Nian Wang, Mingjie Zhang, Sulaiman Alsaleem, Lesley M. Wright, Je-Chin Han

Frontiers in Heat and Mass Transfer (FHMT) 13 - 9 (2019)

This study investigates turbine blade, leading edge cooling from normal or tangential impinging jets. These jets impinging on a semi-cylindrical, inner surface are constrained to discharge in a single direction. The downstream jets are affected by the crossflow originating from the upstream jets. To understand the thermal flow physics, numerical simulations are performed using the realizable k-epsilon turbulence model. Both the experimental and numerical results show crossflow is more detrimental to normal impinging jets than the tangential jets.  Furthermore, with a significant temperature drop across the jet plate, designers must correctly interpret jet impingement results.