船用管壳式冷凝器入口流场均匀化性能研究

Research on Inlet Flow Field Homogenization in Ship Shell Condenser

为了解决某型船用管壳式冷凝器壳程存在流动分布不均的现象,提出在壳程进口下方添加防冲板的方案。通过采用Ansys CFX建立了冷凝器壳程三维流动换热模型,改变流场分布,达到强化换热的结果。并搭建了冷凝器测试系统,通过实验研究了不同工况下冷凝器添加防冲板前后的换热性能,验证了防冲板的强化换热效果。结论如下:改进后的冷凝器压降平均提高,壳程壁面冷凝换热系数ho随雷诺数增大平均提高了19. 6%。当壳程雷诺数Re=17 900时,改进后的冷凝器ho提升了31. 4%,综合性能相比于原结构提高了6. 8%。

In order to improve the non-uniform distribution of flow in the shell side of a horizontal marine shell and tube condenser,an Impingement Plate is added below the shell inlet.A three-dimensional condensation heat transfer model of shell side is proposed by CFX to enhance the heat transfer effect by changing the flow field distribution,and a condenser test system is set up.The heat transfer performance before and after adding the optimal Impingement Plate to the condenser under different operating conditions is comparatively studied through experiments.The strengthening effect of the Impingement Plate was verified.The conclusions are as follows:the pressure drop of the condenser is increased,and the condensation heat transfer coefficient ho on the shell side increases by an average of 19.6% with increasing Reynolds number.When shell-shell Reynolds number Re=17900,the improved condenser ho increased by 31.4% and overall performance increased by 6.8% compared to the original structure.