【摘要】：在礦井通風(fēng)中,調(diào)節(jié)風(fēng)窗是調(diào)整和優(yōu)化井下通風(fēng)系統(tǒng)必不可少的調(diào)節(jié)設(shè)施之一,而因調(diào)節(jié)風(fēng)窗的局部阻力影響導(dǎo)致風(fēng)流在流經(jīng)調(diào)節(jié)風(fēng)窗之后流場(chǎng)分布甚為復(fù)雜而紊亂,使得礦井通風(fēng)中的相關(guān)參數(shù)測(cè)試不準(zhǔn)確而導(dǎo)致通風(fēng)系統(tǒng)優(yōu)化不合理。傳統(tǒng)的接觸式定點(diǎn)流速測(cè)量技術(shù)因測(cè)試時(shí)對(duì)流場(chǎng)產(chǎn)生干擾,導(dǎo)致測(cè)不準(zhǔn)而不能真實(shí)反映井下瞬態(tài)流場(chǎng)分布特征。本文利用粒子圖像測(cè)速儀(PIV)對(duì)巷道調(diào)節(jié)風(fēng)窗模型流場(chǎng)進(jìn)行實(shí)驗(yàn)測(cè)試,結(jié)合數(shù)值模擬及實(shí)驗(yàn)礦井相互驗(yàn)證和比較,可以反映調(diào)節(jié)風(fēng)窗巷道全流場(chǎng)瞬態(tài)速度以及時(shí)均速度分布結(jié)構(gòu),獲得巷道流場(chǎng)縱向截面風(fēng)流分布特征及調(diào)節(jié)風(fēng)窗相關(guān)參數(shù)的關(guān)系式,為生產(chǎn)現(xiàn)場(chǎng)及調(diào)節(jié)風(fēng)窗研究工作者提供指導(dǎo)。PIV實(shí)驗(yàn)和數(shù)值模擬結(jié)果表明,巷道風(fēng)流經(jīng)過調(diào)節(jié)風(fēng)窗之前風(fēng)流流場(chǎng)基本不變,而經(jīng)過調(diào)節(jié)風(fēng)窗之后風(fēng)流流場(chǎng)變得異常紊亂,在調(diào)節(jié)風(fēng)窗下隅角產(chǎn)生形態(tài)不一的回流旋渦區(qū);風(fēng)流經(jīng)過調(diào)節(jié)風(fēng)窗后的回流區(qū)長度與巷道入口風(fēng)流速度大小無關(guān),與斷面比基本呈對(duì)數(shù)關(guān)系;調(diào)節(jié)風(fēng)窗的局部阻力系數(shù)受雷諾數(shù)的影響較小,而斷面比對(duì)局部阻力系數(shù)的影響較大,且二者呈線性遞減關(guān)系,并得到擬合函數(shù)關(guān)系式。在理論和實(shí)驗(yàn)研究的基礎(chǔ)上,利用回流區(qū)長度及局部阻力系數(shù)關(guān)系式對(duì)實(shí)驗(yàn)礦井中的調(diào)節(jié)風(fēng)窗進(jìn)行驗(yàn)證測(cè)試,結(jié)果表明,實(shí)驗(yàn)礦井測(cè)試所得的調(diào)節(jié)風(fēng)窗回流區(qū)長度值與PIV實(shí)驗(yàn)所得關(guān)系式計(jì)算值基本相符;調(diào)節(jié)風(fēng)窗局部阻力的實(shí)驗(yàn)測(cè)試值與局部阻力系數(shù)公式計(jì)算所得局部阻力值的相對(duì)誤差較小,驗(yàn)證了局部阻力系數(shù)ξ函數(shù)關(guān)系式的正確性,可將此關(guān)系式應(yīng)用于井下生產(chǎn)現(xiàn)場(chǎng)調(diào)節(jié)風(fēng)窗局部阻力的測(cè)定。
[Abstract]:In mine ventilation, adjusting air window is one of the necessary adjustment facilities for adjusting and optimizing underground ventilation system. However, the distribution of air flow field after flow through the adjusting air window is very complicated and disordered because of the influence of local resistance of regulating air window. The measurement of relevant parameters in mine ventilation is not accurate and the optimization of ventilation system is unreasonable. The traditional contact fixed-point velocity measurement technique can not truly reflect the distribution characteristics of transient flow field in the downhole due to the interference of the flow field during the measurement, which leads to the uncertainty of the measurement. In this paper, the particle image velocimeter (PIV) is used to test the flow field of the wind window model of roadway, and the numerical simulation is combined with the experimental mine to verify and compare each other. It can reflect the structure of adjusting the transient velocity of the whole flow field and the structure of the velocity distribution in time, and obtain the relationship between the air flow distribution characteristics of the longitudinal section of the tunnel flow field and the relevant parameters of adjusting the wind window. The results of PIV experiment and numerical simulation show that the airflow field of roadway is basically unchanged before the air window is adjusted, but the airflow field becomes abnormal after adjusting the wind window. At the lower corner of the adjusting window, the reflux vortex region with different forms is produced. The length of the return zone after adjusting the wind window has nothing to do with the velocity of the air flow at the entrance of the roadway, but a logarithmic relationship with the cross section ratio. The influence of Reynolds number on the local drag coefficient of the regulating wind window is small, while the influence of the section ratio on the local resistance coefficient is greater, and the relationship between them is linear decreasing, and the fitting function relationship is obtained. On the basis of theoretical and experimental research, the relationship between the length of the reflux zone and the local resistance coefficient is used to verify and test the regulating air window in the experimental mine. The results show that, The length of the reflux zone of the adjusting air window obtained from the test mine is basically in accordance with the calculated value of the relation formula obtained by the PIV experiment. The relative error between the experimental test value and the local resistance coefficient formula calculated by adjusting the local resistance of the wind window is relatively small, which verifies the correctness of the functional formula of the local resistance coefficient 尉. The relationship can be applied to the determination of local resistance of air window in downhole production.
【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】：2017
【分類號(hào)】：TD724

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