多重管法旋喷注浆用射流喷嘴的结构设计与试验研究
发布时间：2018-09-01 13:07
【摘要】：多重管法旋喷注浆技术的应用越来越广泛,而喷嘴作为旋喷注浆系统的核心设备之一,对射流的动力学性能及内、外流场的分布有着重要的影响意义。根据不同的用途设计不同结构的喷嘴,好的喷嘴结构能够得到理想的射流。因此设计更佳的喷嘴结构并完善喷嘴的结构参数已经成为国内外研究的关键性问题。本文根据课题研究内容主要涉及两种不同喷射介质的喷嘴,分别是多孔水射流喷嘴和旋流水泥粉喷嘴。针对多孔水射流喷嘴,主要建立三种不同结构的核心流道,并建立各自的三维物理模型,通过CFD流体分析软件进行数值模拟,建立气-液两相流的模型,并采用多相流分析的Mixture分析方法对多孔水射流喷嘴的速度和压力进行耦合。通过对比分析模拟数据,椭圆型流道结构的喷嘴具有相较其他两种结构更好的水力特性,具有较大的核心速度,集束性较好。辅助射流在核心喷射孔与辅助喷射孔的轴线距离D=8mm时具有较好的水力特性,并且对核心射流的影响最小。针对旋流水泥粉喷嘴,采用气-固两相流模型和多相流分析的VOF分析方法,通过对比不同旋转角的旋流对喷嘴外部流场的影响,得出随着旋转角度的增大,喷射半径有所提高,水泥粉射流更易发散,有利于水泥粉与孔内岩屑泥浆的混合,通过模拟分析得出旋转角在60°左右,旋流水泥粉喷嘴的效果较好。最后本文根据实验室现有的条件,对三种流道结构的水射流喷嘴进行实验室试验,分别演示在空气中水射流的外部流场分布情况,根据喷嘴的实际工作情况验证喷嘴设计的合理性,有利于对射流进行辅助研究。
[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 掳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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU643
本文编号：2217291
[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 掳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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU643
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1 杨冬冬;多重管法旋喷注浆用射流喷嘴的结构设计与试验研究[D];吉林大学;2017年
，本文编号：2217291
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