本文關(guān)鍵詞：淹沒式自激振脈沖磨料水射流脈沖特性及切割試驗研究　出處：《大連海事大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

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【摘要】：本文將自激振脈沖磨料水射流技術(shù)應(yīng)用于深海環(huán)境下的沉船切割開孔,為提升我國海洋救助打撈裝備水平具有重要意義。自激振脈沖磨料水射流技術(shù)是在自激振脈沖射流和磨料水射流的基礎(chǔ)上發(fā)展而來的,它同時具有脈沖射流的脈沖特性和磨料水射流的破壞性。本文通過管系水錘現(xiàn)象分析了自激振脈沖射流產(chǎn)生脈動的根本原因是由于外界激勵產(chǎn)生周期性的的壓力擾動波；利用流體網(wǎng)絡(luò)理論推導(dǎo)出赫姆霍茲式振蕩腔腔體結(jié)構(gòu)參數(shù)與自激振脈動頻率之間的關(guān)系式；通過FLUENT軟件仿真模擬了深海圍壓對自激振脈沖射流的流場的影響；搭建了自激振脈沖射流動壓測量試驗臺,用于分析自激振脈沖噴嘴的結(jié)構(gòu)參數(shù)和產(chǎn)生射流的水力參數(shù)對射流動壓的影響；同時搭建了自激振脈沖磨料水射流切割試驗系統(tǒng),用于分析自激振脈沖磨料水射流的切割能力。通過理論研究、仿真分析和試驗,本文得到以下結(jié)論：(1)赫姆霍茲振蕩腔的固有頻率與腔體結(jié)構(gòu)參數(shù)有關(guān)。當射流在自激振腔體內(nèi)產(chǎn)生的擾動波頻率與腔體固有頻率一致時,會產(chǎn)生大尺度的渦環(huán)結(jié)構(gòu),從而產(chǎn)生自激振脈沖射流。(2)通過仿真發(fā)現(xiàn),自激振脈沖磨料水射流中各相的出口速度隨深水圍壓的增大而減小,而且水相的速度比磨料相的速度要大。(3)通過試驗發(fā)現(xiàn),組合式自激振脈沖噴嘴產(chǎn)生的射流動壓隨時間呈周期性變化,組合式自激振脈沖噴嘴最佳的上下噴嘴直徑比為1-1.33,自激振腔的長徑比為0.66。(4)通過切割試驗對比發(fā)現(xiàn),磨料粒子對靶體的磨削作用占主要地位,同時磨料粒子對噴嘴的磨損十分嚴重,噴嘴材料有待提高。
[Abstract]:In this paper, the self-excited pulse abrasive water jet technique is applied to the cutting hole of sunken ship in deep-sea environment. In order to improve the level of marine salvage equipment in China, the self-excited pulsed abrasive jet technology is developed on the basis of self-excited pulse jet and abrasive water jet. It also has the pulse characteristic of pulse jet and the destructiveness of abrasive water jet. In this paper, through the water hammer phenomenon of pipe system, the fundamental reason of pulsation of self-excited pulse jet is that the periodic pressure is produced by external excitation. Disturbance wave; Based on the theory of fluid network, the relationship between the structural parameters of the Hem Holtz resonator and the frequency of the self-excited oscillation is derived. The effect of deep sea confining pressure on the flow field of self-excited pulsed jet is simulated by FLUENT software. The self-excited pulse jet pressure measurement test rig is built to analyze the influence of the structure parameters of the self-excited pulse nozzle and the hydraulic parameters of the jet on the jet flow pressure. At the same time, a self-excited pulse abrasive water jet cutting test system is built to analyze the cutting ability of self-excited pulse abrasive water jet. Through theoretical research, simulation analysis and test. In this paper, the following conclusions are obtained: (1) the natural frequency of the Hem resonator is related to the structure parameters of the cavity, when the frequency of the disturbance wave produced by the jet in the self-excited cavity is the same as the natural frequency of the cavity. Large scale vortex ring structure will produce self-excited pulse jet. Through simulation, it is found that the exit velocity of each phase in the self-excited pulse abrasive water jet decreases with the increase of confining pressure in deep water. And the velocity of water phase is larger than that of abrasive phase. The optimum ratio of upper and lower nozzle diameter is 1-1.33 and the ratio of length to diameter of self-excited cavity is 0.66.4. Abrasive particles play a major role in grinding targets, and abrasive particles wear nozzles seriously, and nozzle materials need to be improved.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG664

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本文編號：1369258