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化工学报  2015 

自吸式文丘里洗涤器引射特性及其影响因素

DOI: 10.11949/j.issn.0438-1157.20141131, PP. 99-104

Keywords: 自吸式文丘里洗涤器,引射量,静压分布,动量传递

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Abstract:

以自吸式文丘里洗涤器为研究对象,基于伯努利方程分析了影响其引射量的主要因素,并通过实验对各因素进行分析验证。结果表明,自吸式文丘里洗涤器的引射量主要取决于吸液口两侧的静压差、截面积、高度差以及液体在流动通道内的阻力系数。当文丘里洗涤器不引射液体时,液体流动通道出口截面上的静压力与喷嘴壁面处的压力相等,远高于喷嘴出口中心和出口平均压力;当文丘里洗涤器引射液体时,气液两相的动量交换作用,会在气液界面处产生额外的压力增量,并以压力波的形式向整个截面传递,导致有效的吸液压差进一步降低。当吸液压差较小时,液体的流通面积和阻力系数对引射量的影响明显,通过增大外套管与喷嘴面积比同时增大喷管出口直径的方法,一方面能够增大液体流通面积,另一方面也减小了液相流动阻力,对于改善液体引射量是有效的。

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