Heat Transfer Augmentation With Multiple Jet Impingement Cooling on Dimpled Surface for Gas Turbine Blades

Abstract Multiple jet impingement cooling plays a significant role in the leading-edge cooling of the gas turbine blade. The heat transfer enhancement with this method depends on stand-off distance, nozzle array arrangement, surface roughness, a dimpled surface, a curved surface, etc. This study has developed a numerical simulation model to investigate heat transfer and flow behavior on a dimpled surface. The comparison was made with the conventionally designed dimple and a newly designed-leaf dimple. Computational fluid dynamics plays a significant role in representing the precise flow and heat transfer behavior. This study analyzed the results based on Nusselt number, Reynolds numbers, pressure drop, friction factor, surface roughness of the target plate, and thermal performance. The hemispherical dimpled target plate shows 5–10% more efficiency than the smooth target plate. The leaf target plate shows 2–6% more efficiency compared to the hemispherical dimpled target plate