【摘要】：在礦井通風中,調節(jié)風窗是調整和優(yōu)化井下通風系統(tǒng)必不可少的調節(jié)設施之一,而因調節(jié)風窗的局部阻力影響導致風流在流經(jīng)調節(jié)風窗之后流場分布甚為復雜而紊亂,使得礦井通風中的相關參數(shù)測試不準確而導致通風系統(tǒng)優(yōu)化不合理。傳統(tǒng)的接觸式定點流速測量技術因測試時對流場產(chǎn)生干擾,導致測不準而不能真實反映井下瞬態(tài)流場分布特征。本文利用粒子圖像測速儀(PIV)對巷道調節(jié)風窗模型流場進行實驗測試,結合數(shù)值模擬及實驗礦井相互驗證和比較,可以反映調節(jié)風窗巷道全流場瞬態(tài)速度以及時均速度分布結構,獲得巷道流場縱向截面風流分布特征及調節(jié)風窗相關參數(shù)的關系式,為生產(chǎn)現(xiàn)場及調節(jié)風窗研究工作者提供指導。PIV實驗和數(shù)值模擬結果表明,巷道風流經(jīng)過調節(jié)風窗之前風流流場基本不變,而經(jīng)過調節(jié)風窗之后風流流場變得異常紊亂,在調節(jié)風窗下隅角產(chǎn)生形態(tài)不一的回流旋渦區(qū);風流經(jīng)過調節(jié)風窗后的回流區(qū)長度與巷道入口風流速度大小無關,與斷面比基本呈對數(shù)關系;調節(jié)風窗的局部阻力系數(shù)受雷諾數(shù)的影響較小,而斷面比對局部阻力系數(shù)的影響較大,且二者呈線性遞減關系,并得到擬合函數(shù)關系式。在理論和實驗研究的基礎上,利用回流區(qū)長度及局部阻力系數(shù)關系式對實驗礦井中的調節(jié)風窗進行驗證測試,結果表明,實驗礦井測試所得的調節(jié)風窗回流區(qū)長度值與PIV實驗所得關系式計算值基本相符;調節(jié)風窗局部阻力的實驗測試值與局部阻力系數(shù)公式計算所得局部阻力值的相對誤差較小,驗證了局部阻力系數(shù)ξ函數(shù)關系式的正確性,可將此關系式應用于井下生產(chǎn)現(xiàn)場調節(jié)風窗局部阻力的測定。
[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.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD724

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