| Citation: | XIAO Wei. Lean blowout model for concentric staged low emission combustor[J]. Journal of Aerospace Power, 2023, 38（5）：1038-1046 doi: 10.13224/j.cnki.jasp.20220491
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With an aim to develop a prediction model and obtain the key factors influencing the lean blowout limits in concentric staged combustors, experimental and theoretical investigations were conducted based on the flame blowout process inside a gas turbine combustor. The influences on the lean blowout limits of combustor geometry, atomization and conditions were investigated, and a method to optimize the flame stability performance was also proposed. An improved prediction model of the lean blowout limits was developed and validated. It was found that the co-swirl led to the larger recirculation zone, lower recirculated velocity and longer resistance time compared with counter-swirl, resulting in weak turbulent exchange between pilot and main flame. Consequently, the lean blowout performance of co-swirl flame was better than the counter-swirl flame. The maximum error of 20% was validated by comparing the annular and single dome combustor experimental data with the lean blowout model, which can be used in the stage of primary design of combustors.
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