关键词: 冲击冷却;旋流冲击冷却＋;传热系数;流动阻力;热均匀性＋

Abstract: Numerical simulations for the flow and heat transfer of vortex and normal impingement cooling on the internal channel of blade leading edge were carried out to find better cooling configuration. Comparisons were made between these two cooling forms in such aspects as vortex structure, heat transfer enhancement, pressure loss, thermal performance and thermal uniformity. The influences of Reynolds numbers and spaces between impingement holes on these parameters were studied. Results show that the heat transfer rate is enhanced and the thermal uniformity is improved by the swirl flow created by vortex impingement. Comparing vortex impingement with normal impingement at the range of Reynolds number from 2×10⁴ to 7.78×10⁴ and spaces between impingement holes from 3.3 to 5 times diameter, the averaged heat transfer rate is increased by 18％～34%, and the increment goes up with the increase of Reynolds number and impingement spacing. Pressure loss is increased by 10％～26%, and the increment goes down with the increase of Reynolds numbers and impingement spaces. The thermal performance parameter is increased by 20%, and the thermal uniformity is improved by 60%.

Key words: Impingement cooling; Vortex impingement cooling＋; Heat transfer rate; Pressure loss; Thermal uniformity＋