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.