煤矿井下气水喷雾雾化特性实验研究

发布时间：2018-03-17 04:23

  本文选题：气水喷雾　切入点：喷嘴流量　出处：《煤炭学报》2017年05期 　论文类型：期刊论文

【摘要】：为了分析煤矿井下气水喷雾雾化特性,基于自行设计的气水喷雾实验平台,采用电磁流量计、空气质量流量计及马尔文实时高速喷雾粒度分析仪对空气雾化喷嘴流量特性、雾化粒度的空间分布规律及影响因素开展了实验研究。结果表明:随着供水压力的增加,喷嘴耗气量以指数形式不断递减,而耗水量以指数形式递增;喷嘴耗气量随供气压力以指数形式递增,而喷嘴耗水量基本呈现线性递减趋势。雾滴粒径沿喷嘴轴线方向不断增大;距离喷嘴较近的纵断面上,雾滴粒径沿径向不断增大,并呈现不对称分布;位于雾流中部的纵断面上,轴线附近区域雾滴粒径沿径向不断增大,而雾流外部区域雾滴粒径呈现沿重力方向增大的趋势;在靠近雾流末端衰减区内,雾滴粒径沿重力方向不断增大。供气压力一定时,雾滴粒径随着供水压力的增加呈现先增大后减小的变化规律,且供气压力越大所对应的拐点水压越高;随着供气压力的增加,雾滴粒径不断减小,且减小幅度随供气压力增加而有所下降。
[Abstract]:In order to analyze the atomization characteristics of air-water spray in coal mine, based on the air-water spray experimental platform designed by ourselves, electromagnetic Flowmeter, Air quality Flowmeter and Ma Erwen real-time high-speed spray particle size analyzer were used to analyze the flow characteristics of air-atomizing nozzle. The spatial distribution of atomization particle size and its influencing factors were studied experimentally. The results show that with the increase of water supply pressure, the nozzle gas consumption decreases exponentially, while the water consumption increases exponentially. The gas consumption of the nozzle increases exponentially with the air supply pressure, and the water consumption of the nozzle decreases linearly. The droplet size increases along the axis of the nozzle, and on the longitudinal section near the nozzle, the droplet size increases along the radial direction. In the longitudinal section of the middle of the fog flow, the diameter of droplet in the area near the axis increases along the radial direction, while the diameter of the droplet in the outer region of the flow increases along the direction of gravity, and in the attenuation region near the end of the fog flow, the droplet size increases along the direction of gravity. The diameter of droplet increases along the direction of gravity. When the supply pressure is constant, the diameter of droplet increases first and then decreases with the increase of water supply pressure, and the higher the pressure of supply gas is, the higher the water pressure is at the corresponding inflection point, and the higher the pressure of supplying gas is, The particle size of droplet decreases and the decreasing amplitude decreases with the increase of gas supply pressure.
【作者单位】： 湖南科技大学南方煤矿瓦斯与顶板灾害控制安全生产重点实验室;湖南科技大学煤矿安全开采技术湖南省重点实验室;
【基金】：国家自然科学基金资助项目(U1361118,51574123) 中国博士后科学基金资助项目(2015M582118)
【分类号】：TD714.41
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本文编号：1623157