燃烧和反应

Experimental Investigation of Flame Dynamics Based on High-Speed Images in Swirl Combustion Systems

  • LI Yao ,
  • HU Chunyan ,
  • ZHAO Qianpeng ,
  • YANG Jinhu ,
  • TAN Xiangmin ,
  • XU Gang
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  • 1. Key Laboratory of Light Duty Gas Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Innovation Academy for Light-Duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China

网络出版日期: 2023-11-28

基金资助

This work received funding from Youth Program of National Natural Science Foundation of China (Grant No. 51806219) and National Science and Technology Major Project (2017-V-0010).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Experimental Investigation of Flame Dynamics Based on High-Speed Images in Swirl Combustion Systems

  • LI Yao ,
  • HU Chunyan ,
  • ZHAO Qianpeng ,
  • YANG Jinhu ,
  • TAN Xiangmin ,
  • XU Gang
Expand
  • 1. Key Laboratory of Light Duty Gas Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Innovation Academy for Light-Duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China

Online published: 2023-11-28

Supported by

This work received funding from Youth Program of National Natural Science Foundation of China (Grant No. 51806219) and National Science and Technology Major Project (2017-V-0010).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

旋流分层火焰间相互作用机制复杂,值班火焰对燃烧稳定性有明显的影响,为了研究这一特性,仅供应值班级燃料,在模型燃烧室上开展了系列实验研究。试验中,使用带CH*滤波器的高速摄像机捕捉值班火焰CH*化学发光动态图像,运用数字图像分析和本征正交分解(POD)等方法获得了火焰的总体结构及主要脉动模态的分布特征。随着值班级当量比的增加,值班火焰逐渐表现出不稳定状态,其POD能量分布也表现出明显的不同。在不稳定时,旋流火焰主要包括螺旋运动、火焰脱离和轴向振荡等三种模态,并结合实验特性进一步分析了其形成原因;前四种POD模态时间系数傅立叶变换(FFT)分析显示其所有主频率均为280 Hz,这表明,此时燃烧器处于共振状态;此外,基于不同分辨率的图像敏感性分析进一步揭示了POD方法的鲁棒性及其快速算法的优化方向。这些分析结果阐述了值班燃料流量对火焰稳定性有重要的影响,可被用于指导下一步的研究。

本文引用格式

LI Yao , HU Chunyan , ZHAO Qianpeng , YANG Jinhu , TAN Xiangmin , XU Gang . Experimental Investigation of Flame Dynamics Based on High-Speed Images in Swirl Combustion Systems[J]. 热科学学报, 2023 , 32(1) : 427 -437 . DOI: 10.1007/s11630-022-1728-0

Abstract

The interaction mechanism of internally-staged-swirling stratified flame is complex, and the pilot flame has a manifest influence on flame stability. To study this, a series of experimental investigations for the pilot flame has been carried out in a model swirl combustor by only supplying the pilot fuel. The CH* chemiluminescence images of the pilot flame are acquired by a high-speed camera with a CH* bandpass filter, whose dynamic characteristics are identified by image statistical analysis and proper orthogonal decomposition (POD) analysis. And the fast algorithm based on matrix theory proposed in this paper increases the operation efficiency and operability of POD. With the pilot equivalence ratio Φ increase, the pilot flame gradually shows an unstable state, whose POD energy distribution is significantly different. In the unstable state, the flame dynamics include three modes—spiral motion mode, flame shedding mode, and axial oscillation mode, whose formation reasons have also been further analyzed in combination with the experimental characteristics. And the fast Fourier transform (FFT) analysis of the time coefficients for the first four POD modes indicates all the dominant frequency is 280 Hz, which means the model combustor is in resonance. In addition, a sensitivity analysis based on the different image resolutions further reveals the robustness of the POD method and its optimization direction. These results emphasize the important influence of the pilot fuel flow rate on the stability of the pilot flame.

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