Researches to Find New Resistible Materials Against Erosive Vortex Cavitation and Compound Erosion

The compound erosion, the coupling of abrasive wear and cavitation erosion, on affects the destruction of materials in many subtle ways.在本项目中，我们的研究重点是加速空化、流动空化和冲击射流空化对各种材料特性和液体质量的显着影响的侵蚀和磨损的严重作用，并重点阐明金属表面复合侵蚀的机理，其中非定常涡旋空化主要发生在涡轮机械的高速多相流中。从这些研究中，我们找到了通过使用耐磨材料和保护涂层来防止或克服此类复合侵蚀的有用方法。为了明确随着测试时间的发展过程并评估结果，通过扫描电子显微镜和高速相机，在空化方面，表面变形和侵蚀表面上的微尺度断裂。

The compound erosion, the coupling of abrasive wear and cavitation erosion, on affects the destruction of materials in many subtle ways. In this project, our studies are focused on the severe action of the erosion and the wear on accelerated cavitation, flow cavitation and impingement jet cavitation, which are significantly affected by various material properties and liquid qualities, and also are focused to clarify the mechanism of the compound erosion on metal surfaces, where unsteady vortex cavitation predominantly takes place in high-speed multiphase flows in turbomachinery. From these studies, we find the useful methods of preventing or overcoming such compound erosion, by using resistant materials and protective coatings. In order to make clear the development processes with test time and to evaluate the results, the surface deformation and the micro-scaled fracture on the eroded surface with respect to the cavitation aspects, through a scanning electron microscope as well as a highーspeed camera.