平面射流冲刷初期的流场特性与输沙率研究  

Study on flow field characteristics and sediment transport rate in initial stage of plane-jet induced scour

作　　者：罗爱泽 程年生 卢叶盛 魏茂兴 LUO Ai-ze;CHENG Nian-sheng;LU Ye-sheng;WEI Mao-xing(Ocean College,Zhejiang University,Zhoushan 316021,China;The Engineering Research Center of Oceanic Sensing Technology and Equipment,Ministry of Education,Zhoushan 316021,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316021 [2]海洋感知技术与装备教育部工程研究中心,浙江舟山316021

出　　处：《泥沙研究》2023年第4期17-23,31,共8页Journal of Sediment Research

基　　金：国家自然科学基金项目(51979242)。

摘　　要：平面射流冲刷是局部冲刷的典型案例,由于冲刷初期水沙相互作用剧烈、床面形态变化迅速等原因,相关研究在文献中鲜有报道。利用图像处理技术详细观测了平面射流冲刷坑的形态演变和流场变化特性。分析结果表明:冲刷坑的发展过程因输沙特性的不同可划分为两个阶段,即初始阶段的“剪切冲刷”和充分发展阶段的“涡体冲刷”。针对剪切冲刷,应用推移质输沙模型,分析了其输沙规律。研究结果得到了试验数据的验证。Local scour induced by plane jet occurs in engineering applications,of which the evolution process is one of attractive topics in the field of sediment transport.The scour is characterized by intense flow-sediment interactions and rapid variations in the bed morphology.This study applied an image-based technique to capture the detail of scour processes and related variations in the flow field.The results show that the processes of scour hole can be divided into two typical stages,as"shear scour"in the initial stage and"vortex scour"in the subsequent developing stage,which are associated with different mechanisms of sediment transport.The bedload model for sheet flows is then applied to analyze the sediment transport related to the"shear scour",of which the results are validated by the experimental data.

关 键 词：剪切冲刷 涡体冲刷 平面射流 局部冲刷 输沙率 

分 类 号：TV851[水利工程—水利水电工程]