Impact of central versus side jet impingement configurations on the cooling of a gas turbine leading edge at varying reynolds numbers and rotational speeds: experimental investigations

This experimental study investigated the cooling performance of two jet impingement configurations central and side. The effects of Reynolds numbers ranging from 5000 to 11,000 and rotation speeds ranging from 0 to 200 rpm on the total heat transfer performance represented by the averaged surface Nusselt Number were investigated for central and side jet configurations. At a high rotation speed, the side jet configurations displayed a greater average Nusselt number than the central jets. At a low rotation speed, both layouts yielded similar average Nusselt numbers. For the central jets, increasing the rotation speeds marginally increased the average Nusselt number. Meanwhile, for the side jets, it resulted in a considerable increase in the average Nusselt number. At a low rpm and in both configurations, the average Nusselt number increased with the Reynolds number. At high rotational speeds, the average Nusselt number increased slightly for the central jet arrangement. However, for side jet configurations, increasing the Reynolds number marginally reduced the average Nusselt number. The experimental results show the effects of various parameters on jet impingement cooling, provide information on optimal heat removal for maximizing thermal effectiveness, and aid in assessing the influences of side and central layouts on the overall heat transfer performance and average Nusselt number.