小流量高速离心叶轮参数设计和三维造型

对小流量高速离心叶轮一维气动优化设计及快速三维造型方法进行了研究,并发展了相应的计算程序.采用所述的方法,以Krain叶轮为基准对象,在保证原设计点性能的情况下进行了叶轮的全新参数设计和快速三维造型.造型中对叶片中心线进行了曲率优化控制,使得叶片符合气动性能优良的“S”型叶片.最后采用经校验的CFD软件对新设计的叶轮进行了全三维数值验证.数值验证结果显示:在设计流量时等熵效率为93.9％,增压比为4.794,与Krain叶轮设计点CFD验证的结果偏差分别为0.24％和2.14％,验证了该设计方法及程序的可行性.

Parameters design and 3-D modeling of small flow rate high-speed centrifugal impeller

Approaches about preliminary parameters deign and 3-D modeling of high-speed small flow rate centrifugal compressor were presented,and corresponding FORTRAN code was developed.In order to verify the feasibility of the approaches,an impeller based on Krain's impeller was modeled with its camber line optimized by curvature control.The blade of the impeller was matched with S-shaped blade of good aerodynamic performance.After analysis of CFD results,the redesigned impeller achieved isentropic efficiency of 93.9% and total pressure ratio of 4.794 on design mass flow rate,and the error was 0.24% and 2.14% respectively compared with Krain's impeller.Results show that the approaches and the code are valid for rapid impeller design.