刘凯华,傅佳宏,陈晓飞,等.基于换热单元非均匀流动的换热器整体等效计算方法研究[J].内燃机工程,2022,43(3):11-18.
基于换热单元非均匀流动的换热器整体等效计算方法研究
Research on Equivalent Calculation Method of the Overall Heat Exchanger Based on Non-Uniform Flow of Heat Exchanger Units
DOI：10.13949/j.cnki.nrjgc.2022.03.002
关键词:紧凑式换热器  油冷器  跨尺度  多孔介质  数值模拟
Key Words:compact heat exchanger  oil cooler  trans-scale  porous media  numerical simulation
基金项目:浙江省自然科学基金项目（LQ20E060003）
作者单位E-mail
刘凯华* 浙江大学 动力机械及车辆工程研究所，杭州 310063 21927001@zju.edu.cn 
傅佳宏 浙大城市学院 机械电子工程学系，杭州 310015
浙江银轮机械股份有限公司，台州 317200 		 
陈晓飞 中国北方发动机研究所，天津 300400  
孙晓霞 中国北方车辆研究所，北京 100072  
张宇 浙大城市学院 机械电子工程学系，杭州 310015  
刘震涛* 浙江大学 动力机械及车辆工程研究所，杭州 310063 liuzt@zju.edu.cn 
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摘要:为了解决因翅片与换热器整体尺寸跨度较大、新型换热器设计过程中缺乏试验数据而难以进行换热器整体性能模拟预测的问题，提出了一种基于换热单元非均匀流动的油冷器等效计算方法。该方法利用油冷器单元模型进行数值模拟，从中提取出换热单元的流动与换热特性参数，将该参数代入简化为多孔介质的油冷器整体模型中进行等效计算。结果表明，该方法在大范围内获得与试验数值相一致的结果，换热功率平均误差在试验工况范围内为3.5%。此外，等效计算换热的准确性受到换热参数拟合精度的影响，该影响可通过增加单元换热模拟工况点得到改善。
Abstract:In order to solve the problem that the overall performance of heat exchanger could hardly be simulated due to the large scale range between fin and heat exchanger and the lack of experimental data， a equivalent calculation method based on non-uniform flow of heat exchanger unit was developed. With this method， the flow and heat transfer characteristic parameters of the heat transfer unit were extracted from an oil cooler unit model by numerical simulation. Then the parameters were brought into the equivalent calculation with the whole oil cooler model simplified as porous media. Results showed that the pressure drop and capacity of the oil cooler obtained by this method were consistent with the experimental data in a wide range. The average error of heat transfer rate was 3.5% in experiment conditions. The heat transfer accuracy of the oil cooler simulation was influenced by fitting accuracy of parameters of heat transfer， which could be improved by adding simulated working conditions of the heat transfer unit.
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