Method and computer-readable model for additively manufacturing ducting arrangement with injector assemblies forming a shielding flow of air

A method for manufacturing a ducting arrangement, the method comprising:

• generating a computer-readable three-dimensional (3D) model of the ducting arrangement, the model defining a digital representation comprising:
• a combustor wall in a combustion stage of a combustion turbine engine, the combustion stage to be fluidly coupled to receive a cross-flow of combustion products;
• and
• an injector assembly disposed in the combustor wall, the injector assembly comprising a reactant-guiding structure arranged to convey a flow of reactants to admix with the cross-flow of combustion products, wherein the injector assembly includes a passageway having an inlet side and outlet side, the passageway configured to inject a flow of a cooling fluid arranged for conditioning interaction of the flow of reactants with the cross-flow of combustion products, the interaction conditioning based on a boundary formed by the flow of cooling fluid that surrounds the flow of reactants and is effective to provide an ignition delay to the flow of reactants injected into the combustion stage,
• wherein the outlet side of the passageway defined by the model comprises geometric features configured to promote co-flow intermixing of the flow of cooling fluid with the flow of reactants, as each flow is respectively admitted into the combustion stage;
• and
• manufacturing the ducting arrangement using an additive manufacturing technique in accordance with the generated three-dimensional model.

A computer-readable three-dimensional model of a ducting arrangement for a combustion stage downstream of a main combustion stage of a gas turbine engine, wherein the model of the ducting arrangement is processable in a processor configured to control an additive manufacturing technique used to make ducting arrangements, the ducting arrangement comprising:

• a combustor wall in the combustion stage in the combustion turbine engine, the combustion stage to be fluidly coupled to receive the cross-flow of combustion products;
• and
• an injector assembly comprising:
• a reactant-guiding structure arranged to convey a flow of reactants to admix with the cross-flow of combustion products,
• wherein the injector assembly includes a passageway having an inlet side and outlet side, the passageway configured to inject a flow of a cooling fluid arranged for conditioning interaction of the flow of reactants with the cross-flow of combustion products, the interaction conditioning based on a boundary formed by the flow of cooling fluid that surrounds the flow of reactants and is effective to provide an ignition delay to the flow of reactants injected into the combustion stage,
• wherein the outlet side of the passageway defined by the model comprises geometric features configured to promote co-flow intermixing the flow of cooling fluid with the flow of reactants, as each flow is respectively admitted into the combustion.