射流助推式ROV型开沟机喷射臂及其冲刷过程研究

发布时间：2018-06-05 05:25

本文选题：射流助推型 + ROV型挖沟机　；参考：《浙江大学》2016年硕士论文

【摘要】：海底电缆输电工程是跨海域输电联网工程建设的关键部分,在实现电网国际化和区域电网互联进程中起着重要作用。为了对其进行的保护通常为挖沟埋设,对于浙江沿海海底地形复杂、流急多礁的恶劣条件,后挖沟技术最为适用,而ROV型挖沟机在后挖沟技术中最为常用。而现有ROV型挖沟机在推进器作为动力时相对于履带推进时冲刷功率下降,使冲刷效率下降。因此,研究不同因素对冲刷效果的影响,对优化射流助推型ROV型挖沟机喷射系统是十分必要的。本文通过理论分析、缩小模型试验和数值仿真,分析验证了喷射臂参数与冲刷效果的关系。本文第一章主要介绍了本课题的研究背景、挖沟机及其喷射系统的研究现状。根据作业需求和各类挖沟机的优缺点分析,提出了本课题的研究意义和研究的主要内容。本文第二章在分析射流助推型ROV型挖沟机现状和作业需求的基础上,提出了提高该类挖沟机效率的方法,并分析了冲刷参数对效率提升的影响。结合喷嘴冲刷过程中的射流破土基理和射流冲淤基理,分析上述冲刷参数及其它参数与破土应力和输沙率的关系。本文第三章采用了Flow-3D软件进行了喷射冲刷仿真来分析了单喷嘴冲刷过程以及组合喷嘴冲刷时相邻喷嘴间的影响。从冲刷过程的流速和压力分布、悬沙浓度等参数的的变化对冲刷过程进行了详细的分析,并分析了改变冲刷靶距和喷嘴间距时对相邻喷嘴冲刷效果的影响改变。本文第四章根据相似模型理论设计单喷嘴冲刷的缩小模型静态冲刷和移动冲刷试验。根据试验需求选定了试验底质并进行了分析,设计了试验平台的调节装置和驱动装置,以及试验用喷射系统等,并设计了观测装置。本文第五章对比了单喷嘴冲刷的仿真和试验结果,验证了仿真结果的可靠性,并分析了冲刷角、冲刷靶距、冲刷流量、以及冲刷流速对冲刷效果的影响,以及不同冲刷参数时冲刷轮廓的自相似性；移动冲刷试验主要分析了移动冲刷时,不同冲刷角的冲刷效果、不同移动速度的冲刷效果以及不同冲刷参数下的冲刷断面的自相似性。本文第六章对全文的主要研究工作进行了总结,并对其存在的不足提出了进一步研究和改进的方向。
[Abstract]:Submarine cable transmission project is a key part of cross-sea transmission network construction, which plays an important role in the process of realizing the internationalization of power grid and the interconnection of regional power grid. In order to protect it, it is usually buried in trenches, and it is the most suitable for the bad conditions of complicated topography and many reefs in the coastal area of Zhejiang Province, while the ROV type trench excavator is the most commonly used in the backdigging technique. However, the scour power of the existing ROV excavator is decreased when the propeller is used as the power compared with the crawler propulsion, which results in the decrease of the scour efficiency. Therefore, it is necessary to study the influence of different factors on the scour effect for the optimization of jet propelled ROV type trench excavator injection system. In this paper, the relationship between the parameters of the ejector arm and the scour effect is verified by theoretical analysis, reduced model test and numerical simulation. The first chapter mainly introduces the research background of this subject, the research status of trencher and its injection system. According to the requirement of operation and the advantages and disadvantages of all kinds of excavators, the research significance and main contents of this subject are put forward. In the second chapter, based on the analysis of the current situation and operational requirements of jet propelled ROV excavator, the method of improving the efficiency of this kind of excavator is put forward, and the influence of scour parameters on the efficiency improvement is analyzed. The relationship between the above parameters and the soil breaking stress and sediment transport rate is analyzed by combining the soil breaking theory of jet and the basic theory of jet scouring and silting during the process of nozzle scouring. In the third chapter, Flow-3D software is used to simulate the flushing process of single nozzle and the influence between adjacent nozzles when combined nozzles are flushed. The scouring process is analyzed in detail from the change of velocity and pressure distribution and suspended sediment concentration in the scouring process, and the influence of changing the target distance and the distance between nozzles on the scouring effect of adjacent nozzles is analyzed. In chapter 4, the static and moving scour tests of single nozzle scour are designed according to the similarity model theory. According to the test demand, the test bottom material is selected and analyzed, the adjusting device and driving device of the test platform and the test jet system are designed, and the observation device is designed. In the fifth chapter, the simulation and test results of single nozzle scour are compared, and the reliability of the simulation results is verified. The effects of scour angle, target distance, scour flow rate and scour velocity on the scour effect are analyzed. And the self-similarity of the scour profile with different scour parameters. The scouring effects of different moving velocities and the self-similarity of scour sections under different scouring parameters. In the sixth chapter, the main research work of this paper is summarized, and the direction of further research and improvement is put forward.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P756.1

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