麻疯树油液滴微爆和蒸发特性试验  

Experimental Study on Micro-Explosion and EvaporationCharacteristics of Jatropha Oil Droplets

作　　者：王继刚 相飞飞 徐晶[1] 乔信起[2] Wang Jigang;Xiang Feifei;Xu Jing;Qiao Xinqi(School of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China;Key Laboratory of Power Machinery and Engineering,Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]扬州大学机械工程学院,江苏扬州225127 [2]上海交通大学动力机械与工程教育部重点实验室,上海200240

出　　处：《内燃机学报》2024年第1期44-52,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(52306167);江苏省自然科学基金资助项目(BK20220588)。

摘　　要：利用悬挂式液滴蒸发试验装置,结合高速背光成像技术,研究了麻疯树油液滴在高温环境(673、773、873、973和1073 K)下的微爆和蒸发特性,并对麻疯树油中的3种主要组分液滴的蒸发特性进行了分析.结果表明:麻疯树油液滴的微爆是由于内部组分的热解导致的,并且随环境温度的升高,其微爆强度增大.麻疯树油液滴在环境温度为673 K时,液滴稳定蒸发,蒸发过程包括初始膨胀阶段、平衡蒸发阶段和残留物蒸发阶段;在环境温度为773~1073 K时,液滴发生微爆,包含初始膨胀阶段、平衡蒸发阶段、微爆蒸发阶段和残留物蒸发阶段;当环境温度高于873 K时,首次观测到“蒸气羽流”和“蒸气云”现象,液滴蒸发速率大幅提高.The evaporation and micro-explosion characteristics of jatropha oil droplets under high temperature environment(673,773,873,973 and 1073 K)were carried out using high-speed backlit imaging technique.The droplet evaporation characteristics of three main components of jatropha oil were analyzed separately.The results show that the micro-explosion of jatropha oil droplets is caused by the pyrolysis of internal components,and the micro-explosion intensity increases with the increase of ambient temperature.At 673 K,the jatropha oil droplets undergo stable evaporation,which includes three stages of initial expansion,equilibrium evaporation and residue evaporation.At 773—1073K,the droplet undergoes micro-explosion,which includes four stages of initial expansion,equilibrium evaporation,micro-explosion evaporation and residual evaporation.When the ambient temperature is higher than 873 K,the phenomenon of"vapor plume"and"vapor cloud"is observed for the first time,and the droplet evaporation rate significantly increases.

关 键 词：麻疯树油 液滴 微爆 蒸发 机理 

分 类 号：S216.2[农业科学—农业机械化工程] TK6[农业科学—农业工程]