柴油、甲醇和水三相乳化液粒径分布预测模型及实验验证  

A Predictive Model and Experimental Verification for Droplet Size Distribution of Diesel-Methanol-Water Emulsion in Sprays

作　　者：王武强[1] 吴东垠[1] 程亮[1,2] 严俊杰[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]中国新时代国际工程公司,西安710018

出　　处：《西安交通大学学报》2016年第5期65-71,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51376148)

摘　　要：为了研究柴油、甲醇和水三相乳化液在不同启喷压力下的雾化特性,采用最大熵原理和实验相结合的方法分析了喷嘴启喷压力、乳化液配比和乳化剂等对其雾化粒径分布的影响。通过最大熵原理推导了三相乳化液雾化的概率密度函数,建立了三相乳化液的体积积分分布和累积体积分布理论模型,并与实验值进行了比较验证。研究表明：基于最大熵原理确定的理论模型和实际分布趋势基本一致,随着喷嘴启喷压力的增大,Sauter平均直径随之减小,大液滴份额减少,小液滴份额增加,峰值朝粒径较小的方向移动,并且采用较小分散相含量和亲油性较弱乳化剂的乳化液雾化效果相对较好;雾化后的液滴直径主要分布在10~60μm之间,峰值在30μm左右,峰值附近理论值与实验值的相对误差最大,理论值分布较为集中,实验值分布较为分散;在累积体积分布中,随着启喷压力的增大,累积分布曲线变陡,累积体积理论值较实验值更快到达100%。The spraying characteristics of the diesel-methanol-water emulsion were researched at different injection pressures by combining the principle of maximum entropy with experiments.The influences of the injection pressure,dispersed phase content and emulsifier on the spray＇s droplet size distribution were analyzed.The spray＇s probability density function of the emulsion was deduced through the principle of maximum entropy.Furthermore,a volume integral distribution model and a cumulative volume distribution model were established,and compared with the experimental results.The research shows that the distribution trend of the theoretical model based on the maximum entropy is consistent with the experimental distribution.With the increase of the injection pressure,the spray＇s Sauter mean diameter and the content of large droplets are reduced,while the content of small droplets is increased,and the peak of the distribution shifts to the smaller droplet diameter.Smaller dispersed phase content and weaker lipophilicity emulsifier may lead to a better atomization effect.The droplet diameter ranges from10μm to 60μm,and the peak value is 30μm.And near the peak,there is a maximum relative error between the theoretical and experimental diameters,and the distribution of theoretical values is more concentrated than the experimental values.With the increase of the injection pressure,the cumulative volume distribution curve becomes steeper,and the theoretical cumulative volume distribution reaches 100%faster than the experimental one.

关 键 词：最大熵原理 乳化液 启喷压力 体积分布 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]