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针对主氦风机结构,建立包括主氦风机叶轮和叶片扩压器的数值研究平台。利用该数值研究平台对主氦风机叶片扩压器进口安装角进行优化设计。结果表明,设计工况下,叶片扩压器的最优进口安装角为13°,此时主氦风机静压升254 k Pa,多变效率达到91%。设定叶片扩压器进口安装角为13°,利用数值研究平台对主氦风机变流量特性进行研究。结果表明,设计流量下主氦风机性能最优,70%设计流量至120%设计流量为较优运行范围,120%设计流量至140%设计流量下压升不满足设计要求。
Aiming at the structure of the main helium fan, a numerical research platform including main helium fan impeller and vane diffuser was established. The numerical analysis platform is used to optimize the inlet installation angle of the main helium fan vane diffuser. The results show that the optimum inlet installation angle of the blade diffuser is 13 ° under the design conditions. At this time, the static pressure of the main helium fan rises 254 kPa and the changeable efficiency reaches 91%. The setting angle of blade diffuser inlet was set to 13 °. The numerical simulation was used to study the variable flow characteristics of the main helium fan. The results show that the performance of the main helium fan is the best under the designed flow rate. The design flow of 70% design flow to 120% is the optimal operating range. The pressure rise from 120% design flow to 140% design flow does not meet the design requirements.