中国机械工程2025，Vol.36Issue(10)：2215-2223,2231,10.DOI:10.3969/j.issn.1004-132X.2025.10.007
壁面微缺陷影响下的介观尺度冲击射流流场特性
Flow Field Characteristics of Mesoscopic Impinging Jets under Influences of Wall Micro-defects
摘要
Abstract
In order to study the effects of micro-defects caused by erosion wear and cavitation on flow field law and fluid energy conversion characteristics after long-term service of the nozzle-receiver pilot stage of the jet pipe servo valves.Micro-PIV technology was used to directly test the flow structure and vortex distribution in the square cavity when the original mesoscopic close-range jet impacted the micro-defect tar-get plate.The influences of micro-defect size,shape,and location on vortex morphology and the evolution were investigated,and the underlying mechanism governing the splitting and merging phenomena of vortex cores within a square cavity were elucidated.The results show that the existence of wall micro-defects di-rectly affects the energy transfer and dissipation of the wall jets,leading to a significantly different vortex structure and energy distribution in the jet gap and square cavity than that when there are no defects.As the size of the micro-concave increases,the circular-like vortex pairs in the square cavity on both sides show a tendency to gradually split and move away from the bottom wall.While as the size of micro-convex in-creases,the cocoon-like vortex pairs in the square cavity on both sides show an evolutionary law of gradu-ally normalization and moving closer to that of the bottom wall.关键词
射流管伺服阀/介观尺度/冲击射流/微缺陷/显微粒子图像测速(Micro-PIV)Key words
jet pipe servo valves/meso scale/impingement jet/micro-defect/micro-particle image velocimetry(Micro-PIV)引用本文复制引用
洪睿,胡建军,肖洋,金瑶兰,姚静,孔祥东..壁面微缺陷影响下的介观尺度冲击射流流场特性[J].中国机械工程,2025,36(10):2215-2223,2231,10.基金项目
国家自然科学基金(51890881) （51890881）
中央引导地方科技发展资金(226Z1902G) （226Z1902G）
