| 波流环境下双孔浮射流运动特性 |
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| 引用本文： | 丁宏伟,杨全义,徐振山,张玉玲,陈永平,杨柳俊.波流环境下双孔浮射流运动特性[J].河海大学学报(自然科学版),2019,47(2):183-188. |
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| 作者姓名： | 丁宏伟 杨全义 徐振山 张玉玲 陈永平 杨柳俊 |
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| 作者单位： | 河海大学港口海岸与近海工程学院,江苏南京,210098;中国卫星海上测控部,江苏无锡,214400;江苏省水文水资源勘测局南通分局,江苏南通,226006 |
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| 基金项目： | 江苏省水利科技项目(2017048)；江苏省自然科学基金(BK20170882) |
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| 摘 要： | 利用粒子图像测速技术(PIV)对波流环境下双孔浮射流的速度场进行测量,对不同组次的相位平均速度场、时均速度场进行定性描述;通过引入考虑横流、波浪、浮力影响的综合特征长度l_(mb),给出了轴线垂向速度衰减过程分区的定量结果。研究表明,波流作用下会产生污染物云团现象,加快双孔射流速度衰减;波浪的作用能够减弱孔间相互影响;浮力的作用能够减小射流体偏转角度和侧向展宽;无量纲的轴线垂向速度变化可以分为近区(z/l_(mb)3)、过渡区(3z/l_(mb)6)、远区(z/l_(mb)6)3个区段。
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| 关 键 词： | 双孔浮射流 粒子图像测速技术 波流环境 速度场 特征长度 |
Characteristics of dual buoyant jets movement in wavy-crossflow environment |
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| DING Hongwei,YANG Quanyi,XU Zhenshan,ZHANG Yuling,CHEN Yongping and YANG Liujun.Characteristics of dual buoyant jets movement in wavy-crossflow environment[J].Journal of Hohai University (Natural Sciences ),2019,47(2):183-188. |
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| Authors: | DING Hongwei YANG Quanyi XU Zhenshan ZHANG Yuling CHEN Yongping and YANG Liujun |
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| Institution: | College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,China Satellite Maritime Tracking and Control Department, Wuxi 214400, China,College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China and Nantong Branch, Bureau of Hydrology and Water Resources Survey of Jiangsu Province, Nantong 226006, China |
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| Abstract: | Flow field of dual buoyant jets in wavy-crossflow environment was measured using the PIV technique. The phase-averaged and time-average velocity field in different conditions were qualitatively described, and the quantitative result of vertical velocity decay at the centerline was given by introducing a characteristic length(lmb), considering effects of crossflow, wave and buoyancy. The results showed that, the effluent clouds were produced due to the combined effects of wave and current and the interaction of two jets was attenuated under the effect of wave. The buoyancy effect could reduce the jet deflection angle and the lateral width. Based on the dimensional analysis, dimensionless vertical velocity at the centerline could be divided into three regions: the near-field region(z/lmb<3), the transition region(3<z/lmb<6), and the far-field region(z/lmb>6). |
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| Keywords: | dual buoyant jets PIV technique wavy-crossflow environment flow field characteristic length |
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