摘要
在环形涡轮叶栅低速风洞上,对某型采用后部加载及正弯曲设计的高负荷动叶进行了静态吹风试验。应用五孔球型测针,详细测量了在3个冲角下由栅前至栅后7个横截面内气流参数沿叶高和节距的分布,同时对各冲角下9个不同叶高截面静压系数也进行了测量。试验结果表明,采用沿叶高改变吸力面最低压力点的后部加载叶型并结合叶片的正弯,能够在保持静压沿叶高分布均匀的条件下,显著降低端部横向压力梯度,增大主流区叶型的气动负荷。
In a low-speed annular cascade wind tunnel, static aerodynamic tests were performed on an aft-loaded and positively curved rotor blade cascade with high loading. With the application of five-hole pin ball, the flow parameters in seven cross sections along the blade height and pitch at three incidences were measured in detail from the front to the back of the blade cascade. In the mean time, the profile static pressure coefficients along blade height were also measured under the three incidences. The results showed that, with the application of the aft-loaded profiles with variable minimum pressure points along blade height and the blade positive curving to the design of rotor blade, the endwall transverse pressure gradient was reduced greatly and the aerodynamic loading on the blade profile in main stream region was increased, which not only decreased the secondary loss, but also enhanced the load bearing capacity of the blade cascade.
出处
《汽轮机技术》
北大核心
2011年第6期441-443,共3页
Turbine Technology
关键词
涡轮叶栅
高负荷
正弯叶片
后部加载
试验研究
turbine cascade
high loading
positive curving
aft-loading
experimental research
