Impact of injector characteristics on combustion instabilities in a swirl-spray combustor
Résumé
The influence of the injection system on combustion instabilities is investigated in this work by making use of systematic experiments with three swirlers having similar geometries, but different pressure losses and swirl numbers. The swirling injectors are tested in a laboratory-scale swirl-stabilized combustor called SICCA-spray that represents one segment of the MICCA-spray annular combustor. Measurements are performed with liquid heptane fuel, delivered as a hollow cone spray by a pressure atomizer. Self-sustained oscillations are examined for the different swirlers by varying the chamber length. Test results show differences in oscillation frequency and oscillation amplitude between the different swirlers. Acoustic damping estimated for each swirler under cold flow conditions reveal their distinct behavior. This, however, is not enough to explain the differences observed in the unstable behavior of the various systems. .
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INCA2021_Impact of injector characteristics on combustion instabilities in a swirl spray combustor.pdf (1.63 Mo)
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