超临界二氧化碳循环离心压缩机性能与流场分析  

Performance and Flow Field Analysis of Supercritical Carbon Dioxide Circulation Centrifugal Compressor

作　　者：张磊[1] 董铮 杨振宇[1] 孙恩慧[1] ZHANG Lei;DONG Zheng;YANG Zhenyu;SUN Enhui(Department of Power Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学(保定)动力工程系,保定071003

出　　处：《工程热物理学报》2023年第5期1209-1218,共10页Journal of Engineering Thermophysics

基　　金：国家自然科学基金面上项目(No.52076079);河北省自然科学基金面上项目(No.E2020502013);中央高校基本科研业务费专项资金(No.2021MS079)。

摘　　要：压缩机是超临界二氧化碳(S-CO_(2))布雷顿循环的核心部件之一。本文以多级回热过程的热力学分析为基础,完善适用于S-CO_(2)Brayton循环热力设计,为不同循环结构的压缩机选择等熵效率合理适用范围。通过对叶轮内部流场模拟,分析压缩机性能,发现本文设计的叶轮模型在转速60000 r/min时具有最高的等熵效率。存在一个最佳的进口温度和压力使叶轮内的低温低压区域最小。随着流量和转速的增加,相变或冷凝区域范围会进一步增加,为超临界二氧化碳离心压缩机内部流场数值模拟的准确性和S-CO_(2)循环机组中压缩机的初步设计提供参考。The compressor is one of the core components of the supercritical carbon dioxide(S-CO_(2))Brayton cycle.Based on the thermodynamic analysis of the multi-stage regenerative process,this paper improves the thermodynamic design method suitable for the S-CO_(2) Brayton cycle,and selects a reasonable range of isentropic efficiency for compressors with different cycle structures.Numerical simulation is used to analyze the internal flow field and performance of the compressor,it is found that the designed impeller model in this paper has the highest isentropic efficiency when the RPM is 60000 r/min.There is an optimum inlet temperature and pressure to minimize the low temperature and low pressure area within the impeller.With the increase of flow rate and rotational speed,the range of phase transition or condensation area will further increase,which provides a reference for the accuracy of numerical simulation of the supercritical carbon dioxide centrifugal compressor and the preliminary design of the compressor in the S-CO_(2) Brayton cycle.

关 键 词：超临界二氧化碳 多级回热循环 数值模拟 离心压缩机 

分 类 号：TH452[机械工程—机械制造及自动化]