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Flame Structure of Methane and Kerosene Combustion with A Compact Concave Flame-Holder using the LES-pdf Method

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Abstract

Compact flame-holders for afterburners are an increasing requirement for modern aero engines. However, flame-holder design is non-trivial since high inlet temperatures, velocities, and elaborate structures induce complex turbulence, combustion, and spray coupling in modern afterburners. In this work, the LES-pdf and stochastic fields-Lagrangian particle spray methods are used to investigate methane and aviation kerosene combustion structures formed by new-type concave flame-holders. The flow pattern, combustion mode, and flame structure of gaseous and liquid fuel around a concave flame-holder are analyzed, discussed, and compared with experimental results. Results reveal that the flame stability of a concave flame-holder is better than that of the non-concave one. Furthermore, when using liquid fuel, the concave flame-holder forms a stable and compact flame. These results suggest concave flame-holders are a promising design for compact afterburners.

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Abbreviations

e ij :

strain tensor

G :

normalized filter function

n :

number of droplets contained within the finite volume cell (for source terms equation)

p :

static pressure

\(\overline{\dot{S}}_{\text{mass}}\) :

contribution of dispersed phase as sources of mass

\(\overline{\dot{S}}_{\text{mom},i}\) :

contribution of dispersed phase as sources of momentum in ith direction

S (p) :

source term arising from the pth droplet

u j :

gas phase velocity

\(\xi_{\alpha}^{n}(x,t)\) :

nth scalars of αth stochastic field

ρ g :

density of the gaseous phase

σ :

Prandtl number (for energy equation) or Schmidt number (for species equation)

ϕ α :

the αth scalar field

Ω :

integration domain

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Acknowledgments

National Science and Technology Major Project (2017-I-0004-0005) and National Natural Science Foundation of China (91741125).

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Authors and Affiliations

  1. School of Energy and Power Engineering, Beihang University, Beijing, Beijing, 100191, China

    Fang Wang, Yunfan Wang, Guanyi Wei, Denghuan Liu & Jie Jin

  2. Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK

    William P. Jones

Authors
  1. Fang Wang
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  2. Yunfan Wang
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  3. Guanyi Wei
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  4. Denghuan Liu
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Correspondence to Fang Wang.

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Wang, F., Wang, Y., Wei, G. et al. Flame Structure of Methane and Kerosene Combustion with A Compact Concave Flame-Holder using the LES-pdf Method. J. Therm. Sci. 33, 222–234 (2024). https://doi.org/10.1007/s11630-023-1898-4

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  • DOI: https://doi.org/10.1007/s11630-023-1898-4

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