A Study on the Relationship between the Erosion Downstream of the Circular Cylinder and the Bubble Flow

抄録

It is well known that erosion appears behind a circular cylinder due to cavitating flows. It appears in the form of a row. Observation of a trailing bubble which entrains many small bubbles, and measurement of the wall pressure fluctuations were conducted to determine an intermittent spot erosion in the downstream direction. The mechanism the erosion in a row is attributed to slower contraction and re-expansion of the bubble, unlike that of the case of a single spherical bubble. Here, the cavitation flow generated two kinds of pressure shock: one affecting the side wall behind the model, and the other leading to an intermittent erosion in the wake.