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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.
Plane laser-induced fluorescence (PLIF) was used to investigate the turbulent mixing conditions of horizontal opposed two-way impact flow mixer in submerged condition. Reynolds number (Re), nozzle spacing, nozzle inner diameter and inlet velocity ratio On the effect of mixing, the results show that when the nozzle spacing L increases from d ’to 3d’ under symmetric impact (d ’is the average value of the inner diameters of two nozzles), the mixing time decreases; when L increases from 3d’ to 5d ’ The mixing time is increased, the mixing time is the smallest when L = 3d ’, the nozzle inner diameter is increased from 6 mm to 14 mm when the inlet of both ends is Re = 17544, the mixing time decreases and the decreasing trend gradually slows down; 0.71 to 1.67, the mixing time decreases first and then increases, and the mixing time is the smallest when the speed ratio is 1; the mixing time decreases when the Reynolds number Re increases from 7519 to 40936. Under the symmetric impact, the mixing effect at L = 3d ’ The best, increase the nozzle diameter and Reynolds number can significantly improve the mixing effect.