Influence of Single-Component Fuels on Gas-Turbine Model Combustor Lean Blowout

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Influence of Single-Component Fuels on Gas-Turbine Model Combustor Lean Blowout

Grohmann, J. / Rauch, B. / Kathrotia, T. / Meier, W. / Aigner, M.

The influence of selected single-component hydrocarbons on lean blowout behavior of swirl-stabilized spray flames was investigated. Additional information on the spray characteristics was collected by phase Doppler interferometry and Mie scattering measurements. The measurements were accomplished in a gas-turbine model combustor under atmospheric pressure and at two different air preheat temperatures. The combustor featured a dual-swirl geometry and a prefilming airblast atomizer. The combustion chamber provided good optical access and yielded well-defined boundary conditions. Three single-component hydrocarbons were chosen: one short and one long linear alkane ( $n$ -hexane and $n$ -dodecane) as well as one branched alkane (iso-octane). Kerosene Jet A-1 was used as a reference. Results show noticeable differences in the lean blowout limits of the various fuels, at comparable flow conditions. By using the results of the measurements, of additional modeling, and of an assessment of the fuel properties, it was concluded that fuel differences in lean blowout in this combustor can be due to differences in the physical properties as well as in the chemical properties.