https://orcid.org/0000-0001-7341-6099
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Abstract
Laminar flame speed (LFS) is one of the most important physicochemical properties of a combustible mixture. At normal and elevated temperatures and pressures, LFS can be measured using propagating spherical flames in a closed chamber. LFS is also used in certain turbulent premixed flame modelling for combustion in spark ignition engines. Inside the closed chamber or engine, transient pressure rise occurs during the premixed flame propagation. The effects of pressure rise rate (PRR) on LFS are examined numerically in this study. One-dimensional simulations are conducted for spherical flame propagation in a closed chamber. Detailed chemistry and transport are considered. Different values of PRR at the same temperature and pressure are achieved through changing the spherical chamber size. It is found that the effect of PRR on LFS is negligible under the normal and engine-relevant conditions considered in this study. This observation is then explained through the comparison between the unsteady and convection terms in the energy equation for a premixed flame.
Acknowledgements
This work was supported by National Natural Science Foundation of China (Nos. 91741126 and 51861135309). Z.C. thanks Mr. Ziyu Wang at Northeastern University for helpful discussion on laminar flame speeds measured from constant-volume propagating spherical flames. Z.C. also thanks Prof. Paul Clavin at Aix-Marseille Université for helpful discussion on the results shown in Section 6.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Supplemental data
Supplemental data for this article can be accessed at https://doi.org/10.1080/13647830.2020.1780325.