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不同出口角度扩压器的内部流动及离心压缩机级性能数值研究
赵志伟,苏永升
0
(华东理工大学承压系统与安全教育部重点实验室, 上海 200237)
摘要:
以某多级离心压缩机首级为研究对象,运用数值模拟方法研究扩压器出口安装角对压缩机级性能的影响,得出不同出口安装角情况下压缩机单级的性能曲线,并分析扩压器内部流动特点和损失机理,通过压力恢复系数Cp对比不同流量下不同扩压器的扩压效果。结果表明,当扩压器出口安装角增大时,性能曲线向大流量区移动,最高效率和压比先升高后降低;不同出口角度下叶片扩压器的扩压效果由不同工况下的流动特性决定;在大流量下,不同出口角度下扩压器叶背形成分离区且旋涡位置不同;在小流量下,具有较大出口安装角的扩压器叶腹率先出现分离区。
关键词:  叶片扩压器  出口安装角  性能曲线  压力恢复系数
DOI:10.14135/j.cnki.1006-3080.2017.02.019
投稿时间:2016-06-21
基金项目:
Numerical Study of the Different Outlet Angles of Diffuser and Performance of Centrifugal Compressor
ZHAO Zhi-wei,SU Yong-sheng
(Key Laboratory of Pressurized Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China)
Abstract:
Based on the first stage of centrifugal compressor,the effects of outlet angles of diffuser on the stage performance were investigated by the numerical simulation.The performance curves at stage with different outlet angle were measured.The internal flow and the total pressure loss on the stage were analyzed,and by comparison of pressure recovery coefficient of different vaned diffusers to judge diffusion effect.The results show that the increase of outlet angle makes the performance curve move toward the large flow rate side,and the peak stage efficiency and pressure ratio increase firstly and then decrease.The diffusion effect of vaned diffuser depends upon flow condition during different operations.When the flow mass is larger than the design level,the separation zone generates near the shroud of diffuser,and the different vortex regions enlarge with the outlet angle of diffuser.When the flow mass is smaller than the design level,the separation zone is firstly emerged in large outlet angle at vaned diffuser.
Key words:  vane diffuser  outlet angles  performance map  pressure recovery coefficient

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