水平对置双向撞击流混合器的混合效果

发布时间：2018-02-10 03:19

本文关键词： 撞击流混合效果平面激光诱导荧光技术湍流　出处：《过程工程学报》2017年05期 　论文类型：期刊论文

【摘要】：采用平面激光诱导荧光技术(PLIF)对浸没状态下水平对置双向撞击流混合器在湍流时的混合情况进行了研究,考察了进口处雷诺数(Re)、喷嘴间距、喷嘴内径、进口速度比对混合效果的影响.结果表明,对称撞击下,喷嘴间距L从d’增加至3d’时(d’为两喷嘴内径平均值),混合时间减小;L由3d’增加至5d’时,混合时间增加,L=3d’时混合时间最小.两端进口处Re=17544时,喷嘴内径由6 mm增至14 mm,混合时间减小且减小趋势逐渐放缓;两喷嘴进口速度比由0.71增至1.67时,混合时间先减小后增加,速度比为1时,混合时间最小;雷诺数Re由7519增至40936时,混合时间减小.对称撞击下,L=3d’时混合效果最好,增加喷嘴内径及雷诺数可显著提高混合效果.
[Abstract]:Plane laser-induced fluorescence technique (PLIFF) was used to study the mixing of horizontal contra-directional impinging flow mixers in turbulent flow. The Reynolds number, nozzle spacing and nozzle diameter at the inlet were investigated. The effect of inlet velocity ratio on the mixing effect. The results show that when the nozzle spacing L increases from d'to 3 d 'under symmetric impact, it is the average value of the inner diameter of two nozzles, and the mixing time decreases from 3 d' to 5 d'. When the mixing time increased, the mixing time was the smallest. When Re17544 was at both ends, the inner diameter of the nozzle increased from 6 mm to 14 mm, the mixing time decreased and the decreasing trend gradually slowed down, and when the inlet velocity ratio of the two nozzles increased from 0.71 to 1.67, the mixing time decreased first and then increased. The mixing time decreases when the velocity ratio is 1:00 and the Reynolds number increases from 7519 to 40936. The mixing effect is the best when the velocity ratio is 1:00, and the mixing effect can be improved by increasing the nozzle diameter and Reynolds number.
【作者单位】：沈阳化工大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(编号:21476141)
【分类号】：TQ051.71

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