摘要
为了研究进口温度对分层旋流火焰燃烧不稳定性的影响,实验在单头部燃烧室上测量了不同进口温度下的动态压力,并采用理论分析了进口温度对压力振荡的影响。实验结果显示:该燃烧室出现的燃烧不稳定性呈现的是Helmholtz模态,并且随着进口温度从530K增加至650K时,压力脉动主频增加,幅值减小。分析表明:进口温度的增加会增强燃油的雾化和蒸发,进而加强其与空气的掺混均匀性,减小了当量比脉动,从而抑制了燃烧不稳定性,压力振荡幅值减小。
In order to investigate the effects of inlet temperature on the combustion instability in stratified swirl combustor,the dynamic pressure under various inlet temperatures was tested using a single doom combustor,and the effects of inlet temperature on pressure oscillation were analyzed using a theory.The experimental results showed that the mode of combustion instability in this combustor was Helmholtz mode.With the increase of inlet temperature from 530 Kto 650 K,the amplitude of pressure oscillation decreased.Analysis showed that the increase of inlet temperature can enhance fuel atomization and evaporation and then strengthen its mixing with air,making equivalence-ratio oscillation less impossible.Therefore combustion instability was less prone to occur and the dynamic pressure amplitude was smaller.
作者
王志超
林宇震
韩啸
吕丽君
WANG Zhichao;LIN Yuzhen;HAN Xiao;LU Lijun(National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2018年第10期2434-2441,共8页
Journal of Aerospace Power
关键词
进口温度
分层旋流火焰
燃烧不稳定性
雾化和蒸发
当量比脉动
inlet temperature
stratified swirl flame
combustion instability
atomization and evaporation
equivalence-ratio oscillation
