垂直淹没射流对泥沙冲刷效果影响的试验研究  

Experimental study on influence of vertical submerged jet on sediment scour effect

作　　者：张贡赫 陈加琦 史鸿博 王希坤 方玉建 ZHANG Gong-he;CHEN Jia-qi;SHI Hong-bo;WANG Xi-kun;FANG Yu-jian(Research Center of Fluid Machinery Engineering and Technology,Zhenjiang 212013,China;Quality Inspection Center for Pump Products in Zhejiang Province,Wenling 317599,China)

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]浙江省水泵产品质量检验中心,浙江温岭317599

出　　处：《水运工程》2022年第12期17-24,共8页Port & Waterway Engineering

基　　金：国家自然科学基金项目(52079057,52106043)。

摘　　要：为了研究垂直淹没射流中各因素对泥沙冲刷效果的影响规律,利用自行设计搭建的射流冲刷试验系统,基于“半模型”理论进行试验,通过摄像机和图像处理软件得到随冲刷参数E_(C)变化的冲坑形态,以及射流速度、靶距、喷嘴直径对冲坑尺寸的影响规律。结果表明,冲坑深度随冲刷时间的增加先迅速增大、后缓慢增大直至稳定状态,在此过程中,冲坑形状保持几何相似性;冲坑尺寸随射流速度的增加而增加,动态冲坑深度明显大于静态冲坑深度。此外,通过试验得出了使冲坑深度达到最大值的最佳射流靶距。研究结果可为射流清淤的实际工程应用提供参考。To study the effects of various factors of a submerged vertical jet on sediment scour process,a jet scouring test system has been designed and built based on the“semi-model”theory.Through image capturing and processing technique,variations of the scour hole shape with the scour parameter E_(C) are obtained,which takes into the account the influence of jet velocity,target distance and nozzle diameter.The results show that initially the scour hole depth increases rapidly and then increases slowly towards reaching equilibrium state,during this process,the shape of the scour hole maintains geometric similarity.The size of the scour hole increases with the increase of jet exit velocity,whereas the dynamic scour hole depth is significantly greater than the static scour hole depth.In addition,the optimum jet target distance is obtained through the tests,at which the depth of the scour hole reaches the maximum.The results can provide useful reference for the practical engineering application of jet dredging.

关 键 词：淹没射流 泥沙冲刷 冲击射流 射流靶距 冲坑 

分 类 号：U616[交通运输工程—船舶及航道工程]