燃料液滴对流燃烧现象研究  

A Study on Convective Combustion of Fuel Droplets

作　　者：魏衍举[1] 邓胜才 张洁[1] 张亚杰 杨亚晶[2,3] 刘圣华[1] 杨朝辉 WEI Yanju;DENG Shengcai;ZHANG Jie;ZHANG Yajie;YANG Yajing;LIU Shenghua;YANG Zhaohui(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Aerospace Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Aerospace Propulsion Institute,Xi’an 710000,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安交通大学航天航空学院,西安710049 [3]西安交通大学机械结构强度与振动国家重点实验室,西安710049 [4]西安航天动力研究所,西安710000

出　　处：《西安交通大学学报》2021年第2期112-120,共9页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51576159);国家自然科学基金重大研究计划资助项目(91741110);陕西省重点研发计划资助项目(2019ZDLGY15-10)。

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。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：燃料液滴 对流燃烧 火焰 蒸气爆发 

分 类 号：O551.3[理学—热学与物质分子运动论]