基于正交试验的涡流发生器传热特性结构数值分析

为进一步提高管壳式换热器壳程换热效率，设计了一种布置于壳程肋片上的仿生鸟喙式涡流发生器。采用ANSYS FLUENT软件结合田口正交试验模拟了矩形通道中鸟喙式涡流发生器的传热特性，分析了纵向高度、斜截角度、迎流攻角、入口距离、流向间距5种结构参数对强化传热和综合热性能的贡献率及最佳结构组合。流动通道为长方体，其长、宽、高分别为1 600，240和40 mm，温度为286.86 K的空气流体从入口以1.491~3.195 m/s的速度流入，通道底部为337.048 K的恒温换热面。结果表明：纵向高度对于强化换热特性的贡献率最高，达到4744%，最强换热效果组合的换热因子较空矩形通道提高了185.71%；迎流攻角对于综合热性能的贡献率最高，达到了总占比的31.35%，利用正交试验分析得到的最强组合较空通道的综合热性能提高了47.82%

Numerical Analysis of Heat Transfer Characteristics of Vortex Generator Structure based on Orthogonal Test

In order to further enhance the heat transfer efficiency of the shell side of a shell and tube heat exchanger, an innovative biomimetic beak shaped vortex generator (BSVG) was designed and positioned on the inner surface of the ribbed shell. Utilizing ANSYS FLUENT software in conjunction with Taguchi orthogonal experimental design, the heat transfer characteristics of BSVG in the rectangular channel were simulated. The contribution rate and optimal structural combination of five structural parameters, namely longitudinal height, oblique angle, angle of attack, inlet distance and flow spacing, to the enhancement of heat transfer and comprehensive thermal performance were analyzed. The dimensions of the rectangular channel model were 1 600 mm in length, 240 mm in width and 40 mm in height. Air fluid entered the channel at a velocity of 1.491 m/s to 3.195 m/s and a temperature of 286.86 K. The constant temperature heat transfer surface at the bottom of the channel was at 337.048 K. The results show that longitudinal height has the highest contribution rate to the enhancement of heat transfer characteristics, accounting for 47.44% of the total ratio. The heat transfer factor of the optimal combination of BSVG is 185.71% higher than that of the empty rectangular channel; angle of attack has the highest contribution rate to the comprehensive thermal performance, accounting for 31.35% of the total ratio. The optimal combination obtained through Taguchi orthogonal experimental analysis improves the comprehensive thermal performance of the channel by 47.82% compared with that of the empty channel.