航空学报 > 2016, Vol. 37 Issue (3): 847-853   doi: 10.7527/S1000-6893.2015.0133

煤油凝胶单液滴燃烧特性试验

杨大力, 夏智勋, 胡建新, 肖云雷   

  1. 国防科学技术大学 高超声速冲压发动机技术重点实验室, 长沙 410073
  • 收稿日期:2015-03-31 修回日期:2015-05-12 出版日期:2016-03-15 发布日期:2015-05-25
  • 通讯作者: 夏智勋,Tel.:0731-84576450,E-mail:zxxia@nudt.edu.cn E-mail:zxxia@nudt.edu.cn
  • 作者简介:杨大力,男,硕士研究生。主要研究方向:凝胶推进剂燃烧特性。E-mail:18628197569@163.com;夏智勋,男,博士,教授,博士生导师。主要研究方向:固体火箭技术,高超声速飞行器总体技术和水冲压发动机技术。Tel:0731-84576450,E-mail:zxxia@nudt.edu.cn;胡建新,男,博士,教授,硕士生导师。主要研究方向:固体火箭技术,冲压发动机技术。E-mail:devydevy1975@hotmail.com

Experimental study on ignition and combustion characteristics of single kerosene gel droplet

YANG Dali, XIA Zhixun, HU Jianxin, XIAO Yunlei   

  1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
  • Received:2015-03-31 Revised:2015-05-12 Online:2016-03-15 Published:2015-05-25

摘要:

利用二氧化碳激光器点火装置及高分辨率高速成像系统,开展了煤油凝胶单液滴在空气中的点火燃烧试验,观察了凝胶液滴在燃烧过程中的形态变化,为进行凝胶冲压发动机的总体设计提供依据。试验结果表明,煤油凝胶液滴的燃烧经历了煤油的蒸发燃烧、气泡产生、胶凝层形成、胶凝层破裂、微爆等物理化学过程,基本满足D2定律。分析了胶凝剂含量、硼含量对含硼煤油凝胶燃烧过程的影响。当硼含量一定时,随着胶凝剂含量的增加,含硼凝胶的稳定燃烧相对时间增加,但微爆过程更加剧烈;当胶凝剂含量一定时,随着硼含量的增加,含硼凝胶液滴的稳定燃烧相对时间缩短,微爆现象更加剧烈。

关键词: 煤油凝胶, 单液滴, 纳米硼颗粒, 燃烧, 微爆

Abstract:

CO2 laser ignition and combustion setup is designed, and a series of experiments of single kerosen gel droplet ignition and combustion is conducted, with the help of a high resolution and high speed image formation system. During the ignition and combustion, the structure of single gel droplet is observed directly and clearly. The results indicate that the process of ignition and combustion of a single gel droplet includes:the evaporation and combustion of kerosene droplet, bubbles occurence, gellant layer occurence, diruption of gellant layer, and microexplo-sion of droplet, which basically follows the D2 law. Then we compared the differences of varied percentages of gellant and boron particles. We found that the steady combustion process tend to be relatively longer when increasing the percentage of gellant, but the microexplosion would be more active, the steady combustion process tend to be shorter when increasing the percentage of boron particles, and the microexplosion also tends to be more active also.

Key words: kerosene gel, single droplet, nano-boron particles, combustion, microexplosion

中图分类号: