单液滴破碎空间尺寸分布特性的实验研究

发布时间：2018-05-09 03:14

本文选题：均匀气流 + 单液滴　；参考：《推进技术》2016年06期

【摘要】：为了研究液滴破碎后颗粒云空间尺寸分布的机理特性,通过试验方法并建立相应的均匀性指标数学模型,分析了不同We数对液滴破碎后颗粒群空间分布均匀性的影响。结果表明:(1)液滴袋状破碎后颗粒分布类似于袋形的蜂窝结构,并以类似爆破的形式向后方外围扩散分离。(2)多模式破碎后颗粒群为类似于"树"形结构的颗粒分布,前端有分布密集、粒径较小的聚集团,后方分布着大范围的颗粒群。(3)剪切破碎后颗粒群为类似"桶"形的颗粒分布,外围分布着大量颗粒,而内部分布较为复杂。(4)在We数为10~70时,颗粒群的离散率在整体上是呈现先升高后下降再升高的趋势。当We数为30和60时,两个方向上的离散率存在较大差异,而三种不同的破碎模式中,剪切破碎均匀性表现最好。
[Abstract]:In order to study the mechanism and characteristics of the spatial distribution of droplet cloud, the effects of different We numbers on the spatial distribution of droplet cluster were analyzed by means of experimental method and the corresponding mathematical model of uniformity index. The results show that the particle distribution is similar to the bagging honeycomb structure, and diffuses to the rear periphery in the form of blasting. The particle group after multi-mode fragmentation is similar to that of the "tree" structure, and the particle distribution is similar to that of the "tree" structure, and the distribution of the particles is similar to that of the "tree" structure. At the front end, there are clusters with dense distribution and smaller particle size, with a large range of particles distributed in the rear.) after shearing and crushing, the particle group is similar to the "barrel" shape, and a large number of particles are distributed in the periphery. When we number is 10 ~ 70, the dispersion rate of particle group increases firstly and then decreases and then increases. When we number is 30 and 60, there is a great difference in the discrete rate in the two directions, and the shear breakage uniformity is the best among the three different crushing modes.
【作者单位】：南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室;
【分类号】：V231.23

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