超临界二氧化碳压缩机进口干度与气动性能关联性分析  

Correlation Analysis of Inlet Dryness and Aerodynamic Performance of Supercritical Carbon Dioxide Compressor

作　　者：周妙琴 张靖煊[1] 黄伟光[1,2,3] ZHOU Miaoqin;ZHANG Jingxuan;HUANG Weiguang(Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《动力工程学报》2022年第12期1265-1271,共7页Journal of Chinese Society of Power Engineering

摘　　要：运用数值模拟研究进口干度对超临界二氧化碳压缩机气动性能的影响,着重对比分析了不同进口干度时叶顶间隙流动的形态特征。结果表明:随着进口干度减小,超临界二氧化碳压缩机的最高效率点对应的流量增大,效率峰值升高,压比增大,喘振裕度增大;在设计流量及小流量工况时,效率随进口干度的减小而降低;在大流量工况时,效率随进口干度的减小而升高;当叶顶间隙为进口叶高的5%时,在相同工况下,进口干度越小,叶顶泄漏流越强,易形成“二次泄漏”。A numerical study was simulated on the impact of inlet dryness on the aerodynamic performance of supercritical carbon dioxide compressor,and the morphological feature of tip clearance flow under different inlet dryness was emphatically compared and analyzed.Results show that with the decrease of the inlet dryness,the mass flow rate at the maximum efficiency scenario,the peak efficiency,the pressure ratio and the surge margin increase.At design flow rate and low flow rate conditions,the efficiency decreases with the decrease of inlet dryness.At the condition of high flow rate,the efficiency increases with the decrease of inlet dryness.When tip clearance is 5%of inlet blade height at the same conditions,the smaller the inlet dryness is,the stronger the tip leakage flow will be,and the"secondary leakage"is easier to be formed.

关 键 词：超临界二氧化碳压缩机 气动性能 进口干度 叶顶泄漏流 

分 类 号：TK114[动力工程及工程热物理—热能工程]