中国机械工程 ›› 2025, Vol. 36 ›› Issue (10): 2215-2223.DOI: 10.3969/j.issn.1004-132X.2025.10.007

• 国家重点科技项目研究进展专栏 • 上一篇    

壁面微缺陷影响下的介观尺度冲击射流流场特性

洪睿1,4(), 胡建军1,2(), 肖洋1, 金瑶兰3, 姚静2, 孔祥东2   

  1. 1.燕山大学建筑工程与力学学院, 秦皇岛, 066004
    2.燕山大学机械工程学院, 秦皇岛, 066004
    3.中国船舶集团有限公司第七〇四研究所, 上海, 201612
    4.中国汽车工程研究院股份有限公司, 重庆, 401122
  • 收稿日期:2024-05-20 出版日期:2025-10-25 发布日期:2025-11-05
  • 通讯作者: 胡建军
  • 作者简介:洪睿,女,1997年生,硕士研究生。研究方向为流体力学。E-mail: ah.hongrui@qq.com
    胡建军*(通信作者),男,1982年生,教授、博士研究生导师。研究方向为流体力学。E-mail: kewei729@163.com
  • 基金资助:
    国家自然科学基金(51890881);中央引导地方科技发展资金(226Z1902G)

Flow Field Characteristics of Mesoscopic Impinging Jets under Influences of Wall Micro-defects

Rui HONG1,4(), Jianjun HU1,2(), Yang XIAO1, Yaolan JIN3, Jing YAO2, Xiangdong KONG2   

  1. 1.School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao,Hebei,066004
    2.School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei,066004
    3.The No. 704 Research Institute of China State Shipbuilding Corporation Limited,Shanghai,201612
    4.China Automotive Engineering Research Institute Co. ,Ltd. ,Chongqing,401122
  • Received:2024-05-20 Online:2025-10-25 Published:2025-11-05
  • Contact: Jianjun HU

摘要:

为研究射流管阀喷嘴-接受器前置级长期服役后,冲蚀磨损及气穴气蚀现象造成的微缺陷对流场流动规律和流体能量转换特性的影响,利用显微粒子图像测速技术对原始介观尺度近距离射流冲击微缺陷靶板时方腔内的流动结构和涡旋分布进行直接试验观测,探究了微缺陷大小、形状与位置对涡旋形态及其演化规律的影响,揭示了方腔内涡核分裂与归一现象背后蕴含的机理。研究结果表明:壁面微缺陷的存在直接影响壁面射流能量的传递与耗散,导致射流间隙和方腔内的涡旋结构和能量分布与无缺陷时显著不同;随着微凹坑尺寸的增大,两侧方腔内类圆形涡旋对呈现出逐渐分裂并远离底部壁面的趋势;而随着微凸起尺寸的增大,两侧方腔内类茧形涡旋对呈现出逐渐归一并靠近底部表面的演化规律。

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)

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 target 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 directly 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 increases, the cocoon-like vortex pairs in the square cavity on both sides show an evolutionary law of gradually normalization and moving closer to that of the bottom wall.

Key words: jet pipe servo valves, meso scale, impingement jet, micro-defect, micro-particle image velocimetry(Micro-PIV)

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