Method of disgorging flames from a two stream tangential entry nozzle

A method for burning fuel in the combustor of a gas turbine engine with a premixing type of combustion, comprising

• providing scroll swirler having first and second endplates, said first endplate in spaced relation to said second endplate defining a substantially cylindrical mixing zone therebetween, said second endplate having a combustor inlet port extending therethrough;
• providing a centerbody located within said mixing zone and having a radially outer surface that tapers toward the combustor inlet and extends substantially the entire length of the mixing zone;
• introducing a first portion of combustion air tangentially into said mixing zone substantially continuously along the length thereof;
• introducing a first portion of fuel into said combustion air as said combustion air is introduced into said mixing zone;
• mixing said combustion air and fuel by swirling said combustion air and fuel about said centerbody while flowing said combustion air and fuel towards said combustor inlet;
• flowing said first portion of combustion air into said combustor inlet;
• introducing a second portion of combustion air into said centerbody;
• introducing a second portion of fuel into said second portion of combustion air within said centerbody;
• mixing said second portion of fuel with said second portion of combustion air within said centerbody;
• introducing said second portion of combustion air into said first portion radially inward thereof at said combustor inlet;
• and,
• burning said fuel external of said mixing zone.