Numerical investigation on the heat transfer performance of array jet impingement cooling with sinusoidal-corrugated target plate

Abstract

Array jet impingement cooling is a prevalent method for the thermal management of high-pressure turbine guide vanes. Nevertheless, cooling efficiency is often compromised by the diminished jet penetration resulting from accumulated crossflow. This study introduces a sinusoidal-corrugated target plate designed to enhance jet impingement cooling by mitigating jet-to-crossflow interactions. A comparative analysis was performed to evaluate the flow and heat transfer performance of the flat plate (Baseline case) and the sinusoidal-corrugated plate (CTW case) using numerical simulations with the SST k-ω turbulence model. The effects of the ripple period (T/Xj) and amplitude (A/D) are discussed under various Re. Additionally, two optimized corrugated target plates (OCTW1 case and OCTW2 case) are proposed to augment the heat transfer uniformity of the CTW case. The numerical results indicate that all CTW cases, compared to the Baseline case, improve the comprehensive thermal performance (TPF) of the jet impingement system. When T/Xj ranges from 0.1 to 0.5, the area-averaged Nusselt number (Nuavg) consistently increases as T/Xj decreases, while the maximum friction factor (f) is observed at T/Xj = 0.25. The CTW case with T/Xj = 0.1 and Re = 8000 has the highest TPF of 1.27. As A/D increases, Nuavg, f, and TPF gradually increase. However, the CTW cases with T/Xj values of 0.25 and 0.375 show almost unchanged or slightly reduced TPF due to increased f and nearly unchanged Nuavg. Both the OCTW1 case and the OCTW2 case improve wall heat transfer uniformity. At a Re of 2,000, the OCTW2 case demonstrates a 3.2 % higher TPF than the CTW case with T/Xj = 0.1 and A/D = 0.8/4.5.