【摘要】 利用数值模拟手段研究了非定常来流条件下负荷分布形式对边界层发展的影响,探讨了适合低雷诺数条件下低压涡轮的负荷分布形式。结果表明,后加载形式在较低雷诺数情况下有利于控制边界层发展,并且尾缘处的分离能够有效地被上游尾迹抑制,与前加载和均匀加载叶型相比,其气动损失最小。当雷诺数降到很低时,仅靠尾迹的作用难以有效抑止分离。结果还显示:在同样条件下,尾迹强度增大有利于控制边界层的分离。更多还原

【Abstract】 Effect of loading distribution on boundary layer development with unsteady inflow condition was investigated by numerical simulation, in order to find out the adapted loading distribution for low pressure turbines working at low Reynolds number. The results show that at low Reynolds number the aft loading distribution is of avail to control boundary layer development and the separation near trailing edge can be suppressed by upstream wake, so the losses are minimum compared with forward and uniform loading distribution. When Reynolds number decrease to a very low level, separation can hardly be suppressed only by wake. The results also show that at the same condition stronger wake has more ability to suppress separation.更多还原