半球形结构对船用板式换热器性能的影响

Influence of Hemispherical Structure on the Performance of Marine Plate Heat Exchanger

设计一系列内置不同尺寸半球形凹坑结构的V字形板式换热器板片,利用ANSYS FLUENT软件探究各型板片的换热性能。数值模拟结果表明:加入半球形凹坑结构能使换热器触点周围高速流动区域流体的流动更均匀,并明显增大较宽流道区域内流体的流动速度,提升换热器的换热性能;随着结构尺寸增加,半球形结构内部流体的流动更剧烈,流道内流体受到的扰动作用更强,流道内的温度场、速度场和压力场的增幅越来越大。综合考虑扰流结构对传热效果的提升作用和摩擦因子的增加发现,Ⅳ型板片(凹坑半径为3 mm)的传热效果最佳,与传统板片相比,其传热效率提高24%。

A series of V-shaped plate heat exchanger plates with hemispherical pit structures of different sizes are designed,and the heat transfer performance of each plate is investigated by using ANSYS FLUENT software.The numerical simulation results show that the addition of the hemispherical pit structure can make the flow of the high-speed flow area around the heat exchanger contact more uniform,and significantly increase the flow velocity in the wider runner area.With the increase of the size of the structure,the temperature field,velocity field and pressure field in the runner are increasing more and more.Taking into account the enhancing effect of turbulent flow structure on heat transfer efficiency and the increase in friction factor,it is found that the IV type plate(with a pit radius of 3 mm)has the best heat transfer efficiency,with a 24%increase in heat transfer efficiency compared to traditional plates.