柴油机换热消音器换热及阻力特性数值研究  

Numerical simulation of heat exchange and resistance characteristics of heat exchanger in muffler of diesel engines

作　　者：明平剑[1] 袁猛 张文平[1] 杨钊 MING Pingjian;YUAN Meng;ZHANG Wenping;YANG Zhao(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China;China Resource Power Company Limited,Power generation Department,Tangshan 063200,China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [2]华润电力(唐山曹妃甸)有限公司发电部,江北唐山063200

出　　处：《哈尔滨工程大学学报》2019年第12期2010-2015,共6页Journal of Harbin Engineering University

基　　金：高技术船舶科研船用低速机工程(一期)研制项目(CDGC01-KT1401)

摘　　要：针对大型传热设备建模仿真网格数目过多,难以整体模拟来掌握其工作性能的问题,本文利用多孔介质模型和双组元换热器模型结合的方法对消声换热器内的流场进行数值模拟,研究了额定负荷下消声换热器的压力分布特征和传热特性。模拟结果表明:利用简化后的模型可以解决设备的仿真和流动的仿真问题,仿真与实验结果误差5%在以内;烟气在消音换热器的换热段区域的整体压力分布均匀并且沿着烟气流动方向压力不断降低,在进口段烟气扰动较大,在消声器段压降仅为整体压降的0.48%;该方法得到的消音换热器的模拟结果可以为导流板结构优化提供参考。The overall simulation of large-scale heat-transfer equipment is difficult due to the huge number of grids in the simulation model.To investigate the equipment′s pressure distribution and heat-transfer characteristics under the rated load,in this study,we conducted a simulation of the flow field in the heat exchanger of a muffler using porous-media and dual-cell heat exchanger models.The results show that the heat-transfer and flow simulation problems can be solved using the proposed simplified model,while keeping the error between the simulated and experimental results within 5%.The overall pressure distribution of flue gas in the heat-exchanger section of the muffler was found to be uniform,with the pressure decreasing along the flow direction of the flue gas.The flue gas disturbance is greater in the inlet section and the pressure drop in the muffler section accounts for just 0.48%of the overall pressure drop.The simulation results of the muffler′s heat exchanger obtained by this method can also serve as a reference for the optimization of the deflector structure.

关 键 词：消音器 换热器 压力分布 多孔介质 余热回收 阻力系数 导流板 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]