On erosion transition from the incubation stage to the accumulation stage in liquid impingement erosion
On erosion transition from the incubation stage to the accumulation stage in liquid impingement erosion
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液体冲击侵蚀从孕育阶段到积累阶段的侵蚀转变
DOI：
10.1016/j.wear.2023.204952
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发表时间：
2023
期刊：
影响因子：
5
通讯作者：
Kei Fujisawa
中科院分区：
文献类型：
--
作者：
Kei Fujisawa
使用喷水装置研究了由液体射流的连续冲击引起的侵蚀过程中表面轮廓的演变。在本研究中，我们重点研究了液体冲击侵蚀过程中从孕育阶段到积累阶段的侵蚀转变，这对于核电站的水射流清洗和老化管理具有重要意义。通过计算局部侵蚀速率分布和表面粗糙度参数，研究了孤立凹坑和凹凸不平的形成。使用动态模式分解技术提取液体冲击引起的侵蚀结构。表面轮廓的变化主要是由孵化阶段形成孤立的凹坑和凹凸不平引起的。在孵化阶段，粗糙度参数保持不变，几乎无法测量侵蚀深度，而表面轮廓的偏度在此阶段开始增加。最初的小规模粗糙的侵蚀逐渐演变成大规模的火山口。动态模式分解分析表明，在孕育阶段存在短波长（模式A）表面凹陷，随后在堆积阶段由于模式A表面凹陷合并而形成长波长（模式B）侵蚀坑。
The evolution of surface profiles during erosion caused by the continuous impact of a liquid jet was studied using a water-jet apparatus. In this study, we focused on the erosion transition from the incubation stage to the accumulation stage during liquid impingement erosion, which is important for water-jet cleaning and aging management for nuclear power plants. By computing the local erosion rate distribution and surface roughness parameters, the formations of isolated pits and asperities were investigated. The structure of erosion caused by liquid impingement was extracted by using a dynamic mode decomposition technique. The surface profile changes were primarily caused by the formation of isolated pits and asperities during the incubation stage. The roughness parameters remained unchanged during the incubation stage, with barely measurable erosion depth, whereas the skewness of the surface profile began to increase during this stage. The initial erosion with a small-scale roughness gradually evolved into a large-scale crater. Dynamic mode decomposition analysis showed the presence of a short-wavelength (mode A) surface depression during the incubation stage, followed by a long-wavelength (mode B) erosion crater caused by the merging of mode A surface depressions during the accumulation stage.
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