| 缩放型喷嘴空化射流空泡云演化规律的试验研究 |
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| 引用本文： | 李伟,张文全,施卫东,杨勇飞,曹卫东.缩放型喷嘴空化射流空泡云演化规律的试验研究[J].排灌机械工程学报,2020,38(6):547-552. |
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| 作者姓名： | 李伟 张文全 施卫东 杨勇飞 曹卫东 |
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| 作者单位： | 江苏大学国家水泵及系统工程技术研究中心,江苏 镇江212013;南通大学机械工程学院,江苏 南通226019 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;国家自然科学基金;国家重点研发计划;江苏省重点研发计划;江苏省自然科学基金;江苏省自然科学基金;江苏高校优势学科建设工程项目;常州市科技支撑计划;镇江市重点研发计划项目 |
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| 摘 要： | 基于高速摄影技术对缩放型喷嘴进行空化射流试验,以揭示不同进口压力下空化射流流场特性,分析进口压力对空泡云演化规律的影响.结果表明:淹没式空化射流形成的泡云呈周期性变化,即在1个周期内包含空化初生、发展、脱落、溃灭4个不同阶段,并在空泡云脱落时达到最大的空泡面积、密度和宽度.由于随着射流入口压力的增大,喷嘴形成的射流速度加快,在射流边界层内速度梯度增大、射流核心区与伴随流的剪切作用增强,高速射流所产生的空泡云长度、面积和密度均呈增大趋势.同时,随着进口压力的增大,边界层内湍动能增大,加剧了部分流体的不规则运动,导致空泡云边界更加模糊且呈交错分布,空泡云的脱落频率不断增大.研究结果对提高空化射流在金属材料强化和石油钻井、破岩等领域的应用具有重要的理论意义和指导价值.
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| 关 键 词： | 喷嘴 空化射流 空泡云 高速摄影 |
| 收稿时间： | 2019-01-07 |
Experimental study on cavitation cloud evolution law of cavitation jet of convergent-divergent nozzle |
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| LI Wei,ZHANG Wenquan,SHI Weidong,YANG Yongfei,CAO Weidong.Experimental study on cavitation cloud evolution law of cavitation jet of convergent-divergent nozzle[J].Journal of Drainage and Irrigation Machinery Engineering,2020,38(6):547-552. |
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| Authors: | LI Wei ZHANG Wenquan SHI Weidong YANG Yongfei CAO Weidong |
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| Institution: | 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. College of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China |
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| Abstract: | To reveal the characteristics of cavitation jet flow field under different pump pressures and analyze the effect of inlet pressure on the evolvement law of cavitation could, an experiment on high-pressure cavitation jet of convergent-divergent nozzle was carried out by means of high-speed photography. The results show that the cavitation cloud of the submerged cavitation jet evolves periodically, which contains four stages in one cycle, namely initiation, development, shedding and collapse. The area, concentration and width of the cavity reach the highest values at the moment of shedding. With the increase of the pressure, the velocity of the jet center increases and velocity gradient in jet boundary la-yer increases, which intensifies the shearing action between the high-velocity flow and the steady li-quid, and thus leads to the increase of the cavitation dimension. Meanwhile, With the increase of the pressure, the shearing process leads to increasing turbulent kinetic energy, the contour profile of the cavitation cloud becomes vague, which increases the shedding frequency of the cavity. The results provide theoretical significance and guidance value for application of cavitation jet in the field of metal surface treatment, petroleum drilling and rock breaking. |
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| Keywords: | nozzle cavitation jet cavitation cloud high-speed photography |
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