后加载叶型叶栅的三维压力场及其对损失发展的影响

Three-dimensional pressure distribution of the cascades with aft-loading profile and the influence of loss development

关键词:  后部加载+  导流叶片  压力分布  能量损失

Key words:  Aft-loading~+  Guide vane  Pressure distribution  Energy loss

摘要:

在低速环形叶栅风洞上对具有后部加载叶型的常规直叶片叶栅和弯曲叶片叶栅进行了吹风实验,得到了两种叶栅的叶片和上、下端壁表面的静压系数分布及气动性能。实验结果表明,后部加载叶型能够建立对应优良气动特性的叶栅内部三维压力场,同时采用弯叶片技术可进一步优化展向静压系数分布。

Abstract:

Detailed measurements of the low speed flow in annular turbine cascades were made to obtain the three-dimensional static pressure distribution and the aerodynamic characteristics of the two types of turbine cascades which have the aft-loading profile. One of them is the conventional straight blades cascade and the other is the curved blades cascade. The test results show that adopting the aft-loading technology can improve the 3D pressure distribution of the flow field, especially near the endwall area, and it would improve the static pressure coefficient distribution at spanwise farther by using the curved blades. Effectively matching the aft-loading profile and the curved blades can reduce the energy loss of the turbine cascade greatly.