前/尾缘自由掠叶型跨声速离心压气机叶轮流动特性  

Flow Characteristic of Transonic Centrifugal Compressor with Free-Form Sweep Impeller at Leading and Trailing Edges

作　　者：田红艳 佟鼎[2] 张俊跃[2] 程江华[2] 刘欣源 Tian Hongyan;Tong Ding;Zhang Junyue;Cheng Jianghua;Liu Xinyuan(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;National Key Laboratory of Diesel Engine Turbocharging Technology,China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]中国北方发动机研究所柴油机增压技术重点实验室,天津300400

出　　处：《内燃机学报》2021年第6期554-560,共7页Transactions of Csice

基　　金：国防科技重点实验室基金资助项目(6142212180101).

摘　　要：针对某跨声速离心压气机叶轮,对其前/尾缘叶型进行了自由掠叶型的改进,并开展了相应的数值分析和试验验证,结果表明:在全转速范围内,离心叶轮前缘采用前自由掠叶型能够使叶轮更加适应进口的跨声速流动,有效改善叶轮进口的激波形态,增大堵塞流量,降低激波损失,增加效率.尾缘采用后自由掠叶型能够增加出口叶片的做功面积,抑制叶片尾缘间隙流动与主流结合形成的低能流团,从而使压比和稳定性提升.最后,针对设计的前/尾缘自由掠叶型跨声速离心压气机叶轮,开展了台架性能试验,验证了仿真分析结果.The free-form sweep method was used to improve the leading and trailing edges of impeller blade on a transonic centrifugal compressor,and corresponding numerical simulation and bench test were also carried out.The results show that in full speed range,the front free-sweep at the leading edge of the blade makes the impeller more suitable for the transonic flow at the inlet,which effectively improves the shape of shock wave.Additionally,the front free-sweep at the leading edge also increases the chock flow rate,reduces the shock loss and improves the efficiency of the centrifugal compressor.On the other hand,the free-sweep at trailing edge can increase the work area of the blade outlet,which reduces the low-energy flow structure formed by the combination of trailing edge clearance flow and the mainstream flow separation and leads to an increase of the pressure ratio and a stability improvement of the compressor.In the end,the improved transonic centrifugal compressor with free-form sweep impeller at leading and trailing edges was manufactured and then tested on a compressor test bench.It is found that the numerical results agrees well to the test results.

关 键 词：离心压气机 自由掠叶型 数值模拟 台架试验 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]