高速微型离心压气机的改型设计

近年来微型涡喷发动机的研究受到国内外的高度重视。微型叶轮机作为微型涡喷发动机的核心,其内部流动状况及特性是研究的重点。本文首先采用S-A湍流模型,对某微型涡喷发动机的离心压气机(转速118 000 r/min)的地面状态和设计转速下的粘性流场进行了三维数值模拟计算,得到了压气机特性曲线。接着对该离心压气机进行了改型。通过与原型三维流场的对比分析,实施了改型流道设计,重点在于调整转子流道的形状以及转子出口与径向扩压器之间的流道匹配。改型离心压气机的三维流场计算结果表明,基本达到改型设计要求。

Redesign of a High Speed Micro-centrifugal Compressor

Recent years,investigations of micro turbine engine have been paid increasing attention worldwide.As micro turbomachinery being the core component of a micro turbine engine,the inside flow condition and its performance have become key issues.A three dimension numerical simulation was developed for one small centrifugal compressor with splitter blades.There were the flow field performances under the take off condition with design speed,using Spalart-Allmaras model.Then a redesign for flow path was carried out on this compressor.It stressed on the matching between the rotor outlet and the radial diffuser inlet and the path shape of impeller.Through the checking computation about the remodel compressor,it could fit the fundamental design demand.