摘要
在小转角透平叶栅中,端部横向二次流损失在总损失中占主要比例。对于此类叶栅采用倾斜叶片,压力面与端壁成锐角侧的流动能得到改善。采用压力面与两端壁均成锐角的正弯叶片,可将锐角侧的改善作用引入同一叶栅。对于大转角透平叶栅,上、下通道涡的形成、发展及汇合在叶栅中部产生的二次旋涡损失是总损失的主要部分。在这种情况下,要弄清叶片的倾斜是否仍能改善锐角侧的流动,叶片怎样弯曲才能减少二次旋涡损失,仅测量栅前与栅后流场是远远不够的,必须详细测量流道内部的流动。
With the five-hole spherical probes, a detail measurements of aerodynamic parameters for a traditional blade cascade and a lean blade cascade were carried in several transverse planes located ahead ,in and behind the cascade. The experimental results show that in the traditional blade cascade the growth and redistribution of energy losses depend on the evolution and development of passage vortices , and that in the side of obtuse angle between lean blade pressure surface and the endwall the passage vortex is weakened and controlled near the endwall, but in the side of acute angle the passage vortex is strengthened and develops to the midspan and other side.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1993年第2期146-150,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金
国家教委基金
