旋转螺桨叶面流场显形实验

本文介绍了旋转螺桨叶面流场显形实验。粘贴丝线在旋转桨叶表面作流场显形。从实验结果看,在桨叶由根到尖的五分之四部分,气流由前缘向后缘与弦线方向倾斜某个角度向外流动。而在桨叶尖部五分之一区域出现叶面气流分离和倒流现象,严重时甚至出现反向环流,从而产生负拉力使螺桨效率明显下降。 

SURFACE FLOW VISUALIZATION OF ROTATING PROPELLER

Surface flow visualization has been carried out with tufts adhered to the surfaces of the rotating propeller blades.From the experimental results it is found that in part of four fifths of blade surface from hub to tip,the air flow runs from leading edge to trailing edge in the outward direction with some inclination to chord.In the region of one fifth near the blade tip,flow separation and reverse flow occur at the blade surface,circulation appears even in the serious case,in consequence negative thrust emerges,which cuts down the efficiency of the propeller obviously.