中心分级旋流燃烧室不稳定燃烧动态压力信号特征分析  

Characteristic analysis of dynamic pressure signal of unstable combustion in central staged swirl combustor

作　　者：王旭怀 刘勇[1] 张祥 杨晨 李昊 WANG Xuhuai;LIU Yong;ZHANG Xiang;YANG Chen;LI Hao(Key Laboratory of Aero-engine Thermal Environment and Structure,Ministry of Industry and Information Technology,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院航空发动机热环境与热结构工业和信息化部重点实验室,南京210016

出　　处：《航空动力学报》2023年第12期2883-2894,共12页Journal of Aerospace Power

基　　金：中国航发自主创新专项资金项目(ZZCX-2019-009)。

摘　　要：针对中心分级旋流模型燃烧室中出现的不稳定燃烧特征进行试验研究,在常压试验中同步采集了不同工况下燃烧室动态压力脉动信号、释热率脉动信号和高速火焰图像信号。通过经验模态分解(EMD)对压力脉动信号进行分析,发现脉动特征主要集中在前3阶本征模态(IMF)中。这些IMF通过快速傅里叶变换(FFT)进行主频分析后发现分别与释热率脉动、气流旋流脉动和火焰不稳定脉动特征频谱吻合。进而可以判断通过EMD可以从单一燃烧室压力脉动信号中分解出3个主要物理过程的脉动特征,为进一步分析工程级燃烧室试验中振荡燃烧的诱发机制和燃烧诊断提供了数据处理方法。The unsteady combustion characteristics in the central staged swirl model combustor were experimentally studied.The dynamic pressure pulsation signal,heat release rate pulsation signal and highspeed flame image signal of the combustor under different working conditions were synchronously collected in the atmospheric pressure test.The pressure pulsation signal was analyzed by empirical mode decomposition(EMD),finding that the pulsation characteristics were mainly concentrated in the first three intrinsic mode function(IMF).These IMFs were found to be consistent with the characteristic spectra of heat release rate pulsation,airflow swirl pulsation and flame instability pulsation,respectively,after the main frequency analysis by fast Fourier transform(FFT).Furthermore,it can be judged that the pulsation characteristics of three main physical processes can be decomposed from the single pressure pulsation signal of combustor through EMD decomposition,thus providing a data processing method for further analyzing the induction mechanism and combustion diagnosis of oscillatory combustion in engineering combustor test.

关 键 词：不稳定燃烧 火焰不稳定 经验模态分解 本征模态函数 傅里叶变换 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程] TK16[动力工程及工程热物理—热能工程]