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Image of Vibration Testing and System Dynamics
ISSN: 2475-4811 (print)
ISSN: 2475-482X (online)
Journal of Vibration Testing and System Dynamics

C. Steve Suh (editor), Pawel Olejnik (editor),

Xianguo Tuo (editor)

Pawel Olejnik (editor)

Lodz University of Technology, Poland

Email: pawel.olejnik@p.lodz.pl

C. Steve Suh (editor)

Texas A&M University, USA

Email: ssuh@tamu.edu

Xiangguo Tuo (editor)

Sichuan University of Science and Engineering, China

Email: tuoxianguo@suse.edu.cn

Analysis of Mass Transport in a Turbulent Flame Using Lagrangian Coherent Structures

Journal of Vcibration Testing and System Dynamics 4(1) (2020) 79--93 | DOI:10.5890/JVTSD.2020.03.005

Shengli Cao$^{1}$,$^{2}$, Jiazhong Zhang$^{1}$, Yoshihiro Deguchi$^{2}$, Nannan Dang$^{1}$,$^{2}$, Shaohua Tian$^{1}$

$^{1}$ School of Power and Energy Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China

$^{2}$ Advanced Technology and Science, Tokushima University, Tokushima 770-8501, Japan

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Abstract

The premixed piloted turbulent flame is studied numerically using Lagrangian coherent structures (LCS) to study and analyze the masstransport process from the viewpoint of nonlinear dynamic systems. The mass transport is shown to demonstrate a rich dynamical behavior. Firstly, the numerical simulation results show that the boundaries in the combustion field are delineated by the Lagrangian Coherent Structures. Secondly, the distribution of the attracting LCSs and the OH radical are compared to study the surface of the flame. Finally, the evolution of the LCS was tracked to analyze the vortexes and mass transport near the burner. The results show that the attracting LCS can be considered as a surface of the turbulent flame near the burner. The serial vortexes are regularly generated near the piloted jet, and they are gradually stretched and folded. These vortexes are attracted by the main jet as they move downward in the flow. The main jet goes into the flow field following an attracting LCS and moves forward attracting the piloted jet and the co-flow. However, fluid in the mainstream region has never entered into the piloted jet region, and this region does not exchange substance with the co-flow region. If the flow speed increases, air from the co-flow may pass through the LCS to mix with the material from the piloted jet region. Application of the LCS technique to study mass transport processes provides a new viewpoint for analyzing premixed piloted turbulent flames.

Acknowledgments

The research is supported by the Key Research and Development Program of Shaanxi Province (No.2017ZDCXL-GY-02-02), the Key Laboratory of Compressor of China (No. SKL-YSJ201802) and the World-Class Universities(Disciplines) and the Characteristic Development Guidance Funds for the Central Universities ( No. PY3A056).

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