Cavitation can be formed on ship rudders, ship propellers and hydraulic system components and can induce erosion on solid surfaces. One of the remaining open questions in the study of the cavitation erosion is finding a method to control erosion generated by the collapse of single bubbles near a solid surface. In this study, we proposed a passive control method using a shark skin inspired micro structured riblet solid surface to control the dynamics of a single bubble collapse and the cavitation-induced erosion. We experimentally investigated the effects of a micro structured V-shaped riblets on the dynamics of a laser-generated single cavitation bubble. First, the dynamics of a single cavitation bubble near a smooth rigid surface is obtained at different relative wall distances. Second, the dynamics of a single cavitation bubble near a rigid surface covered by micro structured riblets are compared with our experiment on the smooth rigid surface for the relative wall distances. The results showed that the bubble dynamics collapsing near the riblet surface differed significantly from the single bubble collapse near the smooth surface. The interaction of microbubbles formed between the bubble and the riblet surface during the first collapse mitigated the momentum of the microjet. Furthermore, the riblet structure altered the bubble’s shape during its collapse and rebound process and significantly reduced the torus ring generated after the first and second collapses. The riblet structure also reduced the cavitation-induced erosion area on the rigid surface with the micro structured riblet.

汽蚀可在船舶舵、船舶螺旋桨和液压系统部件上形成，并可引起固体表面的侵蚀。空化侵蚀研究中剩下的一个悬而未决的问题是找到一种方法来控制固体表面附近单个气泡坍塌所产生的侵蚀。在这项研究中，我们提出了一种被动控制方法，使用受鲨鱼皮启发的微结构肋状固体表面来控制单个气泡坍塌和空化引起的侵蚀的动力学。我们通过实验研究了微结构 V 形肋对激光产生的单空化气泡动力学的影响。首先，在不同的相对壁距下获得光滑刚性表面附近单个空化气泡的动力学。第二，将被微结构肋覆盖的刚性表面附近的单个空化气泡的动力学与我们在光滑刚性表面上的相对壁距的实验进行比较。结果表明，在凹槽表面附近坍塌的气泡动力学与光滑表面附近的单个气泡坍塌有显着差异。在第一次坍塌期间，气泡和凹槽表面之间形成的微气泡的相互作用减轻了微射流的动量。此外，肋状结构在气泡坍缩和回弹过程中改变了气泡的形状，并显着减少了第一次和第二次坍塌后产生的环面。凹槽结构还通过微结构凹槽减少了刚性表面上的空化腐蚀面积。