哈尔滨工程大学学报2023，Vol.44Issue(12)：2112-2118,7.DOI:10.11990/jheu.202309005
几何结构对S-CO2离心压缩机热力学性能影响分析
Effect of geometric structure on the thermodynamic performance of S-CO2 centrifugal compressor
摘要
Abstract
Centrifugal compressors are the core components of the supercritical carbon dioxide(S-CO2)Brayton cy-cle,and their internal structure and flow heat transfer mechanism are complex.Therefore,this study conducts one-dimensional and three-dimensional numerical simulations on MW-level S-CO2 centrifugal compressors to investigate the effect of multiple structures on the performance of S-CO2 centrifugal compressors.Based on this model,a linear weighted sum method is used to quantitatively study the thermodynamic performance caused by changes in five dif-ferent structural parameters of the compressor.The results show that the back bend angle of the blades and the length of the vaneless diffuser have the greatest effect on the performance of the centrifugal compressor,followed by the number of blades,the length of the splitter blades,and the tip clearance.Additionally,increasing the number of blades can improve the power capacity and pressure ratio of the impeller,but too much will reduce efficiency.The pressure ratio and efficiency of the centrifugal compressor decrease with the increase in blade tip clearance within the 0.25～0.75 mm range.The optimal splitter blade length coefficient in this paper is 0.74.The findings of this study can provide a reference for the subsequent design of centrifugal compressors in the S-CO2 Brayton cycle system.关键词
超临界二氧化碳/离心压缩机/线性加权和法/几何敏感性/热力学性能/几何结构/布雷顿循环/流动换热Key words
S-CO2/centrifugal compressor/linear weighted method/geometric sensitivity/thermodynamic proper-ties/geometric structure/Brayton cycle/flow and heat transfer分类
数理科学引用本文复制引用
赵富龙,田游游,田瑞峰,胡朝营,刘凯..几何结构对S-CO2离心压缩机热力学性能影响分析[J].哈尔滨工程大学学报,2023,44(12):2112-2118,7.基金项目
国家级青年人才项目(2021QNRC001). （2021QNRC001）
