攻角对平面扩压叶栅叶根流动影响的分析

对静子容腔和三级封严篦齿结构的平面扩压叶栅进行数值计算,主要从泄漏流结构、叶栅总压损失、叶片载荷等角度分析在不同的来流攻角下各个参数对叶根流动的影响。结果表明:不同的攻角下,叶根角区的流动存在明显的差异,负攻角时的叶根角区流动状况较好,9°攻角时,泄漏流在尾缘处产生最为严重的分离。泄漏流的占比随着攻角的增大呈线性增长,各S3截面的总压损失并没有明显的线性关系。攻角为4°时,载荷最大,此时叶栅的扩压能力最强,总压损失最小。

Analysis of Effect of Attack Angle on Root Flow in Plane Diffuser Cascade

Numerical calculations are performed on the plane diffuser cascade of the static cavity and the three-stage sealed spur tooth structure.The influence of each parameter of the attack angles of leakage flow structure,total cascade pressure loss,and blade load on the root flow is analyzed.The results show that there are obvious differences in the flow of the leaf root angle region under different angles of attack.The flow condition is better when the angle is negative.When the angle of attack is 9°,the leakage flow will cause the most serious separation at the trailing edge.The proportion of the leakage flow increases linearly with the increase of the angle,and the total pressure loss of each S3 section has no obvious linear relationship.When the angle is 4°,the load is the largest,and the cascade has the strongest pressure expansion capability and the smallest total pressure loss.