Abstract: In this paper direct measurements were made to investigate the water jet impingement at the higher temperature curved surface. Heat transfer coefficient at the stagnation point and local area was obtained through the experimentation.The effects of jet impingement exit velocity,nozzle-to-surface spacing and other correlative parameters were investigated in detail.The result showed that the heat transfer coefficient at the stagnation point was higher than at other areas,and it decreased with increasing X/D, but increased with increasing exit velocity.The nozzle-to-surface spacing showed some effect on heat transfer coefficient at a lower exit velocity.

摘要： 采用直接表面温度测量的方法对水喷射高温曲面的传热过程进行实验研究.通过实验得到了驻点区及附壁射流区的对流传热系数的分布情况，并且系统地研究了射流出口速度、喷嘴至加热面的间距等参数对对流传热系数的影响.结果表明，圆形射流冲击曲面的局部传热系数沿传热面随X/D的增大而逐渐减小，驻点处的传热系数最大并且随射流速度的增大而增大，但是当射流速度增大到一定值时，驻点的对流传热系数的增大比较缓慢.在射流速度较低的情况下，喷距对局部传热系数的影响较为显著.