船用换热器三维流场数值模拟

Numerical Simulation of the 3D Flow Field for Marine Heat Exchangers

采用Pro/E软件对闭式机舱淡水海水换热器的三维建模,利用FLUENT软件对该换热器壳程流体的流动与传热进行了数值模拟计算,分别以壳程总压降、总传热率、速度这三个方面作为综合衡量标准,分析具有不同折流板弦高、折流板数目的几种淡水海水换热器模型的速度场、温度场和压力场。结果表明:随着折流板数目的增加,壳程流体的压降逐渐升高,出口温度逐渐减小;随着缺口高度的增加,壳程流体的压降明显下降,出口温度也明显增加。

This paper develops a three-dimensional model of the closed engineroom heat exchanger by using the Pro/E software. Based on the obtained numerical model, the shell-side turbulent flow and heat transfer characteristics of the examined heat exchanger is analyzed with the aid of the Computational Fluid Dynamics （CFD） software Fluent. Particularly, by taking the shell-side pressure drop, the total heat transfer rate, and the flow rate as three comprehensive indicators, the field of velocity, temperature, and pressure of the heat exchanger under different baffle nick heights and numbers are investigated. The results show that as the segmental baffle number increases, the pressure drop at the shell-side rises and the outlet temperature drops; meanwhile, when the baffle nick height increases, the pressure drop decreases and the outlet temperature increases.