管壳式换热器折流板对换热性能影响的数值模拟

Influence of Baffle of Shell-and-tube Heat Exchanger on Heat Transfer Performance Numerical Simulation

由于传统弓形折流板换热器设计简单、适应性强被广泛使用于各类生产活动中。但是传统弓形换热器的换热性能较差以及壳程压损较大等缺点对企业效益产生不利影响。因此传统弓形折流板换热器结构优化对于工程实践来说意义重大。采用CFD软件Fluent对四块上下布置的弓形开孔折流板管壳式换热器进行数值模拟。通过对模拟结果的对比分析,我们发现,开孔折流板温度场以及压力场分布较为均匀;未开孔折流板背部易引发流动死区,且范围伴随着入口速度的增加而增加;开孔折流板形成的射流会增强折流板背部的扰动,有助于强化换热。

Due to the simple structure and strong adaptability of the traditional bow baffle heat exchanger,it is widely used in various production activities.However,the shortcomings of the traditional bow-shaped heat exchangers,such as poor heat exchange performance and large shell-side pressure loss,have an adverse effect on the company's efficiency.Therefore,it has important engineering significance for the structural optimization of the traditional bow baffle heat exchanger.The CFD software Fluent was used to simulate the four-arc open-hole baffle shell-and-tube heat exchanger.Through the comparative analysis of the simulation results,we found that the temperature field and pressure field distribution of the open-hole baffles are more uniform than that of the non-perforated baffles;the back of the non-perforated baffles is prone to the retention zone,and with the inlet temperature The increase of the increase;the jet formed by the open-hole baffle increases the disturbance of the back of the baffle,which is beneficial to enhance heat transfer.