Study on Stagger Angle Optimization Design of Helium Circulator Vane Diffuser
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摘要: 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。Abstract: A numerical platform was set for the helium circulator in HTR, which included impeller and vane diffuser. It was utilized in the stagger angle optimization design of vane diffuser. The optimization results show that 13 deg is the most optimized stagger angle under the design condition. The corresponding static pressure rise is 254 k Pa and the polytropic efficiency achieves 91%. Then the stagger angle of vane diffuser was set 13 deg. The performance and flow characteristics of the helium circulator under various flow conditions were studied through above numerical platform. The results show that the performance under the design condition is the most optimed one, and the recommended operation range is from 70% to 120% design flow rate, and the static pressure rise under conditions from 120% to 140% design flow rate does not satisfy the design requirement.
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