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将冲击冷却技术与肋化表面相结合,研究了一种具有微小W型肋的表面射流冲击冷却结构。通过稳态实验和瞬态热色液晶测试技术来探究光滑靶板和微小W型肋靶板的传热特性。测试时的冲击间距比为1.5,3和5,基于水利直径的雷诺数为15 000~40 000。结果表明:两种靶板的平均努塞尔数和压力损失均随雷诺数的增加而增加,随冲击间距比的增加而减小。当冲击间距比为1.5时,与光滑靶板相比,微小W型肋靶板的平均努塞尔数提高了5.1%~7.3%,压力损失却几乎不变。但当冲击间距比大于3时,由微小W型肋带来的强化传热效果并不显著。
Combining impingement cooling technology with a ribbed surface, a surface jet impingement cooling structure with tiny W-shaped ribs was studied. The steady-state experiments and transient thermochromatic liquid crystal test techniques were used to explore the heat transfer characteristics of the smooth target and the tiny W-ribbed target. The impact pitch ratio at test was 1.5, 3 and 5, and Reynolds numbers based on hydraulic diameter were 15 000 to 40 000. The results show that the average Nusselt number and pressure loss of two kinds of target plates increase with the increase of Reynolds number and decrease with the increase of impact pitch ratio. When the impact pitch ratio is 1.5, the average Nusselt number of micro W-type target increases by 5.1% ~ 7.3% compared with that of smooth target, and the pressure loss is almost unchanged. However, when the impact pitch ratio is greater than 3, the effect of enhanced heat transfer by the tiny W-shaped ribs is not significant.