涡流发生器选择性布置方式对换热器性能影响

Effect of Selective Arrangement of Vortex Generator on Heat Exchanger Performance

为提高换热器性能,在雷诺数Re为500~3000范围内,通过数值模拟方法研究三角翼涡流发生器的15种不同布置方式对平直翅片管式换热器的传热和流阻特性影响。结果表明:在涡流发生器布置排数相同时,涡流发生器越靠近迎风侧,换热因子j提升幅度越大;所研究的15种排列j/j_(R)均随Re数的增大而增大。大部分情况下的f/f_(R)随着Re数的增大而增大。换热器迎风侧前两排加装涡流发生器(即case B1布置方式)的翅片管式换热器的α_(JF)(评价系数JF)提高了10.15%~11.12%,综合性能最佳。

In order to improve the heat exchanger performance,the effects of 15 different arrangements of delta-wing vortex generators on the heat transfer and flow resistance characteristics of a flat finned tube heat exchanger are investigated by numerical simulation in the range of Reynolds number 500-3000.The results show that the closer the vortex generator is to the windward side,the higher the Colburn factor j is when the number of rows of vortex generators is the same,and the j/j_(R) of the 15 arrangements under study increases with the increase of the number of Re.The f/f_(R) in most cases increases with increasing Re number.The fin-and-tube heat exchanger with the first two rows on the windward side of the heat exchanger retrofitted with vortex generators(i.e.,case B1 arrangement)has the best overall performance with an increase in α_(JF)(evaluation coefficient JF)of 10.15%to 11.12%.