带分流叶片离心叶轮气动设计及其流场分析

为提高某涡轴发动机的性能,需要对其离心压气机进行改进.本文设计了带分流叶片的离心叶轮,以确保离心压气机在不降低喘振裕度的前提下,设计点总压比提高不低于0.3,效率提高不低于2%.计算结果表明新设计的离心叶轮达到了设计指标.流场分析显示,新设计的叶轮有效地控制了气流分离,减小了出口尾迹的强度与范围;分流叶片的长度对叶轮效率有一定影响,合理的分流叶片长度可以有效地削弱二次流强度,提高叶轮效率.

Design and Flow Investigation of a Centrifugal Impeller with Splitter Blade

It is necessary to redesign the centrifugal compressor to improve the performance of a turboshaft engine. The emphasis of this paper is to design the compressor impeller with a splitter to increase the compressor pressure ratio by over 0.3 and isentropic efficiency by more than 2%, without sacrificing surge margin. NUMECA Fine/Turbo is employed as a numerical tool to ensure the design. As indicated, the new impeller successfully reaches these objectives. Numerical simulation shows that the new impeller will reduce separation, and decrease the intensity of the wake; splitter blade with reasonable length can effectively weaken the secondary flow, reduce the loss and improve the efficiency.