不同密度（质量）的粒子，在叶轮内部会出现分层现象，密度大于水的粒子都有向叶片工作面运动的趋势。
All of their trajectories of the particles whose density was bigger than that of water were finally shifted toward the pressure side of the blade.
而相邻原机件叶片弦宽尺寸超差，锯齿形工作接触面积小，以及非工作面局部碰磨，是引发故障的次要因素。
Other causes include the out - of - tolerance of blade chord width between adjacent blades, the undersize contact area of serrated working side and the local wearing of non - working side.
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