不同气量分配下声激励对中心分级旋流火焰动力学的影响  

Effects of acoustic excitation on the dynamics of centrically-staged swirling stratified flames under different air split ratios

作　　者：魏为 许全宏[2,3] 苏童 韩啸[2,3] 杨思恒 周宇晨 WEI Wei;XU Quanhong;SU Tong;HAN Xiao;YANG Siheng;ZHOU Yuchen(School of Energy and Power Engineering,Beihang University,Beijing 102206,China;Research Institute of Aero-Engine,Beihang University,Beijing 102206,China;National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,Beihang University,Beijing 102206,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京102206 [2]北京航空航天大学航空发动机研究院,北京102206 [3]北京航空航天大学航空发动机气动热力国家级重点实验室,北京102206

出　　处：《航空动力学报》2022年第8期1607-1619,共13页Journal of Aerospace Power

基　　金：国家科技重大专项(2017-Ⅲ-0007-0032)。

摘　　要：采用高速摄像拍摄火焰化学自发光和本征正交分解(POD)法研究了多激励频率下中心分级旋流分层火焰的宏观结构和动力学特性。结果表明:随着气量分配比的增加,火焰宏观结构逐渐沿径向方向扩张,火焰分层现象变得更加明显。激励频率的变化对火焰宏观结构的影响较小。POD分析结果表明:外激频率为200 Hz时火焰脉动最明显。随着主燃级气量占比的增加,释热脉动在激励的作用下沿轴向方向减弱,在径向上出现极值交替且振荡变强。Macrostructures and dynamic characteristics of concentrically-staged swirling stratified flames under multiple excitation frequencies were studied using high-speed CH*chemiluminescence and proper orthogonal decomposition(POD).Results showed that the flame expanded radially with more pronounced stratification as air split ratio increased,whereas the excitation frequency played an insignificant role.POD analysis revealed that among the conducted external excitation cases,the most intense flame oscillations were observed at the excitation frequency of 200 Hz.With the increase of main stage air allocation,the heat release oscillation decreased along the axial direction.On the radial direction,however,local minima and maxima were alternately observed with stronger oscillations.

关 键 词：燃烧不稳定性 中心分级燃烧室 旋流火焰 火焰动力学 本征正交分解(POD) 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]