双螺杆制冷压缩机工作过程的数值模拟  

Research on Characteristics of Twin-screw Refrigeration Compressor

作　　者：黄浩 吴华根[1] 应雯 张倍毓 林侃隆 熊保顺 HUANG Hao;WU Huagen;YING Wen;ZHANG Beiyu;LIN Kanlong;XIONG Baoshun(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049;State Key Laboratory of Compressor Technology,Hefei 230001)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]压缩机技术国家重点实验室,合肥230001

出　　处：《机械工程学报》2019年第24期197-202,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50806055);压缩机技术国家重点实验室s(压缩机技术安徽省实验室)开放基金(SKL-YSJ201805)资助项目

摘　　要：双螺杆制冷压缩机由于其独特的优势已被广泛应用,但由于其复杂的转子结构及型线设计,对该类压缩机的整体性能的预测一般采用一维数值模拟或经验方式得到,但是该类方法无法获得压缩机内部流体压力场和温度场的分布情况。根据试验用螺杆压缩机建立了三维模型,利用结构化动网格技术,通过CFD软件对双螺杆压缩机的内部流场进行了三维数值模拟,分析了流体在压缩机内部的流动及热力学参数分布状况,得到了压缩机内部压力场、温度场和速度场的分布规律。将三维数值模拟得到的P-V指示图及压缩机宏观性能参数与试验结果进行对比分析,发现模拟结果与试验数据基本一致,部分负荷时误差较大,误差最大的是绝热效率,为2.58%。数值模拟能够准确预测双螺杆压缩机的性能,并为压缩机设计提供了新的方法。Twin-screw refrigeration compressors have been widely used due to their unique advantages, but owing to their complex rotor structure and profile design. The performance of twin-screw refrigeration compressors is generally predicted by one-dimensional numerical simulation or empirical methods, but this kind of method cannot obtain the distribution of the fluid pressure field and temperature field inside the compressor. A three-dimensional model is established based on the experimental screw compressor. The internal flow field of the twin-screw compressor is simulated by CFD software using the structured dynamic grid technology. The flow and thermodynamic parameters of the fluid inside the compressor are analyzed. The distribution of the internal pressure field, temperature field and velocity field of the compressor is obtained. Comparing the P-V indicator diagram and the macroscopic performance parameters of the compressor obtained by three-dimensional numerical simulation with the experimental results, it is found that the simulation results are basically consistent with the experimental data. The error is large at part load, and the maximum error is the adiabatic efficiency, which is 2.58%. Numerical simulation can accurately predict the performance of twin-screw compressor and provide a new method for compressor design.

关 键 词：双螺杆制冷压缩机 CFD 数值模拟 热力学性能 P-V图 

分 类 号：TH455[机械工程—机械制造及自动化]