【摘要】：多重管法旋噴注漿技術(shù)的應(yīng)用越來(lái)越廣泛,而噴嘴作為旋噴注漿系統(tǒng)的核心設(shè)備之一,對(duì)射流的動(dòng)力學(xué)性能及內(nèi)、外流場(chǎng)的分布有著重要的影響意義。根據(jù)不同的用途設(shè)計(jì)不同結(jié)構(gòu)的噴嘴,好的噴嘴結(jié)構(gòu)能夠得到理想的射流。因此設(shè)計(jì)更佳的噴嘴結(jié)構(gòu)并完善噴嘴的結(jié)構(gòu)參數(shù)已經(jīng)成為國(guó)內(nèi)外研究的關(guān)鍵性問(wèn)題。本文根據(jù)課題研究?jī)?nèi)容主要涉及兩種不同噴射介質(zhì)的噴嘴,分別是多孔水射流噴嘴和旋流水泥粉噴嘴。針對(duì)多孔水射流噴嘴,主要建立三種不同結(jié)構(gòu)的核心流道,并建立各自的三維物理模型,通過(guò)CFD流體分析軟件進(jìn)行數(shù)值模擬,建立氣-液兩相流的模型,并采用多相流分析的Mixture分析方法對(duì)多孔水射流噴嘴的速度和壓力進(jìn)行耦合。通過(guò)對(duì)比分析模擬數(shù)據(jù),橢圓型流道結(jié)構(gòu)的噴嘴具有相較其他兩種結(jié)構(gòu)更好的水力特性,具有較大的核心速度,集束性較好。輔助射流在核心噴射孔與輔助噴射孔的軸線距離D=8mm時(shí)具有較好的水力特性,并且對(duì)核心射流的影響最小。針對(duì)旋流水泥粉噴嘴,采用氣-固兩相流模型和多相流分析的VOF分析方法,通過(guò)對(duì)比不同旋轉(zhuǎn)角的旋流對(duì)噴嘴外部流場(chǎng)的影響,得出隨著旋轉(zhuǎn)角度的增大,噴射半徑有所提高,水泥粉射流更易發(fā)散,有利于水泥粉與孔內(nèi)巖屑泥漿的混合,通過(guò)模擬分析得出旋轉(zhuǎn)角在60°左右,旋流水泥粉噴嘴的效果較好。最后本文根據(jù)實(shí)驗(yàn)室現(xiàn)有的條件,對(duì)三種流道結(jié)構(gòu)的水射流噴嘴進(jìn)行實(shí)驗(yàn)室試驗(yàn),分別演示在空氣中水射流的外部流場(chǎng)分布情況,根據(jù)噴嘴的實(shí)際工作情況驗(yàn)證噴嘴設(shè)計(jì)的合理性,有利于對(duì)射流進(jìn)行輔助研究。
[Abstract]:As one of the core equipment of the rotary jet grouting system, the nozzle has an important influence on the dynamic performance of the jet and the distribution of the internal and external flow field. According to the different uses, the good nozzle structure can get the ideal jet. Therefore, the design of better nozzle structure and the improvement of nozzle structure parameters have become a key issue in domestic and foreign research. In this paper, two kinds of nozzles with different injection media are mainly involved, namely, porous water jet nozzles and swirling cement powder nozzles. For porous water jet nozzles, three kinds of core flow channels with different structures are established, and their respective three-dimensional physical models are established. The gas-liquid two-phase flow model is established by numerical simulation with CFD fluid analysis software. The velocity and pressure of porous water jet nozzle are coupled by the Mixture analysis method of multiphase flow analysis. By comparing and analyzing the simulation data, the nozzle with elliptical channel structure has better hydraulic characteristics than the other two structures, and has larger core velocity and better clustering property. The auxiliary jet has good hydraulic characteristics when the axis between the core jet hole and the auxiliary jet hole is D=8mm, and has the least influence on the core jet. Aiming at the swirl cement powder nozzle, the gas-solid two-phase flow model and the VOF analysis method of multiphase flow analysis are adopted. By comparing the influence of swirling flow at different rotation angles on the external flow field of the nozzle, it is concluded that the jet radius increases with the increase of rotation angle. The cement powder jet is more easily dispersed, which is beneficial to the mixing of cement powder and cuttings slurry in the hole. The simulation analysis shows that the rotation angle is about 60 擄and the swirling cement powder nozzle has better effect. Finally, according to the existing conditions in the laboratory, three kinds of water jet nozzles with different channel structures are tested in the laboratory to demonstrate the distribution of the external flow field of the water jet in the air. The rationality of the nozzle design is verified according to the actual working conditions of the nozzle, which is beneficial to the study of the jet.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU643

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1 楊冬冬;多重管法旋噴注漿用射流噴嘴的結(jié)構(gòu)設(shè)計(jì)與試驗(yàn)研究[D];吉林大學(xué);2017年

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本文編號(hào)：2217291