A Study on Convective Combustion of Fuel Droplets

被引：0
|
作者：
Wei Y. [1 ]
Deng S. [1 ]
Zhang J. [1 ]
Zhang Y. [1 ]
Yang Y. [2 ,3 ]
Liu S. [1 ]
Yang Z. [4 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[2] School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an
[3] State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an
[4] Xi'an Aerospace Propulsion Institute, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2021年 / 55卷 / 02期
关键词：
Convective combustion; Flame; Fuel droplet; Steam explosion;
D O I：
10.7652/xjtuxb202102013
中图分类号：
学科分类号：
摘要：
An experimental platform of droplet convective combustion is built, and the fuel droplet convective combustion experiment is carried out by using the flying drop method. The flame structure image of droplet combustion and the distance between flame and droplet under different flame stages are obtained. At the same time, the phenomenon of steam explosion is explored, and the generation mechanisms of single steam explosion and continuous steam explosion are clarified. The results show that, with the increase of droplet velocity, the flame structure of droplet combustion changes from full envelope flame to boundary layer flame. After the formation of boundary layer flame, there are two types of transition: boundary layer flame becoming unstably extinct and boundary layer flame converting into cone flame; before the formation of boundary layer flame, the transition points of droplet flame structure are basically the same under all working conditions; and the steam explosion phenomenon is caused by the flame contacting the droplet. After the flame contacts the droplet, the droplet temperature rises suddenly, and a large number of droplets evaporate in a short period of time, thus forming steam explosion combustion. The frequency of continuous steam explosion is equivalent to the frequency of Karman vortex street around the droplet, and the generation of continuous steam explosion is mainly affected by the Karman vortex street effect of droplet flow around the droplet. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：112 / 120
页数：8
相关论文
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