可调导叶对气悬浮离心压缩机及系统性能影响研究  

Study on the Influence of Variable Inlet Guide Vanes on the Performance of Centrifugal Compressor and Refrigeration System with Gas Bearings

作　　者：宋君楠 巩捷明 刘义腾 刘广彬 Song Junnan;Gong Jieming;Liu Yiteng;Liu Guangbin(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao,266061)

机构地区：[1]青岛科技大学机电工程学院,青岛266061

出　　处：《制冷与空调（四川）》2023年第2期202-209,共8页Refrigeration and Air Conditioning

基　　金：国家自然科学基金项目(52176010)。

摘　　要：离心压缩机作为离心式冷水机组的核心设备,被广泛应用于大型制冷空调系统、工业制冷等领域。由于气悬浮轴承具有成本低、无需主动控制等优点,使气悬浮离心式制冷压缩机成为近年研究热点及重要发展方向。针对气悬浮双级压缩制冷系统,建立了离心压缩机模型,且在第一级压缩机进口安装可调导叶,通过CFD的方法,模拟了变导叶开度下压缩机及系统性能。结果表明,采用可调进口导叶能够改善压缩机内部流场,导叶开度为正时,压缩机的喘振流量以及最高效率点的流量向小流量方向偏移,反之则向大流量工况偏移。蒸发温度相同、压缩机出口流量固定时,不同导叶开度下系统的COP随中间补气量的增加而降低,导叶开度改变了压缩机工作压比,进而间接影响系统工况及COP。不同导叶开度下系统的COP随工作压比的增加而降低,当工作压比小于2.4时,导叶开度为20°时系统的COP最高。As the core equipment of centrifugal chiller,centrifugal compressor is widely used in large refrigeration air conditioning system,industrial refrigeration and other fields.Because the gas bearings has the advantages of low cost and no active control,the gas bearings centrifugal refrigeration compressor has become a research hotspot and an important development direction in recent years.In this paper,a centrifugal compressor model was established for the gas bearings two-stage compression refrigeration system,and variable guide vanes were installed at the inlet of the first-stage compressor.The compressor and system performance under different variable guide vanes openings were simulated by CFD method.The results show that the flow field inside the compressor can be improved by using the variable inlet guide vanes.When the opening of the guide vanes is positive,the surge flow and the flow at the highest efficiency point of the compressor shift to the direction of small flow,and otherwise shift to the condition of large flow.When the evaporation temperature is the same and the compressor outlet flow is fixed,the COP of the system decreases with the increase of the intermediate air supply under different guide vanes openings.The guide vanes opening changes the compressor operating pressure ratio,which indirectly affects the system operating conditions and COP.The COP of the system decreased with the increase of operating pressure ratio under different guide vanes openings.When the operating pressure ratio was less than 2.4,the COP of the system was the highest when the guide vanes opening was 20°.

关 键 词：可调导叶 气悬浮 离心压缩机 制冷系统 

分 类 号：TB652[一般工业技术—制冷工程]