本文選題：射流助推型 + ROV型挖溝機(jī)��； 參考：《浙江大學(xué)》2016年碩士論文

【摘要】：海底電纜輸電工程是跨海域輸電聯(lián)網(wǎng)工程建設(shè)的關(guān)鍵部分,在實(shí)現(xiàn)電網(wǎng)國際化和區(qū)域電網(wǎng)互聯(lián)進(jìn)程中起著重要作用。為了對(duì)其進(jìn)行的保護(hù)通常為挖溝埋設(shè),對(duì)于浙江沿海海底地形復(fù)雜、流急多礁的惡劣條件,后挖溝技術(shù)最為適用,而ROV型挖溝機(jī)在后挖溝技術(shù)中最為常用。而現(xiàn)有ROV型挖溝機(jī)在推進(jìn)器作為動(dòng)力時(shí)相對(duì)于履帶推進(jìn)時(shí)沖刷功率下降,使沖刷效率下降。因此,研究不同因素對(duì)沖刷效果的影響,對(duì)優(yōu)化射流助推型ROV型挖溝機(jī)噴射系統(tǒng)是十分必要的。本文通過理論分析、縮小模型試驗(yàn)和數(shù)值仿真,分析驗(yàn)證了噴射臂參數(shù)與沖刷效果的關(guān)系。本文第一章主要介紹了本課題的研究背景、挖溝機(jī)及其噴射系統(tǒng)的研究現(xiàn)狀。根據(jù)作業(yè)需求和各類挖溝機(jī)的優(yōu)缺點(diǎn)分析,提出了本課題的研究意義和研究的主要內(nèi)容。本文第二章在分析射流助推型ROV型挖溝機(jī)現(xiàn)狀和作業(yè)需求的基礎(chǔ)上,提出了提高該類挖溝機(jī)效率的方法,并分析了沖刷參數(shù)對(duì)效率提升的影響。結(jié)合噴嘴沖刷過程中的射流破土基理和射流沖淤基理,分析上述沖刷參數(shù)及其它參數(shù)與破土應(yīng)力和輸沙率的關(guān)系。本文第三章采用了Flow-3D軟件進(jìn)行了噴射沖刷仿真來分析了單噴嘴沖刷過程以及組合噴嘴沖刷時(shí)相鄰噴嘴間的影響。從沖刷過程的流速和壓力分布、懸沙濃度等參數(shù)的的變化對(duì)沖刷過程進(jìn)行了詳細(xì)的分析,并分析了改變沖刷靶距和噴嘴間距時(shí)對(duì)相鄰噴嘴沖刷效果的影響改變。本文第四章根據(jù)相似模型理論設(shè)計(jì)單噴嘴沖刷的縮小模型靜態(tài)沖刷和移動(dòng)沖刷試驗(yàn)。根據(jù)試驗(yàn)需求選定了試驗(yàn)底質(zhì)并進(jìn)行了分析,設(shè)計(jì)了試驗(yàn)平臺(tái)的調(diào)節(jié)裝置和驅(qū)動(dòng)裝置,以及試驗(yàn)用噴射系統(tǒng)等,并設(shè)計(jì)了觀測(cè)裝置。本文第五章對(duì)比了單噴嘴沖刷的仿真和試驗(yàn)結(jié)果,驗(yàn)證了仿真結(jié)果的可靠性,并分析了沖刷角、沖刷靶距、沖刷流量、以及沖刷流速對(duì)沖刷效果的影響,以及不同沖刷參數(shù)時(shí)沖刷輪廓的自相似性；移動(dòng)沖刷試驗(yàn)主要分析了移動(dòng)沖刷時(shí),不同沖刷角的沖刷效果、不同移動(dòng)速度的沖刷效果以及不同沖刷參數(shù)下的沖刷斷面的自相似性。本文第六章對(duì)全文的主要研究工作進(jìn)行了總結(jié),并對(duì)其存在的不足提出了進(jìn)一步研究和改進(jìn)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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P756.1

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