| Autor: |
Scoletta, Edoardo, Polifke, Wolfgang |
| Předmět: |
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| Zdroj: |
INTER-NOISE & NOISE-CON Congress & Conference Proceedings; 2023, Vol. 265 Issue 1, p1-9, 9p |
| Abstrakt: |
Flame transfer functions (FTF) of laminar premixed flames are analytically investigated and modelled. The study is based on the linearised G-equation, which is used to kinematically track the flame front. In order to incorporate combustion properties, the laminar consumption speed is considered to vary with the flame front stretch. Written in dimensionless form, the G-equation reveals that the FTF depends on three dimensionless parameters: a Strouhal number (St*) that accounts for the convective time of the flow perturbation along the flame-front, the flame aspect-ratio (Λ) and the dimensionless Markstein length (Ma), adimensionalized by the injector radius. It is shown that the latter term is responsible for an additional mechanism that acts as damper or amplifier of the flame perturbation, respectively, for thermodiffusively stable or unstable flames. A LOM FTF is derived both for Conical and V-flames which accounts for this effect and includes a different scaling term for each configuration. The obtained FTFs are compared to previously proposed analytical models from the literature, discussing the conditions where stretch effects are not negligible. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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