CO_2微通道气冷器的流场分解模拟及实验验证  

Decomposing Numerical Simulation and Experimental Verification of Carbon Dioxide Micro-channel Gas Cooler

作　　者：巫江虹[1] 李程[1] 杨兆光[1] 

机构地区：[1]华南理工大学机械与汽车工程学院广东省汽车工程重点实验室,广州510641

出　　处：《上海交通大学学报》2012年第3期474-479,共6页Journal of Shanghai Jiaotong University

基　　金：广东省教育部产学研项目(2009B090300380);广东省教育部产学研重点项目(2011A090200018);2011年广东省战略性新兴产业发展专项资金新能源汽车产业项目

摘　　要：为了研究CO2流量分配不均匀度对气冷器流动特性和传热特性的影响,建立了跨临界CO2制冷系统的微通道气冷器分解模型.实验结果表明：随着CO2制冷剂质量流量由110 kg/h增大到470 kg/h,扁平管内最大流量不均匀度由97%降低到18%,流量是影响不均匀度的重要因素;流量分配不均度对CO2微通道气冷器的流动特性影响明显,而对传热特性影响较小.比较了不同工况下相应的模拟结果与实验数据,平均换热系数误差为4.82%~38.25%,摩擦系数误差为6.09%~26.65%.In order to investigate the effect of CO2 mal-distribution in micro-channel on the flow and heat transfer characteristics of gas cooler,decomposing numerical model of micro-channel gas cooler in trans-critical CO2 system was constructed and experimentally verified.The results show that the maximum flow rate nonuniformity decreases from 97% to 18% as total inlet flow rate of CO2 increases from 110 kg/h to 470 kg/h,meaning that the flow rate is the critical factor of mal-distribution.The mal-distribution of refrigerant flux has a significant effect on the flow characteristics of micro-channel gas cooler.While to the heat transfer characteristics,its effect is not obvious.The numerical results were compared with the experimental data under different running conditions.The inaccuracy of average heat transfer coefficient ranges from 4.82% to 38.25%,and the inaccuracy of friction coefficient ranges from 6.09% to 26.65%.

关 键 词：分解数值模拟 微通道气冷器 二氧化碳跨临界循环 不均匀分配 

分 类 号：TB657.5[一般工业技术—制冷工程]