超临界二氧化碳离心压缩机内部流场数值模拟  

Numerical Simulation of Internal Flow Field in Supercritical Carbon Dioxide Centrifugal Compressor

作　　者：于绍轩 赵海峰 Yu Shaoxuan;Zhao Haifeng(School of Chemical Equipment,Shenyang University of Technology,Liaoyang,Liaoning 111000,China)

机构地区：[1]沈阳工业大学化工装备学院,辽宁辽阳111000

出　　处：《机电工程技术》2025年第5期108-112,共5页Mechanical & Electrical Engineering Technology

摘　　要：超临界二氧化碳(SCO_(2))布雷顿循环中的离心压缩机工作在CO_(2)临界点附近,其内部流场与传统空气压缩机相比有较大差别,需对其进行深入研究。基于Sandia SCO_(2)布雷顿循环主压缩机几何参数建立了三维几何模型,采用数值模拟方法对SCO_(2)离心压缩机内部流场进行了仿真研究,探究了CO_(2)物性表分辨率对计算结果的影响,验证了数值方法的准确性,通过流场后处理分析了压缩机内部流场中的几种特殊流动现象。结果表明,采用范围4~40 MPa、270~470 K,分辨率200×200的CO_(2)物性表,可同时兼顾计算精度和成本;使用该数值方法模拟所得性能曲线与实验性能曲线趋势一致。对流场的后处理结果表明Sandia叶轮内部流场存在工质相变现象、尾缘流动分离现象和叶顶间隙二次流现象。分析结果可为SCO_(2)离心压缩机的研究提供有价值的参考。In a supercritical carbon dioxide(SCO_(2))Brayton cycle,the centrifugal compressor operates near the critical point of CO_(2).Its internal flow field differs significantly from that of traditional air compressors,necessitating thorough research.Based on the geometric parameters of the Sandia SCO_(2) Brayton cycle main compressor,a three-dimensional geometric model is established,and numerical simulation methods are used to conduct a simulated study of the internal flow field of the SCO_(2) centrifugal compressor.The impact of CO_(2) property table resolution is explored on calculation results,the accuracy of numerical methods is validated,and post-processing analysis of several special flow phenomena is conducted in the internal flow field of the compressor.The results indicate that using a CO_(2) property table with a range of 4~40 MPa and 270~470 K,and resolution of 200×200,can simultaneously balance calculation accuracy and cost.The performance curve of numerical simulation aligns with the trend of the experimental performance curve.Post-processing of the flow field reveals phenomena such as phase change of the working fluid,flow separation at the trailing edge,and secondary flow at the blade tip clearance within the Sandia impeller.These analyses provide valuable insights for the study of SCO_(2) centrifugal compressor.

关 键 词：超临界二氧化碳 离心压缩机 流场 数值模拟 

分 类 号：TH452[机械工程—机械制造及自动化] TP391[自动化与计算机技术—计算机应用技术]