摘要
利用流程矩阵建立适用任意流路连接方式的翅片管换热器稳态性能仿真模型并且模拟换热器在干、湿工况下的性能。在有分支流路的情况下,采用流量自适应方法调节各支路流量并平衡各支路压降。模型中采用预测性能好的Gungor和Shah换热关联式和Müller-Steinhagen and Heck压降关联式,换热器空气侧考虑翅片不同形式而选取不同换热关联式以提高仿真模型精度。该模型仿真结果与文献中数据进行对比并模拟分析风速均匀性的影响。结果显示仿真程序预测的沿程管壁温度变化趋势和实验值一致,换热量误差在±10%以内,压降误差在±20%以内。在风速均匀和非均匀的条件下进行仿真计算,结果显示在非均匀风速条件下的换热量要小于均匀风速条件下的换热量,并且非均匀风速条件下的模拟结果与实验结果吻合度更高。
Setting up the steady-state performance simulation model of the finned tube heat exchanger whose connecting mode in pipeline is arbitrary by using the process matrix, and simulating the performance of the heat exchanger in the dry and wet conditions. Using the flow adaptive method to adjust the mass flow of each branch and balance the pressure drop of each branch under the condition of branch flow path. In the model, the Gungor and Shah heat transfer correlations and the Müller-Steinhagen and Heck pressure drop correlation which could predict the performance well are used. The different forms of fins in air side of the heat exchanger select different correlations in order to improve the accuracy of the simulation. The simulation results of this model are compared with the data in the literature and the influence of wind speed uniformity is simulated and analyzed. The results show that the temperature trend of the wall along the wall is consistent with the experimental value. Heat transfer error is within ±10 %, the pressure drop within error ± 20 %. The heat transfer under the condition of non-uniform wind speed is less than the heat transfer under the uniform wind speed condition, and the simulation result under the condition of non-uniform wind speed is more consistent with the experimental result.
作者
马腾飞
张笛笛
李刚
刘玉清
田晓亮
MA Teng-fei;ZHANG Di-di;LI Gang;LIU Yu-qing;TIAN Xiao-liang(School of Mechanical and Electrical Engineering,Qingdao University,Qingdao 266000,Shandong,China)
出处
《科技视界》
2018年第11期180-184,111,共6页
Science & Technology Vision
关键词
管翅式换热器
计算机模拟
管路布置
风速均匀性
Finned tube heat exchanger
Simulation
Pipe arrangement
Wind speed uniformity
