Nonlinear Dynamic Characteristics of Turbulent Non-Premixed Acoustically Perturbed Swirling Flames

作     者：ZHOU Hao TAO Chengfei MENG Sheng CEN Kefa ZHOU Hao;TAO Chengfei;MENG Sheng;CEN Kefa

作者机构：State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2022年第31卷第3期

页      面：882-894页

核心收录：

学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学] 

基　　金：supported by National Science Fund for Distinguished Young Scholars(51825605) 

主　　题：flame-acoustic resonance non-linear time series analysis non-premixed burners intermittency dynamic characteristics 

摘      要：The main objective of this article was to experimentally investigate the dynamic response of diffusion flame under acoustic excitation in a laboratory-scale *** parametric variations of the burner,the burner inlet length and variation of the airflow rate,were *** results were analyzed through nonlinear time series analysis and several resonance characteristics were *** indicate that the flame-acoustic resonance only appears under certain frequencies together with the fuel tube *** characteristics of the combustion chamber and air inlet in the non-premixed burner indicate quasi-periodic or limit cycle oscillations,***-acoustic resonance would trigger the frequency and amplitude mode-transition in ***,the intermittency of flame heat release was observed under variation of inlet length and airflow rate in the burner;the 445 mm case shows more frequency peaks and fluctuations than the 245 mm *** typical flame forms were examined during the flame-acoustic resonance conditions,evolves from wrinkled flames to diverged flames,then evolves to reattached flames and finally to blow-off *** study proposed the practical application of nonlinear time-series analysis method as a detection tool for flame-acoustic resonance in laboratory non-premixed burners,which could contribute to the detection and prevention of potential thermoacoustic instabilities or resonance structure failures of industrial ***,this study demonstrates an alternative to conventional linear tool for the characterization of nonlinear acoustic resonance in industrial boilers.