摘要
为获得同轴离心式喷嘴燃烧动力学特性,开展了喷注单元燃烧实验研究。实验中增加混合比,燃烧室从燃烧噪声状态转变为规则的间歇性压力振荡状态。减小混合比,在稳定性边界附近出现了随机间歇性压力振荡。通过引入慢变量振荡,建立了燃烧系统的随机动力学模型,分析了系统线性衰减率、噪声强度和慢变量振荡耦合强度等参数对系统动力学的影响。结果表明,理论模型较好的描述了实验中出现的间歇性压力振荡现象,引入慢变量振荡使系统出现了较规则的间歇性压力振荡,规则程度与噪声强度有关。此外,高强度的噪声可以引发随机间歇性压力振荡。
An experimental research was carried out to investigate the combustion dynamic of a swirl coaxial injector in a cylindrical combustor.With increasing mixing ratio,the dynamic behavior of combustor transits from combustion noise to regular intermittent pressure oscillation.When mixing ratio is reduced,intermittent pressure oscillations appear stochastically near the stability boundary.By introducing a slow time scale in the form of a low frequency periodic oscillation,the stochastic dynamic models of the combustion system is established.The effects of linear damping rate,noise intensity and the coupling strength of the slow variable with acoustic velocity on the system dynamics are analyzed.The results show that the theoretical model is successful in replicating the dynamical features observed in experiments.Regular intermittent pressure oscillation can be caused by slow variable oscillation,and its degrees of regularity are also related to the noise intensity.In addition,high intensity noise can trigger stochastic intermittent pressure oscillations.
作者
杨尚荣
王勇
张锋
杨宝娥
王牧昕
YANG Shangrong;WANG Yong;ZHANG Feng;YANG Baoe;WANG Muxin(Science and Technology on Liquid Rocket Engine Laboratory,Xi’an Aerospace Propulsion Institute,Xi’an 710100,China;210 Institute,The Sixth Academy of China Aerospace Science&Industry Corp.,Xi’an 710065,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2022年第7期1986-1991,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51606138)。
关键词
同轴离心式喷嘴
燃烧不稳定
间歇性振荡
快慢系统
swirl coaxial injector
combustion instability
intermittent pressure oscillation
fast slow system
