Response of a Transcritical Coaxial Flame to Fuel Injection Rate Modulations: Analysis and Low-Order Modeling of the Generation of Unsteady Heat Release Rate - Archive ouverte HAL
Communication Dans Un Congrès Année : 2017

Response of a Transcritical Coaxial Flame to Fuel Injection Rate Modulations: Analysis and Low-Order Modeling of the Generation of Unsteady Heat Release Rate

Résumé

Acoustic pressure fluctuations within the combustion chamber or the plenums of a liquid-rocket engine can induce temporal modulations of the propellants injection velocities. The dynamic response of a tran-scritical coaxial flame to such velocity modulations is here investigated as it is thought to be one of the mechanisms that can promote high-frequency combustion instabilities. A low-order model for this process is proposed, assuming that the modulation induces fluctuating flame stretch rates traveling along the flame front. This question is then addressed through Large-Eddy Simulation (LES). The annular fuel stream of a single element LOx/GCH 4 injector is acoustically modulated at several frequencies. The proposed model is in reasonable agreement with the flame response extracted from the LES in terms of both gain and phase.
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Dates et versions

hal-01649825 , version 1 (27-11-2017)

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Robin Nez, Thomas Schmitt, Manuel Gonzalez-Flesca, Sebastien Candel, Sébastien Ducruix. Response of a Transcritical Coaxial Flame to Fuel Injection Rate Modulations: Analysis and Low-Order Modeling of the Generation of Unsteady Heat Release Rate. 7TH EUROPEAN CONFERENCE FOR AERONAUTICS AND AEROSPACE SCIENCES (EUCASS), Jul 2017, Milan, Italy. ⟨10.13009/EUCASS2017-369⟩. ⟨hal-01649825⟩
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