扰流柱对层板冷却叶片前缘传热影响的数值研究

Effect of Pin-fin on Heat Transfer of Leading Edge for Laminated Plate Cooling Blade

根据涡轮导向叶片进、出口条件,运用RNG k-ε湍流模型对简化的层板冷却叶片前缘部分进行数值模拟计算,比较了冲击双层壁和带有圆形、方形、菱形扰流柱的4种层板冷却叶片前缘的流动与传热情况。结果表明:冲击双层壁的总压损失与带扰流柱的层板冷却叶片前缘的相差不大;方形、菱形与圆形扰流柱的靶面换热系数分布相近,差别很小;带扰流柱的层板结构叶片前缘的冷却效率比冲击双层壁的前缘的高,其中方形扰流柱的前缘表面的冷却效率最高,菱形、圆形的次之。

According to the inlet and outlet condition of turbine blade, the leading edge of simplified laminated plate cooling blades was numerically simulated and calculated by RNG K-8 turbulent model. The heat transfer characteristics between impacting double wall and leading edge of laminated plate cooling blade with circular, square and rhombus pin-fins were compared. The results show that the total pressure loss of impacting double wall is similar to its leading edge of laminated plate cooling blade with pin-fins. The difference of target heat transfer coefficient for square, rhombus and circular pin-fins is little. The cooling effectiveness of the leading edge of laminated plate cooling blade with pin-fins is higher than that of impacting double wall, and the effectiveness of square pin-fin is higher than that of circle and rhombus pin-fin.