本文選題：煤礦除塵裝置 + 超音速氣流�。� 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：粉塵是煤礦井下主要自然災(zāi)害之一,其不僅影響礦井下的工作環(huán)境,且在一定條件下會(huì)發(fā)生爆炸,嚴(yán)重威脅礦井生產(chǎn)安全和工作人員身心健康。隨著礦井機(jī)械化水平的不斷提高,井下粉塵量也越來越大,一套合理、有效的除塵裝置變得極為迫切。本文以超音速氣霧化噴頭為研究對象,利用工作面管網(wǎng)中的壓風(fēng)和壓水,通過噴頭形成氣霧捕捉粉塵,可以有效的降低煤礦井下粉塵顆粒濃度,凈化空氣質(zhì)量,杜絕了粉塵爆炸事故的發(fā)生。其主要研究內(nèi)容如下:1.以二維平面為計(jì)算域,不考慮氣流壓縮性和噴管結(jié)構(gòu)的影響,在不同超音速橫風(fēng)下對液柱一次霧化、液滴二次霧化和激波霧化機(jī)理進(jìn)行數(shù)值模擬分析。2.根據(jù)對霧化機(jī)理和擬一維噴管流動(dòng)解析解,設(shè)計(jì)拉瓦爾噴管結(jié)構(gòu)曲線以及三種不同液膜環(huán)縫的形狀、位置的內(nèi)噴管,建立超音速氣霧化噴頭三維模型。3.考慮氣流的壓縮性,對超音速氣霧化噴頭內(nèi)噴管氣流加速特性研究,通過數(shù)值計(jì)算軟件Fluent對超音速氣霧化噴頭二維模型氣-液兩相霧化和三維模型工.作環(huán)境下氣霧化流場的模擬驗(yàn)證。根據(jù)液柱一次霧化模擬結(jié)果,得到液柱橫風(fēng)下霧化粒度狀態(tài)和穿透深度動(dòng)態(tài)圖,并擬合得到橫風(fēng)速度與液柱直徑對穿透深度的經(jīng)驗(yàn)公式;根據(jù)液滴橫風(fēng)下的二次霧過程的可視化模擬結(jié)果,解釋了液滴從表層液的蠕動(dòng)、變形到完全破碎為二次液滴的物理原因;嘗試激波脈沖作用下對液滴的的霧化模擬;對所設(shè)計(jì)內(nèi)噴管模擬得到氣流加速特征曲線,并通過氣-液兩相緊耦合VOF+Level Set模型模擬,得到內(nèi)噴管壓力、速度、湍流強(qiáng)度等分布云圖;對超音速氣霧化噴頭三維模型除塵工況模擬,得到氣霧卷吸污風(fēng)的三維流場。
[Abstract]:Dust is one of the main natural disasters in the coal mine. It not only affects the working environment under the mine, but also explodes under certain conditions, which seriously threatens the safety of mine production and the physical and mental health of the workers. With the improvement of mine mechanization, the amount of dust is increasing, and a reasonable and effective dedusting device is becoming more and more urgent. In this paper, the supersonic gas atomization nozzle is taken as the research object, the dust can be effectively reduced and the air quality can be purified by using the pressurized air and water pressure in the working face pipe network to form the air mist to capture the dust in the coal mine. Put an end to the dust explosion accident. The main research contents are as follows: 1: 1. Taking the two-dimensional plane as the computational domain, the mechanism of the primary atomization of liquid column, the secondary atomization of droplet and the atomization mechanism of shock wave are numerically simulated under different supersonic transverse wind without considering the compressibility of airflow and the structure of nozzle. According to the atomization mechanism and the analytical solution of quasi-one-dimensional nozzle flow, the structure curve of Laval nozzle and the inner nozzle with three different liquid film annular seams are designed, and the three-dimensional model of supersonic atomization nozzle .3is established. Considering the compressibility of the airflow, the acceleration characteristics of the nozzle in the supersonic gas atomization nozzle are studied. The two-dimensional gas-liquid two-phase atomization and the three-dimensional modeler of the supersonic gas atomizer are simulated by the numerical calculation software Fluent. The simulation of the gas atomization flow field in the environment is carried out. According to the results of one-time atomization simulation of liquid column, the dynamic diagram of atomization particle size and penetration depth under crosswind is obtained, and the empirical formula of crosswind velocity and liquid column diameter to penetration depth is obtained. According to the visual simulation results of the secondary fog process under the cross wind of the droplet, the physical reason of the droplet's creep from the surface liquid to the complete break-up to the secondary droplet is explained, and the atomization simulation of the droplet under the action of shock pulse is attempted. The characteristic curve of airflow acceleration was obtained by simulating the designed nozzle, and the distribution of pressure, velocity and turbulence intensity of the nozzle was obtained by the VOF Level Set model of gas-liquid two-phase tight coupling. The three dimensional model of supersonic atomization nozzle was simulated, and the three dimensional flow field of air mist entrainment was obtained.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD714.4

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