Experimental and numerical computation were conducted on impingement cooling in a narrow space with full-height pin fins turbulated flow

and the performance comparisons were made with another impingement cooling on the flat target plate under maximum cross flow scheme. The jet Reynolds number ranges from 15000 to 30000. Transient liquid crystal thermography method was used in the experiments to obtain the detailed impingement heat transfer distribution on the endwall of the target plates

and numerical computation was done to examine the flow structure and heat transfer characteristics in the impingement cooling systems. Experimental study shows that the pin-fin can slightly improve the average heat transfer characteristics on the endwall of the target plate by about 7.0%

and increase the pressure loss by about 17.9%. It is also found that heat transfer uniformity is also improved on the endwall of the target plate with pin fin. On the other hand

numerical computations still show that the wall jets and the upwashing vortex in the space strongly interact with the pin fins

and the pin fins appreciably increase the heat transfer area

therefore the impingement cooling system with pin fins has significantly improved the total heat transfer performance by about 27.0% compared with the impingement with the flat plate.