基于流固耦合模型的制冷压缩机排气回流研究  

Research on outlet backflow of refrigeration compressor based on fluid-structure interaction model

作　　者：王俞 金华强[1] 顾江萍[1] 黄跃进[1] 孙哲 王新雷 郑爱武 沈希[1] Wang Yu;Jin Huaqiang;Gu Jiangping;Huang Yuejin;Sun Zhe;Wang Xinlei;Zheng Aiwu;Shen Xi(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310032;Department of Agricultural and Biological Engineering,University of Illinois at Urbana-Champaign,Urbana IL 61801,USA;JiaXiPera Compressor Co.Ltd.,Jiaxing 314006)

机构地区：[1]浙江工业大学机械工程学院,杭州310032 [2]伊利诺伊大学香槟校区农业与生物工程学院,乌尔班纳IL61801,美国 [3]加西贝拉压缩机有限公司,嘉兴314006

出　　处：《高技术通讯》2020年第7期724-734,共11页Chinese High Technology Letters

基　　金：国家自然科学基金(51076143);浙江省基础公益研究计划项目(LGG18E050024,LGG19E050020)资助。

摘　　要：排气回流对往复式制冷压缩机能效具有重要影响。排气回流因排气阀片运动与气体流场相互作用而产生,因其位置、速度、流场等因素,难以对其进行准确测量。本文建立了制冷压缩机流固耦合模型,对阀片运动和制冷工质在压缩机内的循环过程进行数值模拟,并通过实验平台验证了模型的准确性。基于流固耦合模型,研究了不同压缩比、不同转速和不同限位器高度下排气回流的变化规律,对排气回流流量进行了定量求解。仿真结果表明,压缩比越大排气质量流量越大,限位器高度越高排气回流量越大,此外,转速变化对压缩机排气回流影响较大。运用流固耦合模型,结合阀片动态特性,分析流量、流速变化,为制冷压缩机优化提供了新思路。Outlet backflow has an important impact on the energy efficiency of reciprocating refrigeration compressors.The outlet backflow occurs when discharge valve and flow-field interact with each other.Influenced by positon,velocity and flow-field,it is hard to measure the outlet backflow accurately.The fluid-solid interaction model of refrigeration compressor is established.The numerical simulations conducted to characterize the circulation of valve motion and refrigerant process of the refrigerant in the compressor is carried out.The accuracy of the model is verified by the experimental platform.Based on the fluid-solid interaction model,the outlet flow of the compressor can be quantitatively calculated.The variation of outlet backflow under different compression ratios,different speeds and different limiter heights is studied.The simulation results show that the greater the compression ratio,the greater the exhaust mass flow,and the higher the stopper height,the greater the exhaust return flow.The change of the speed has much influence on the compressor outlet backflow.The fluid-solid interaction model combines the dynamic characteristics of the valve plate to analyze the flow and flow rate changes,which provides a new methodology for the optimization of the refrigeration compressor.

关 键 词：制冷压缩机 排气回流 流固耦合 延时关闭 回流流量 

分 类 号：TB652[一般工业技术—制冷工程]