To prevent flame flashback in swirl-stabilized, lean premixed combustion, a nonswirling air jet is introduced on the central axis of the radial swirl generator. This axial injection of air alters the flowfield as required for flashback-resistant combustion of premixed hydrogen. This study evaluates the impact of axial injection on the isothermal flowfield in a water tunnel by particle image velocimetry. Atmospheric reacting tests with hydrogen for inlet temperatures up to 620 K and up to stoichiometric conditions show a substantial increase in flashback resistance for the burner setup with axial injection. To verify the increase in flashback resistance to not be achieved at the expense of increased NO x emissions, fuel–air mixing is evaluated in a water tunnel by planar laser-induced fluorescence of a fuel tracer. Even for high axial injection rates, the recorded unmixedness and NO x emissions are uncorrelated. This results in single-digit NO x emissions below adiabatic flame temperatures of 2000 K. Consequently, axial injection significantly extends the operational range of the combustor without increasing the NO x emissions.


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    Title :

    Flashback Resistance and Fuel–Air Mixing in Lean Premixed Hydrogen Combustion



    Published in:

    Publication date :

    2018-05-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English







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