组合涡发生器在螺旋板式换热器上的强化传热研究

在螺旋板式换热器螺旋通道内设置三角翼和椭圆柱组合涡发生器,利用流体计算软件Fluent进行三维数值模拟。研究了Re为4000～7000内组合涡发生器对通道平均Nu和平均阻力系数f的影响,并应用场协同原理进行了分析。与只加装椭圆柱涡发生器的螺旋板式换热器进行对比,结果表明,纵向涡发生器产生的二次流能改善螺旋通道内的速度场与温度场的协同性,起到强化换热作用。在正三角形排列方式下,组合涡发生器通道的平均Nu比椭圆柱涡发生器的平均Nu增大8.7%,阻力因子f减小23.7%,强化换热的效果较好。

Heat transfer enhancement research on spiral plate heat exchanger with combination of vortex generator

The combination of delta wing and elliptical cylinder vortex generator in the spiral plate heat exchanger spiral chan- nel is installed, numerical simulation is conducted by using fluid CFD software. The effect of combined vortex generator on channel average Nu and the average drag coeflqcientf under Reynolds number from 4000 to 7000 are studied, and are also an- alyzed based on the field synergy principle. Comparing with the spiral plate heat exchanger of elliptic cylindrical vortex genera- tor, the results show that longitudinal vortex generator produces a two flow in a spiral channel which can improve the concert- edness of velocity field ancl temperature field and strengthen heat transfer enhancement effect. In the regular triangle arrange- ment, combination of vortex generator channel average Nu increases 8.7% than elliptic cylindrical vortex generator, resistance factorf decreases 23.7%, its heat transfer enhancement effect is better.