Le 27/09/2017

Thierry Schuller, Clément Mirat, Jérôme Beaumier, Daniel Durox, Sébastien Candel

Self-sustained instabilities of spray flames coupled by azimuthal modes will be first analysed in the annular MICCASpray chamber at EM2C as a function of the flow operating conditions by recording the chemiluminescence and acoustic pressure signals in the plenum and chamber associated to the different injectors. These data will be completed by images of the flame dynamics with a high-speed camera at the different injector locations. The flame response to longitudinal flow disturbances will be determined in the single burner setup with a single injector of the annular chamber. Boundary and flow characterizations will be made to provide the data needed by CERFACS to simulate these acoustic responses. The resulting FDF (Fig. 1d) determined by only considering longitudinal forcing will be used to examine the linear and nonlinear stability of the annular combustor and compare predictions from low-order models originally developed for gaseous fuels with measurements gathered at limit cycles in the annular chamber operated with liquid fuels. These comparisons will allow determining the validity of this approach and identifying conditions where multiple flame interactions and transverse response of flames determined in the TACC-Spray chamber need to be considered. Interactions with CORIA in analysing the combined response of these flames to longitudinal and transverse forcing will then provide elements to guide new models including effects of injector separation and transverse forcing.

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Figure 1 : MICCA setup : (a) with swirling injectors, (b) operating with gaseous fuel and a metallic inner cylindrical wall. (c) Setup used for FDF determination. (d) Example of FDF from a liquid fuel injector.

In all of the above approaches, the key element relies on a FTF or FDF for stability and limit-cycle predictions. To model FTF or FDF, state-of-the-art today points to Large Eddy Simulations (LES) of acoustically isolated burners forced with acoustic waves at the frequencies of interest, the combustion response to these solicitations being measured directly from the unsteady simulations. This method has proved successful in capturing fundamental properties of the FTF/FDF for gaseous and swirled flames. Extension and systematic validation to swirling flames fed by liquid fuel are however missing underlining the importance of the present work proposal.

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