海底电缆覆盖物清理的移动射流过程仿真分析  

A numerical simulation method for soil cover cleaning of sea cables by movable jets

作　　者：蔡晔[1] 黄小卫[1] 李晓骏 王思宇 于嵩松 申卓远 武硕 CAI Ye;HUANG Xiaowei;LI Xiaojun;WANG Siyu;YU Songsong;SHEN Zhuoyuan;WU Shuo(Haikou SUB-Bureau,Guangzhou Bureau,EHV Transmission Company of China Southern Power Grid Co.,Ltd.,Haikou 570105,China;Central Southern China Electric Power Design Institute Co.,Ltd.,Wuhan 430071,China;School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司广州局海口分局,海南海口570105 [2]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [3]大连理工大学海洋科学与技术学院,辽宁盘锦124221

出　　处：《应用科技》2024年第4期17-24,共8页Applied Science and Technology

基　　金：中国南方电网有限责任公司科技项目(CGYKJXM20210306).

摘　　要：在实际工况中,高压喷嘴存在横向移动的速度,使得射流对土体的冲埋深度难以预测,导致海缆表面覆盖物清理不完全。针对此问题,建立了优化后的流场与冲埋深度预测理论模型,利用数值仿真对模型进行了验证。首先,建立了一种喷嘴流场优化模型,阐述了冲埋深度的预测方法;其次,建立了水射流破土数值仿真模型,选取射流压强、喷嘴直径、喷嘴横移速度以及土壤剪切强度4种控制参数,分析了不同参数对冲埋深度的影响。结果表明,随着射流压强、喷嘴直径的增大,冲坑深度逐渐增大;随着喷嘴横移速度和土体剪切强度的增加,冲坑深度逐渐减小。最后,理论结果和仿真结果进行对比,两者误差在允许范围之内。该模型可在一定程度上解决冲埋深度难以预测的问题,可为工程应用提供指导。In working conditions,a high-pressure nozzle has lateral movement speed,making it difficult to predict the depth of the scour hole,resulting in incomplete cleaning of the surface cover of the marine cable.To solve this problem,an optimized theoretical model for predicting the flow field and the scour hole depth was established and validated by numerical simulation method.Firstly,an optimization model for the flow field of the nozzel was established and a prediction method for the scour hole depth was elaborated;Secondly,a numerical simulation model for the jet breaking soil was established,and four control parameters,namely jet pressure,nozzle diameter,nozzle lateral velocity,and soil shear strength,were selected to analyze the influence of different parameters on the scour hole depth.It shows that as the jet pressure and nozzle diameter increase,the depth of the scour hole increases gradually;As the lateral velocity of the nozzel and the shear strength of the earth increase,the depth of the scour hole decreases step by step.Finally,the theoretical results were compared with the numerical results,and the error was within the allowable range.This model can solve the problem of difficult prediction of scour hole depth and provide guidance for engineering applications.

关 键 词：横向移动速度 理论模型 数值仿真 冲埋深度 流场优化模型 射流压强 土体剪切强度 喷嘴直径 

分 类 号：P756.1[天文地球—海洋科学]