Due to the effects of inertia and diffusion, the droplets impact to the blades and deposit on the blade surface to form water film, when the wet steam flows in cascade passage.

• 湿蒸汽在叶栅通道内运动时，由于惯性和扩散作用，水滴会撞击并沉积在叶片表面上，形成水膜。