旋转效应下射流冲击速度对换热的影响

Effect of Jet Velocity on Heat Transfer in the Vicinity of a Rotating Disk

采用数值计算方法模拟磨削工件表面的射流冲击对流换热过程,对不同射流冲击速度,考虑旋转盘诱导的气旋卷吸和射流冲击的耦合作用下,研究分析加热壁面的对流换热效果。在转盘诱导的气旋流动影响下,冲击射流向转盘和加热表面之间区域的侵入能力受到抑制,而射流速度的提高能够加强射流冲击的穿透力;在旋转盘诱导的气旋运动和卷吸作用下,空气射流冲击能有效改善磨削弧区的对流换热,且随着射流速度的增加,其强化对流换热的效果更显著。

Numerical simulation was carried out in the present paper to study the flow and heat transfer characteristics on a heated plate under the coupled action of cyclone flow near rotating disk and jet impingement,simulating the grinding process.The effects of jet velocity on convective heat transfer on the heated plate were analyzed.The results show that the penetration capacity of impinging jet into the contact area between rotational disk and heated surface is suppressed under the cyclone flow induced by the rotating disk.Increasing the jet velocity helps to penetrate the boundary near the rotating disk.The coupled action of cyclone flow and air jet impingement is benefit for convective heat transfer enhancement near grinding region,especially at higher jet velocity.