况范围。叶轮的输入功和叶轮的进气条件是影响压缩机级气动性能变化的主要原因。正预旋较大时,叶片前缘出现反向间隙流,降低了叶轮的做功能力。导叶尾迹效应和叶片通过频率共同影响着叶轮入口处的激振力,其中导叶尾迹效应影响较大。此外,增大叶轮正预旋虽然降低了模型级的气动性能,但也减小了叶轮入口的激振力。The effect of positive pre-swirls on the aerodynamic performance and internal flow in a centrifugal compressor stage is studied by means of numerical simulations. Research results show that the inlet guide vane’s positive pre-swirl makes the compressor stage’s performance curves move to the direction of low mass flow rate, which broadens the compressor stage’s working range at low mass flow rates. Both the impeller’s input work and the impeller’s inflow condition are the main reasons affecting the compressor stage’s aerodynamic performance. At a sizeable positive pre-swirl,the reverse clearance flow appears at the leading edge of the impeller blade, which reduces the impeller’s work capacity. The guide vane’s wake effect and the blade passage frequency simultaneously influence the excitation force at the impeller’s inlet, in which and the guide vane’s wake effect has a more significant influence. In addition, a sizeable positive pre-swirl decreases the compressor stage’s aerodynamic performance and reduces the exciting force at the impeller’s entrance.

关 键 词：进口导叶 正预旋 涡结构 叶顶间隙流 激振力 

分 类 号：TH452[机械工程—机械制造及自动化]