楔形凹腔内带前伸槽冲击板射流冲击换热

针对楔形凹腔内带前伸槽冲击板结构开展了传热特性的试验研究，分析了冲击板前伸槽伸出长度比（5~11）、前伸槽宽度比（2.5~8）和射流雷诺数（7900~31700）等参数对凹腔表面温度、展向平均努塞尔数和面积平均努塞尔数以及射流压力损失的影响.研究结果表明:相对于基准冲击板，带前伸槽的冲击板能够使得凹腔的射流冲击对流换热较基准冲击板有较大幅度的改善，但引起较大的射流压力损失；前伸槽伸出长度的增大使得凹腔表面射流冲击对流换热有较显著的增强，对射流压力损失的影响很小；增大冲击板前伸槽宽度可以使得凹腔表面对流换热得到一定程度的强化，但也会造成压力损失的增大. 

Impingement heat transfer inside wedge-shaped concave by jets from impingment plate with front-extended port

Experimental analysis was conducted to investigate the heat transfer inside a wedge-shaped concave by a row of jets from impingment plate with front-extended port.The effect of front-extended port extension spacing ratio (5 ～ 11),front-extended port width spacing ratio (2.5～8) and jet Reynolds number (7900～31700) on the concave surface temperature distribution,spanwised-averaged Nusselt numbers,area-averaged Nusselt numbers and jet pressure loss were experimentally tested.The results indicated that the convective heat transfer of impinging plate with front-extended port was obviously enhanced compared with baseline plate,the front-extended port caused high jet pressure loss.The convective heat transfer of concave surface was significantly improved with the increase of front-extended port extension spacing ratio,yielding little effect on jet pressure loss.Convective heat transfer of concave surface was enhanced with increase of front-extended port width spacing ratio,however,the total pressure loss increased also.