Experiment of impingement heat transfer characteristics in dimpled wedge channel

In order to obtain the hot air anti-icing properties of engine inlet strut, an impingement heat transfer experiment was carried out in a dimpled wedge channel with use of transient thermochromic liquid crystal measurement technique. The effects of jet Reynolds number (Re), distance between jet entrance and dimple, dimple space and the number of dimple rows on Nusselt number (Nu) were studied. The results shows that Nu increases with the increasing Reynolds number, and the heat transfer of dimpled wall is stronger than that of smooth wall. Local Nusselt number reaches a maximum at the trailing edge of the dimple. The average heat transfer effect of side walls increases when the dimple space decreases. When the dimples are close to the outlet, there is an obvious enhancement to the side wall Nu at small Re, while the heat transfer at the leading edge is enhanced at relative large Re. When the number of dimple rows increases, the average Nu increases.