中文摘要：

对螺旋角为15°、20°的1／3椭圆螺旋折流板换热器进行数值模拟，研究连续搭接相邻折流板间三角区漏流对换热器传热及阻力性能的影响．通过分析换热器存在三角区漏流与堵住三角区无漏流模型的模拟计算结果可知：三角区漏流使壳侧流体流动短路现象严重；三角区漏流使换热器整体传热系数、壳程压降、综合性能降低；堵住三角漏流区后，传热系数增加8．5％～11％，壳程压降增加幅度不大，综合性能增加8．1％～11．1％．

英文摘要：

A numerical simulation of trisection-ellipse heat exchangers with helical baffles is carried out, and the helix angles are 15°and 20° respectively, and we studied the impact of triangle leakage between continu- ously overlapped and adjacent baffles on heat transfer and resistance performance of heat exchangers. Through the comparative analysis about the simulation results of existing triangle leakage and that of blocking triangle area without leakage, the results show： triangle leakage makes a more serious short circuit flow for the shell-si- ded fluid; Triangle leakage makes heat transfer coefficient, shell-sided pressure drop and comprehensive per- formance of heat exchanger reduce. When triangle leakage is blocked, heat transfer coefficient increases by 8.5 % ～ 11% , shell-sided pressure drop increases marginally, comprehensive performance increases by 8.1% ～11.1%.