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Numerical investigation of ethylene flame bubble instability induced by shock waves

Content Provider	Springer Nature Link
Author	Dong, Gang Ye, Jingfang Fan, Baochun
Copyright Year	2008
Abstract	In this paper, the ethylene/oxygen/nitrogen premixed flame instabilities induced by incident and reflected shock wave were investigated numerically. The effects of grid resolutions and chemical mechanisms on the flame bubble deformation process are evaluated. In the computational frame, the 2D multi-component Navier–Stokes equations with second-order flux-difference splitting scheme were used; the stiff chemical source term was integrated using an implicit ordinary differential equations (ODEs) solver. The two ethylene/oxygen/nitrogen chemical mechanisms, namely 3-step reduced mechanism and 35-step elementary skeletal mechanism, were used to examine the reliability of chemistry. On the other hand, the different grid sizes, Δx × Δy = 0.25 × 0.5mm and Δx × Δy = 0.15 × 0.2mm, were implemented to examine the accuracy of the grid resolution. The computational results were qualitatively validated with experimental results of Thomas et al. (Combust Theory Model 5:573–594, 2001). Two chemical mechanisms and two grid resolutions used in present study can qualitatively reproduce the ethylene spherical flame instability process generated by an incident shock wave of Mach number 1.7. For the case of interaction between the flame and reflected shock waves, the 35-steps mechanism qualitatively predicts the physical process and is somewhat independent on the grid resolutions, while the 3-steps mechanism fails to reproduce the instability of ethylene flame for the two selected grid resolutions. It is concluded that the detailed chemical mechanism, which includes the chain elementary reactions of fuel combustion, describes the flame instability induced by shock wave, in spite of the fact that the flame thickness (reaction zone) is represented by 1–2 grids only.
Ending Page	419
Page Count	11
Starting Page	409
File Format	PDF
ISSN	09381287
e-ISSN	14322153
Journal	Shock Waves
Issue Number	6
Volume Number	17
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-03-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Shock waves Chemical mechanism Thermodynamics Fluids Ethylene flame Engineering Thermodynamics, Transport Phenomena Condensed Matter Engineering Fluid Dynamics Acoustics Grid resolution
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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