氦气离心压气机高压比设计研究

Research on High Pressure Ratio Design of Helium Centrifugal Compressor

氦气离心压气机是预冷发动机氦回路的核心部件,但国内对氦气离心压气机的相关探究较少。为探究氦气离心压气机的压比设计方法,从离心压气机进口和出口速度三角形的角度,分析了出口安装角、滑移因子以及进气负预旋对叶轮做功的影响。提出了基于低出口安装角、高滑移因子和进气负预旋的高压比设计方法。根据此方法设计出了总压比为2.521、等熵效率为83.2%、喘振裕度为18.55%的氦气离心压气机,并通过数值模拟的方法对此压气机的气动特性以及流场进行了分析,证明了高压比设计方法的可行性。

The helium centrifugal compressor is the core component of the helium circuit of the pre-cooling engine, but there are few domestic researches on helium centrifugal compressors.In order to explore the design method of the pressure ratio of the helium centrifugal compressor, the influence of the outlet installation angle, slip factor and negative pre-swirl of the air intake on the impeller’s work is analyzed from the perspective of the inlet and outlet velocity triangles of the centrifugal compressor, and a high pressure ratio design method based on low outlet installation angle, high slip factor and negative pre-swirl of the air intake is proposed.According to this method, a helium centrifugal compressor with total pressure ratio of 2.521,isentropic efficiency of 83.2% and surge margin of 18.55% is designed.And through the compressor the aerodynamic characteristics and flow field analysis, proved the feasibility of the high pressure design method.