ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

With the simulation of the flow in hydraulic machinery, experiments of cavitation, silt abrasion and their synergism on hydrofoil in the converging-diverging testing section were performed, and microscopic appearance along the damage surface was observed and depth distribution of damage was measured. The cavitation appearance shows like normal approximate round, and distributes randomly. According to the difference of action parameter on surface, silt abrasion appearance registers as wedging，relieving,，ploughing, and cutting, etc. On the high particle content, the appearance of synergism mostly appears as particle wear in extreme angles (90° or 0°), and scale character on hydrofoil surface becomes more and more large than silt abrasion appearance along the position, and the depth of macro-damage is obviously bigger than single wear. On the low particle content, the microstructure probably appears as the coexistence of cavitation and silt abrasion.