Numerical Investigation of a Coupled Blow-Off/Flashback Process in a High-Pressure Lean-Burn Combustor
نویسندگان
چکیده
Abstract Large eddy simulation is used to investigate the flashback mechanism caused by combustion-induced vortex breakdown (CIVB) in a high-pressure lean-burn annular combustor with lean direct injection of kerosene. A single sector geometry, including central pilot flame surrounded main flame, simulated at takeoff conditions. previously developed flamelet-based approach model turbulence–combustion interactions due its relatively low cost, allowing simulate sufficiently long time window. In stable operations, stabilizes an M-shape configuration and periodic movement jet, corresponding formation small recirculation bubble, observed. Flashback then observed, accelerating upstream toward injector as already described other studies. This large (LES), however, reveals precursor partial blow-out induced cluster vortices appearing outer region. The combined effect sudden quenching alters mixing level close injector, causing first main, accelerate upstream, initiate CIVB cycle before quenched region can re-ignite. Main flames partly extinguish they cross their respective fuel point, re-ignition follows remnants reaction stream. process investigated detail, discussing causes CIVB-driven realistic systems.
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ژورنال
عنوان ژورنال: Journal of engineering for gas turbines and power
سال: 2022
ISSN: ['0742-4795', '1528-8919']
DOI: https://doi.org/10.1115/1.4055483