本文選題：掘進工作面　切入點：紊動特性　出處：《煤炭學(xué)報》2017年08期

【摘要】：掘進工作面附壁射流具有置換和摻混雙重作用,體現(xiàn)為流場的時均和紊動特性。射流的紊動在瓦斯粉塵的遷移擴散中起著關(guān)鍵性作用,如工作面粉塵的懸浮運動完全靠風(fēng)流的紊動得以維持。由于紊動本身的復(fù)雜性以及實驗設(shè)備的限制,以往對獨頭巷附壁射流的研究一般停留在時均量上,對紊動量的認(rèn)識還不夠深入。為此,采用三維激光多普勒測速儀,在獨頭巷射流通風(fēng)實驗?zāi)Ｐ蛢?nèi),對三維脈動風(fēng)速進行了測量。根據(jù)紊流統(tǒng)計理論,分析得到了風(fēng)流的各向紊動強度,并對紊動強度的分布規(guī)律和量級進行了研究。結(jié)果表明:受限條件下,由于回流存在,射流的紊動在射流區(qū)和回流區(qū)都很劇烈,3個方向的紊動強度具有量級相同和各向異性的特點。在射流剪切層內(nèi),紊動強度從射流軸線到射流邊界呈先增后減趨勢;在射流剪切層以外的回流區(qū),紊動整體變化不明顯,始終維持著與平均風(fēng)速大小相當(dāng)?shù)膹姸�。流場�?nèi)較大的速度梯度導(dǎo)致流層之間剪切失穩(wěn)是形成劇烈紊動的重要原因。由于紊動具有與平均風(fēng)速相近的強度,在研究獨頭巷風(fēng)流排污效率、瓦斯粉塵運移規(guī)律等問題時,無論理論分析還是數(shù)值計算,都應(yīng)對運動方程中的速度脈動項給予充分重視。
[Abstract]:The wall jet in tunneling face has the dual functions of displacement and mixing, which is embodied in the time-averaged and turbulent characteristics of the flow field. The turbulence of the jet plays a key role in the migration and diffusion of gas dust. If the suspended movement of dust in working face is completely sustained by the turbulence of air flow, due to the complexity of turbulence itself and the limitation of experimental equipment, the previous researches on the wall jet of single head roadway generally stayed on the time average. For this reason, the three-dimensional laser Doppler velocimeter is used to measure the three-dimensional fluctuating wind velocity in the experimental model of jet ventilation in a single-headed roadway, according to the statistical theory of turbulent flow. The turbulence intensity in different directions of wind flow is obtained, and the distribution law and order of magnitude of turbulence intensity are studied. The results show that: under restricted conditions, due to the existence of reflux, In the jet shear layer, the turbulence intensity increases first and then decreases from the jet axis to the jet boundary. In the circumfluence zone outside the jet shear layer, the overall turbulence change is not obvious. The shear instability between the flow layers caused by the large velocity gradient in the flow field is an important reason for the violent turbulence. The turbulence has the intensity similar to the average wind speed. Both theoretical analysis and numerical calculation should pay enough attention to the velocity pulsation term in the motion equation when studying the efficiency of draught discharge and gas dust migration in single-headed roadway.
【作者單位】： 遼寧工程技術(shù)大學(xué)安全科學(xué)與工程學(xué)院;礦山熱動力災(zāi)害與防治教育部重點實驗室;新疆工程學(xué)院安全工程系;
【基金】：國家自然科學(xué)基金資助項目(51574142)
【分類號】：TD721

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