The present article investigates the interactions between the pilot and main flames in a novel
stratified swirl burner using both experimental and numerical methods. Experiments are …

Highlights•The stratified flames are established at different swirl intensities, air split ratios
and stratification ratios.•Three parameter's separate and combined effects on flame structure …

Stratified swirling flames are typically formed in centrally-staged combustors of modern aero
engines. The pilot flame plays an indispensable role in stabilizing the stratified swirling …

In a centrally-staged combustor, the stratified swirling flame often manifests a helical mode,
which is characterized by the emergence of helical vortices, including the precessing vortex …

Combustion instability has been widely reported in several combustion types; however,
there is limited information on different fuel/air mixing distances in non-premixed …