Numerical Simulation Study on the Dynamics of Bluff-Body Flames under Oxygen-Lean Conditions

Fuquan Deng, Minwei Zhao, Shunchuang Qin, Zhaokun Wang, Yongliang Xie, Hongtao Zheng, Xiao Liu () and Feng Zhang ()
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Fuquan Deng: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Minwei Zhao: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Shunchuang Qin: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Zhaokun Wang: Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR 999077, China
Yongliang Xie: School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Hongtao Zheng: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Xiao Liu: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Feng Zhang: College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China

Energies, 2023, vol. 17, issue 1, 1-19

Abstract: As modern aeroengine combustors advance towards high temperatures, afterburners are inevitably affected by diminished oxygen content in incoming flows, thus affecting combustion efficiency, instability, and flammability limits. In this study, the dynamic combustion characteristics of V-shaped bluff body-stabilised diffusion flames were investigated using a large eddy simulation method with an oxygen mass fraction range of 14–23% and temperatures ranging from 900 to 1100 K. The results show the significant effects of oxygen content and inflow temperature on the flame/flow behaviours downstream of the bluff-body flame holder. In a separated shear layer, two distinct modes of flow/flame shedding are observed when varying the oxygen content and inflow temperature. The results show that BVK instability governs the far-field wake flow/flame features, whereas the oxygen concentration and temperature significantly affect their oscillation amplitudes. In addition, variations in the incoming oxygen content and temperature shift the axial position of the transition from KH instability to BVK instability. Finally, a spectral analysis is conducted to investigate the characteristics of pressure and heat release pulsations under different scenarios. This study highlights the importance of oxygen content on the combustion dynamics of bluff body-stabilised diffusion flames at various temperatures, which is essential for optimising combustion efficiency and stability in practical applications.

Keywords: oxygen content; bluff-body diffusion flame; vortex shedding; dynamic combustion characteristic; large eddy simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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