低温氦气离心风机气动设计及变工况性能预测

Aerodynamic Design and Off-Design Performance Prediction of Centrifugal Compressor with Cryogenic Helium Gas as Working Fluid

低温氦气离心风机是超导磁体循环预冷系统的关键驱动设备,其性能优劣直接影响整个预冷系统的性能。本文按真实气体模型计算气体的热物性,自主开发了离心压缩机初步气动设计和变工况性能预测程序,对以低温氦气为工质的离心风机进行初步设计和变工况性能预测。基于三维流场数值仿真分析验证该低温离心风机内部流动情况和级性能。结果显示:低温氦气离心风机在各工况下都有良好的气动性能,本文所建立的气动设计及性能预测方法准确可靠,可用于磁体循环预冷系统低温氦气离心风机的初步设计与性能评估。

Cryogenic helium centrifugal compressor is the key supercharging equipment of helium precooling system of superconducting magnet.Its performance directly affects the whole precooling system performance.This paper develops the aerodynamic design and performance prediction programs independently for centrifugal compressor and the thermodynamic properties of the working fluid are accurately calculated as real gas.The aerodynamic design and off-design performance prediction of the centrifugal compressor with cryogenic helium gas as the working fluid are presented.The numerical simulation method is used to analyze and validate the three-dimensional flow field and the performance of the cryogenic helium centrifugal compressor.The results show that the designed cryogenic helium compressor has good aerodynamic performance in design and off-design conditions.The preliminary aerodynamic design and performance prediction method established in this paper is accurate and reliable.And it can be used for the preliminary design and performance evaluation of the cryogenic helium centrifugal compressor of the superconducting magnet precooling system.