摘要
采用大涡模拟(LES)方法对比了高低旋流的预混燃烧特性,并分析了低旋流的稳燃机理。结果表明:LES耦合部分搅拌反应燃烧模型(PaSR)可以准确的捕捉旋流预混燃烧的细小火焰结构和流场分布。不同旋流强度引发不同的流场特性,低旋流诱发较弱的回流区,而高旋流会诱发很强的回流区,这种强烈的流场特征往往会引起振动频率极低的进动涡核拟序结构(PVC)。通过涡脱落和燃烧温度分布的瞬时耦合关系,发现火焰剪切层引起的内外涡脱落频率差是低旋流火焰稳定的最主要因素,低旋流燃烧受涡旋结构的影响交替出现W和V型火焰。
The large-eddy simulation(LES)method was used to compare the premixed combustion characteristics of high and low swirls,and the flame stability mechanism of low swirl was analyzed.Results showed that LES coupling with PaSR combustion model can accurately capture the small structures and flow field distribution of premixed flame.The low swirl flow had a weak recirculation zone(sometimes just a low velocity zone),while a high swirl flow produced a strong recirculation zone with a low frequency vibration of the precession vortex core(PVC).By analyzing the change of vortex and flame temperature field,it was found that vortices generated from swirl and center jet flow were the main factors of stability mechanism to stabilize flame in the low velocity region,forming alternating W and V flame.
作者
刘英杰
刘潇
周波
张志浩
郑洪涛
LIU Yingjie;LIU Xiao;ZHOU Bo;ZHANG Zhihao;ZHENG Hongtao(Aero Engine Academy of China,Aero Engine Corporation of China,Beijing 101304,China;College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China;Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen Guangdong 518055,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2020年第2期298-304,共7页
Journal of Aerospace Power
关键词
大涡模拟
低旋流
涡旋
进动涡核
火焰稳定
large eddy simulation
low swirl
vortex
precession vortex core
flame stability
