Swirl-stabilized non-premixed propane/air flames in a gas turbine model combustor

Abstract eng:
Turbulent non-premixed swirl-stabilized flames were investigated in a gas turbine model combustor. Velocity and soot concentration fields for propane/air combustion at three overall fuel-air equivalence ratios were studied. Stereoscopic particle image velocimetry was used to acquire the three-dimensional velocity data in the combustor. The time-averaged soot volume fractions were obtained using the technique of laser induced incandescence. The flow field and soot measurements were conducted separately, but under identical experimental conditions. The velocity measurements depicted the inner and outer recirculation zones, the boundaries of which showed high turbulence intensity. The soot volume fractions showed a strong dependence on the overall fuel-air equivalence ratio. The combustor axis showed the peak time-averaged soot concentration at nearly all axial heights.

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