论文部分内容阅读
为利用端部孔隙结构控制叶栅二次流损失,对一种端部孔隙结构在不同攻角下对透平静叶栅内部流场的影响进行数值模拟。结果表明:大负攻角下,该孔隙结构有效地控制了透平叶栅头部压力面的分离泡,减少了损失;在其他攻角下,该结构对该文考察的叶栅没有表现出明显的改善作用。结合该孔隙结构和另一种由原始叶型优化后的叶片进行联合造型,对其在不同攻角下的性能进行了考察。经联合造型后的叶栅与原始叶栅相比在各个攻角下的流动损失均有大幅度降低,大负攻角下效果尤为明显。
In order to control the secondary flow loss of the cascade by using the end pore structure, the numerical simulation of the influence of the end pore structure on the flow field inside the turbine stationary blade cascade at different angles of attack is carried out. The results show that under large negative angle of attack, the pore structure effectively controls the separation bubble on the pressure surface of turbine cascade and reduces the loss. At other angles of attack, the structure does not show the cascade Significant improvement. Combined with the pore structure and another from the original leaf-type blades optimized joint shape, its performance under different angles of attack were investigated. Compared with the original cascades, the cascaded cascades show a significant reduction in flow losses at all angles of attack, especially at large negative angles of attack.