The flashback limits of natural gas-hydrogen-air flames in a gas turbine test rig with premixed swirl-stabilized flames have been determined for various premixing temperatures and flow rates. In this regard, local flame quenching is highly affecting the combustion induced vortex breakdown in the swirl burner. Comparing a Lewis number modified chemical time scale and a flow time scale, it is possible to correlate the flashback limits with a dimensionless burner specific quenching constant Cquench*. For this purpose, approaches for the laminar burning velocity, the mass diffusion coefficient and the Lewis number for fuel mixtures are presented.
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The flashback limits of natural gas-hydrogen-air flames in a gas turbine test rig with premixed swirl-stabilized flames have been determined for various premixing temperatures and flow rates. In this regard, local flame quenching is highly affecting the combustion induced vortex breakdown in the swirl burner. Comparing a Lewis number modified chemical time scale and a flow time scale, it is possible to correlate the flashback limits with a dimensionless burner specific quenching constant Cquench...
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