【摘要】：在我國礦山開采行業(yè)中，井巷掘進(jìn)是礦井生產(chǎn)中最重要的作業(yè)場所之一，其作業(yè)場所環(huán)境狀況的好壞直接影響礦山井下勞動者的健康安全，因此研究掘進(jìn)工作面壓入式通風(fēng)風(fēng)流流場的分布規(guī)律和影響風(fēng)流流場分布因素是實(shí)現(xiàn)礦井掘進(jìn)工作面粉塵有效控制以及保證礦井安全生產(chǎn)的重要前提，而且對保護(hù)礦山井下勞動者的生命和財(cái)產(chǎn)安全具有重要意義。 本文根據(jù)掘進(jìn)巷道風(fēng)流流動和流場分布的實(shí)際情況，基于射流理論、空氣動力學(xué)、流體力學(xué)和計(jì)算流體動力學(xué)等理論，通過Fluent軟件建立了掘進(jìn)巷道采用壓入式通風(fēng)時風(fēng)流流場的物理模型和數(shù)學(xué)模型，并分析了計(jì)算邊界條件。同時采用RNG k-ε模型和壁面函數(shù)法對掘進(jìn)巷道風(fēng)流流動過程進(jìn)行描述，并進(jìn)行了掘進(jìn)巷道壓入式通風(fēng)過程的數(shù)值模擬研究，得出了掘進(jìn)巷道壓入式局部通風(fēng)時的風(fēng)流流場分布規(guī)律及風(fēng)流流速變化規(guī)律。在數(shù)值模擬可信的基礎(chǔ)上，研究了掘進(jìn)巷道不同受限貼附射流特征參數(shù)（風(fēng)筒出口布置位置、直徑、出風(fēng)風(fēng)速、距工作面的距離等）條件下風(fēng)流流場及風(fēng)筒出口中心軸線速度變化規(guī)律。 數(shù)值模擬計(jì)算結(jié)果表明：掘進(jìn)巷道采用壓入式局部通風(fēng)時風(fēng)流流場分為附壁射流區(qū)、沖擊射流區(qū)、回流區(qū)和渦流區(qū)等四個主要區(qū)域；風(fēng)筒出口位于掘進(jìn)巷道頂角時有利于風(fēng)流有效射程的擴(kuò)大；風(fēng)筒出口的大�。词芟蕹潭龋⿲α鲌鲇休^大影響；風(fēng)筒出口風(fēng)速不同時，風(fēng)筒出口中心軸線速度變化規(guī)律基本相同，只是數(shù)值上存在差別；掘進(jìn)工作面采用局部通風(fēng)時應(yīng)控制好風(fēng)筒出口距掘進(jìn)工作面的距離（但不應(yīng)大于風(fēng)流的有效射程）；掘進(jìn)巷道寬高比越大，對風(fēng)流的貼附效應(yīng)就明顯。數(shù)值計(jì)算模擬結(jié)果、現(xiàn)場測試結(jié)果和理論計(jì)算結(jié)果三者基本吻合，說明本文所建立的物理模型和數(shù)學(xué)模型與所選用的數(shù)值方法相適應(yīng)，為掘進(jìn)巷道風(fēng)流運(yùn)動過程以及粉塵分布規(guī)律等研究奠定了理論基礎(chǔ)。 本研究可為掘進(jìn)巷道中怎樣有效合理的防止煙塵提供可靠的理論依據(jù)，為礦井局部通風(fēng)提供理論指導(dǎo)和技術(shù)支持，，對保證礦山安全生產(chǎn)有重要的現(xiàn)實(shí)意義。
[Abstract]:In the mining industry of our country, roadway driving is one of the most important working places in the mine production. The environmental condition of the working place directly affects the health and safety of the underground workers. Therefore, it is an important prerequisite for effective dust control and safety production to study the distribution law of air flow field and the factors affecting the distribution of air flow field in tunneling face. Moreover, it is of great significance to protect the life and property safety of underground workers. Based on the theory of jet, aerodynamics, hydrodynamics, computational fluid dynamics and so on, according to the actual situation of wind flow and flow field distribution in tunneling roadway, this paper is based on the theory of jet, aerodynamics, hydrodynamics and computational fluid dynamics, etc. The physical model and mathematical model of wind flow field in tunneling roadway with pressure-in ventilation are established by Fluent software, and the boundary conditions are analyzed. At the same time, the RNG k- 蔚 model and the wall function method are used to describe the wind flow process of the tunneling roadway, and the numerical simulation of the tunneling roadway pressure-in ventilation process is carried out. The distribution law of air flow field and the variation law of air flow velocity are obtained. On the basis of credible numerical simulation, the characteristic parameters of different confined attached jets (location of tuyere outlet, diameter, wind speed out of wind) of tunneling roadway are studied. Under the condition of distance from the working face, the velocity of the air flow field and the central axis of the tuyere outlet is changed. The numerical simulation results show that the wind flow field is divided into four main areas: the wall jet zone, the impinging jet zone, the backflow zone and the eddy current zone. When the outlet of the tuyere is located at the top angle of the tunneling roadway, it is favorable to the expansion of the effective range of the wind flow; the size of the outlet of the tuyere (i.e. the limited degree) has a great influence on the flow field; the wind speed at the outlet of the tuyere is different at the same time, The velocity variation law of the axial line at the outlet of the tuyere is basically the same, but there is difference in numerical value, the distance from the outlet of the tuyere to the heading face should be controlled (but not larger than the effective range of the air flow) when the tunneling face adopts local ventilation. The larger the ratio of width to height of tunneling, the obvious adhesion effect to wind flow. The numerical simulation results, the field test results and the theoretical results are in good agreement with each other, which shows that the physical and mathematical models established in this paper are suitable for the selected numerical methods. It lays a theoretical foundation for the study of wind flow and dust distribution in tunneling roadway. This study can provide reliable theoretical basis for how to effectively and reasonably prevent smoke and dust in tunneling roadway, provide theoretical guidance and technical support for mine local ventilation, and have important practical significance to ensure mine safety in production.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TD72

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