發(fā)布時(shí)間：2019-02-24 19:36

【摘要】：瓦斯爆炸事故是造成群死群傷的首要災(zāi)害,對(duì)礦山安全生產(chǎn)構(gòu)成巨大威脅。在前人研究基礎(chǔ)上,基于計(jì)算流體動(dòng)力學(xué)軟件Fluent研究瓦斯爆炸數(shù)值計(jì)算方法以及管道屬性對(duì)瓦斯爆炸沖擊波傳播的影響,為煤礦防治瓦斯爆炸及其降低危害擴(kuò)大提供理論基礎(chǔ)。本文在前人研究成果的基礎(chǔ)上建立了描述管道內(nèi)瓦斯爆炸的物理模型和數(shù)學(xué)模型,采用有限速率/渦耗散模型處理瓦斯/空氣預(yù)混氣體的爆炸過程,采用SIMPLEC算法處理壓力-速度耦合關(guān)系,選取大渦模型作為湍流模型,提高了數(shù)值模擬精度。在驗(yàn)證模擬結(jié)果有效的條件下,分別對(duì)密閉管道的不同斷面尺寸和不同斷面形狀對(duì)瓦斯/空氣預(yù)混氣體爆炸過程進(jìn)行了數(shù)值模擬,研究表明：瓦斯爆炸整個(gè)過程的沖擊波壓力不斷增大,壓力上升速率也不斷增加；管徑增大,空間中瓦斯爆炸沖擊波發(fā)展相對(duì)于管徑較小的管道中爆炸發(fā)展過程要慢,管徑瓦斯爆炸湍流強(qiáng)度要小,矩形管道內(nèi)的沖擊波最大壓力總是低于圓形管道,增加速率也略低于圓形管道。
[Abstract]:Gas explosion is the most important disaster that causes mass death and injury, which poses a great threat to the safety of mine production. On the basis of previous studies, the numerical calculation method of gas explosion and the influence of pipeline properties on the propagation of gas explosion shock wave are studied based on the computational fluid dynamics software Fluent, which provides a theoretical basis for preventing and reducing gas explosion and its harm expansion in coal mines. Based on the previous research results, the physical and mathematical models of gas explosion in pipeline are established in this paper. The finite rate / vortex dissipation model is adopted to deal with the explosion process of gas / air premixed gas. The SIMPLEC algorithm is used to deal with the coupling relation between pressure and velocity, and the large eddy model is chosen as the turbulence model, which improves the accuracy of numerical simulation. Under the condition that the simulation results are valid, the gas / air premixed gas explosion process is numerically simulated for different section sizes and different section shapes of the airtight pipeline. The results show that the shock wave pressure increases and the pressure rise rate increases continuously during the whole process of gas explosion. With the increase of pipe diameter, the development of gas explosion shock wave in space is slower than that in the pipe with smaller diameter, and the turbulent intensity of gas explosion in pipe diameter is small. The maximum pressure of shock wave in rectangular pipeline is always lower than that in circular pipe. The increase rate is also slightly lower than the circular pipe.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TD712.7

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