Numerical investigation of inclined sinusoidal-corrugated target plates for enhancing flow and heat transfer in jet-to-crossflow impingement system

Array jet impingement cooling is an advanced internal cooling technique that enhances wall heat transfer and mitigates overheating-induced failures in high-pressure turbine guide vanes. However, jet-induced crossflow reduces jet penetration, diminishing wall heat transfer efficiency. This study proposes a sinusoidal-corrugated target plate (CTP case) with the corrugation inclination angle (α) intentionally adjusted to regulate the streamwise velocity of the crossflow. Numerical simulations using the SST k-ω turbulence model are performed to compare the performance of the corrugated target plate (CTP case) and the smooth target plate (Baseline case). The influence of α on the flow field and wall heat transfer is discussed for Re from 8000 to 20,000. Additionally, two improved configurations, the CTP_CFD and CTP_CFU cases, are explored to enhance heat transfer performance in the downstream region. Ultimately, a combined corrugated target plate (CTP_OPT case) is proposed, significantly improving the overall thermal performance of the impingement system. The numerical results reveal that in the upstream target wall, the heat transfer process is dominated by impinging jets, whereas in the downstream region, crossflow plays a dominant role. Therefore, the cooling structure should be optimized accordingly. As α increases, the friction factor rises monotonically, while the wall heat transfer initially increases and then decreases. The CTP case with α = 22.5°exhibits the optimal overall thermal performance, showing an improvement of 37 %–42 % compared to the Baseline case. The CTP_OPT case, which combines the advantages of the CTP case with α = 0° and the CTP_CFD case, results in a 47 %–50 % improvement in overall thermal performance. Furthermore, it demonstrates an additional enhancement of approximately 5.7 % compared to the CTP case with α = 22.5°.