苄基叠氮-正十六烷液滴蒸发特性试验研究  

Experimental Study on Evaporation Characteristics of Benzyl Azide-Hexadecane Droplet

作　　者：史建伟[1] 赵长禄[1] 韩恺[1] 付耿[1] 杨波[1] 马小康[1] 章振宇[1] 

机构地区：[1]北京理工大学机械与车辆学院车辆动力系统技术重点学科实验室,北京100081

出　　处：《工程热物理学报》2015年第11期2527-2530,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51306021)

摘　　要：为了排除多组分燃油沸点差异性的影响,本文利用正十六烷代替柴油,采用挂滴法研究了不同环境温度下30%配比苄基叠氮-正十六烷液滴的蒸发特性。试验结果表明,在低温423 K下,由于苄基叠氮化合物没有发生分解反应,30%苄基叠氮-正十六烷液滴蒸发特征与正十六烷基本相同,表现出两阶段蒸发特征。在高温723 K下,分解反应的发生使得30%苄基叠氮-正十六烷蒸发的阶段性特征发生根本改变,归一化液滴直径平方曲线呈现出波动,液滴生存时间缩短。同时,在蒸发过程还观察到气泡产生、膨胀和喷气现象。而且,随着环境温度的升高,苄基叠氮化合物分解阶段Δt_(bah2)的加速是缩短液滴生存时间的主要原因。In order to avoid the effect of the multi-component property of fuel,hexadecane is used to represent diesel fuel.The evaporation characteristics of 30% benzyl azide-hexadecane droplets at differernt temperatures are experimentally investigated using suspended droplet device.The results shows that,owning to no decomposition reaction of azides,the evaporation processes of 30% benzyl azide-hexadecane and droplet are basically same at 423 K,which includes two evaporation phases.The occurrence of decomposition reaction leads the evaporation characteristics of 30% benzyl azide-hexadecane droplet change at 723 K and puffing can be observed during the evaporation process,which leads the droplet lifetime decrease.Meanwhile,with the increase of ambient temperature,it can be concluded that the faster evaporation during Δt_（bah2） is the main reason that caused the shorter droplet lifetime.

关 键 词：苄基叠氮 正十六烷 挂滴法 液滴蒸发 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]