Stabilization regimes and pollutant emissions from a dual fuel CH4/H2 and dual swirl low NOx burner

Burning hydrogen in gas turbines is a relevant technological solution to decarbonize power production and propulsion systems. However, ensuring low NOx emission preventing flashback can be challenging with hydrogen. Stabilization regimes pollutant emissions from partially premixed CH4/H2/air flames above coaxial Dual Fuel Swirl injector are investigated laboratory-scale combustor at atmospheric conditions for increasing contents. The consists of an external annular swirler providing methane/air central channel fed pure This burner virtually removes the risk due late injection Flame stabilization regimes, CO analyzed different configurations operating points. effect swirling stream together influence recess, i.e. its nozzle position respect backplane combustion chamber. It shown that favors aerodynamically stabilized resulting thermal stress on limited emissions. study also highlights small recess widely extends operability range flames. With sufficient inner swirl detach rim when bulk velocity large enough. In this configuration, it found remain even operation Moreover, decrease fixed equivalence ratio.