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- W2064293778 abstract "An “equivalence ratio oscillation” was studied that produced a strong low frequency combustion instability (at 80 and 160 Hz) when a commercial lean premixed prevaporized (LPP) fuel injector was operated using Jet-A fuel at realistic conditions. The elevated pressures, temperatures, air flow rates and overall equivalence ratios were close to conditions at engine idle. However the fraction of fuel diverted to the various injector ports was sufficiently off-design to create an instability. High speed movies showed that the flame base violently moves upstream and downstream at 80 Hz, and that flashback plays a role in the rapid upstream movements. Flame shape also changes at 80 Hz from a flat flame to a more elongated flame, which affects the heat release pattern and causes oscillations in the air flow rate. A regime diagram is reported which contains the boundary that marks the onset of the instability. Other higher frequency instabilities were also present and were due to longitudinal and azimuthal organ tones, but their magnitudes were more than ten times smaller than the pressure fluctuations caused by the equivalence ratio oscillation." @default.
- W2064293778 created "2016-06-24" @default.
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- W2064293778 date "2012-01-09" @default.
- W2064293778 modified "2023-09-23" @default.
- W2064293778 title "Low Frequency Combustion Instabilities Imaged in a Gas Turbine Combustor Flame Tube" @default.
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- W2064293778 doi "https://doi.org/10.2514/6.2012-542" @default.
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