A Study on Convective Combustion of Fuel Droplets

doi:10.7652/xjtuxb202102013

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A Study on Convective Combustion of Fuel Droplets

更新时间：2025-07-09

- A Study on Convective Combustion of Fuel Droplets
- Vol. 55, Issue 2, Pages: 112-120(2021)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202102013
  CLC： O551.3
- Online First：10 February 2021，
  
  Published：2021
- 稿件说明：
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A Study on Convective Combustion of Fuel Droplets[J]. 2021, 55(2): 112-120.
DOI：

A Study on Convective Combustion of Fuel Droplets[J]. 2021, 55(2): 112-120. DOI： 10.7652/xjtuxb202102013.

摘要

本文搭建了液滴对流燃烧实验平台

利用飞滴法进行燃料液滴对流燃烧实验

得到液滴燃烧的火焰结构图像和不同火焰阶段火焰与液滴的距离

同时还对蒸气爆发现象进行了探究

阐明了单次蒸气爆发与连续蒸气爆发的产生机理。研究结果表明:随着液滴速度的增大

液滴燃烧的火焰结构从全包火焰转变成边界层火焰

边界层火焰形成后会产生2种类型的转变:边界层火焰不稳定熄灭和边界层火焰转变成倒锥形火焰; 在形成边界层火焰前

所有工况下液滴的火焰结构转变点基本相同; 蒸气爆发现象是由火焰接触液滴引起的

火焰接触液滴后液滴温度突然升高

短时间内液滴大量蒸发

进而形成蒸气爆发燃烧; 连续蒸气爆发的频率与液滴绕流卡门涡街频率相当

连续蒸气爆发的产生主要受液滴绕流卡门涡街效应的影响。

Abstract

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.

关键词

Keywords

references

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Related Author

马志豪 1

贾义 1

李智博 1

朱宇东 1

陈占耀 1

胡二江 2

Related Institution

河南科技大学车辆与交通工程学院

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