【摘要】 利用COMSOL软件模拟研究了单狭缝射流对高温运动板的稳态传热特性。研究结果显示,当射流-板间距H/W在0.2—2区间变化、板速-喷嘴射流速度比R_sj（s为目标板,j为射流）在0—1区间变化时,小间距射流通过抑制次级涡,在运动板边界层形成高速贴壁射流以输运热质。观察到小间距时局部努塞尔数曲线的次级峰,其在运动板下游的传热增强显著。随着H/W的增大,R_sj严重影响局部努塞尔数曲线峰的位置和数量。此外,在层流和湍流对比中,其传热差异明显。且在高速湍流中,H/W≤0.4时的传热效果显著。更多还原

【Abstract】 COMSOL software was used to simulate and study the steady heat transfer characteristics of a single slit jet on a high temperature moving plate. The results show that when the jet-plate spacing H/W varies from 0.2 to 2 and the plate velocity-nozzle jet velocity ratio R_sj（s is the target plate and j is the jet） varies from 0 to 1, the low jet-to-plate distance jets suppress the secondary vortices and form high-speed adherent jets in the boundary layer of the moving plate to transport heat and mass. The secondary peak of the local Nusselt number curve at small spacing is observed, and its heat transfer downstream of the moving plate is significantly enhanced. With the increase of H/W, R_sj seriously affects the position and number of peaks of local Nusselt number curve. In addition, in the comparison of laminar flow and turbulent flow, the difference in heat transfer is obvious. Moreover, in high-speed turbulent flow, the heat transfer effect is remarkable when H/W≤0.4.更多还原