变吸气工况R32涡旋压缩机湿压缩过程模拟研究  

Simulation research on wet compression process in R32 scroll compressor under different suction operational conditions

作　　者：孙帅辉[1] 郭鹏程[1] 孙龙刚 杨启超 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]合肥通用研究所压缩机技术国家重点实验室,安徽合肥230031

出　　处：《西安理工大学学报》2015年第3期282-288,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51406163);陕西省教育厅专项科研计划资助项目(14JK1541);陕西省自然科学研究计划资助项目(2015JQ5197);压缩机技术国家重点实验室开放基金项目

摘　　要：为降低采用R32工质的涡旋制冷压缩机在高温、高压比下的排气温度并提高其性能,建立了湿压缩模拟的压缩过程模型,结合两相泄漏模型和传热模型,对其在不同吸气工况下的工作过程进行了数值模拟。该模型以内能为求解参数,可自动判断流态,统一了两相和过热模型,将控制方程从5个降低到2个,简化了编程和求解。结果表明两相和过热工质的压缩特性明显不同,压缩过程中工质的最高温度高于排气温度。在吸气干度≥0.96时,两相工质在压缩过程前已变为过热,不会产生液击。随吸气名义干度的降低,存在最大制冷量和制冷系数(COP),分别位于吸气干度0.97和1.0处,相对吸气温度为35℃时,分别提高了4.2%和2.6%。该模型为预测和优化采用湿压缩的涡旋压缩机提供了一种有效手段。In order to reduce the discharge temperature and improve the performance of R32 scroll compressor,working under high temperature or high pressure-ratio condition,the simulation model is developed to describe the wet compression.Combined with the two-phase leakage and heat transfer models,the model simulates the compression process of the compressor under dif-ferent suction operational conditions.With the internal energy as the solution parameters,this model can automatically deduce the fluid state to unify two phases and superheated model to low-er the governing equations from 5 to 2,whereby simplifying the programming and solution see-king.The results indicate that the characteristic of two-phase compression is obviously different from that of superheated gas compression.The maximum temperature of refrigerant is higher than the discharge temperature.When the suction nominal quality is not smaller than 0.96,the two-phase work fluid is translated into superheated one before the compression process,so that the liquid slugging does not happen.With the decrease in suction nominal quality,the capacity and COP reach the maximum value at the suction quality 0.97 and 1.0,respectively.Compared to the value when the suction temperature is 35℃,the capacity and Coefficient of performance （COP）are improved by 4.2% and 2.6%,respectively.Therefore,the model provides an effec-tive method to predict and optimize the performance of scroll compressor with wet compression.

关 键 词：涡旋压缩机 湿压缩 制冷 两相流 模型 

分 类 号：TB652[一般工业技术—制冷工程] TH45[机械工程—机械制造及自动化]