Flame Symptom Modelling Near Lean Blowout in a Swirl-Stabilized Gas Turbine Model Combustor

摘要

Lean premixed combustion offers a practical approach for the reduction of NO_x emissions, but increases the risk of lean burn blow out (LBO) in gas turbines. Flame behavior in terms of stability is simulated in a model gas turbine combustor burning aviation kerosene at atmospheric pressure. The flame symptom close to LBO, where the flame propagates in the broken-reaction zone (BRZ) regime in double swirl combustor is studied when the main influence parameter of first to second stage air flow ratio is 1:5. Adjusting the dimensionless ratio of oil/air equivalence to 0.35 is identified as significant perturbation source for inducing unstable combustion. Results of simulation show a good agreement with obtained data of other test.