# US 11,029,030 B2 · Ducting arrangement with injector assemblies configured to form a shielding flow of air injected into a combustion stage in a gas turbine engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,030 B2 - Document ID: US11029030B2 - Status: Granted - Kind: B2 - Application number: 16/316,470 - Filed: 2016-08-26 - Published: 2019-07-25 - Granted: 2021-06-08 - Earliest claimed: 2016-08-03 - Assignees: Siemens Energy Global GmbH & Co. KG - Applicants: Siemens Aktiengesellschaft - Inventors: Andrew J. North; Juan Enrique Portillo Bilbao; Walter Ray Laster; Timothy A. Fox - Web page: https://patentgrep.com/patent/US11029030B2 ## CPC - F23R 3/005: {Combined with pressure or heat exchangers} - F23R 3/286: {having fuel-air premixing devices (F23R3/30 takes precedence)} - F23R 3/002: {Wall structures (F23R3/02 and F23R3/007 take precedence)} - F23R 3/045: {using pipes} - F23R 3/34: Feeding into different combustion zones - F23R 3/346: {for staged combustion} - F23R 3/60: Support structures; Attaching or mounting means - F23R 2900/00018: Manufacturing combustion chamber liners or subparts - F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16) ## Abstract Injector assemblies (12) and ducting arrangement (20) including such injector assemblies are provided. The injector assembly may include a reactant-guiding structure (16) arranged to convey a flow of reactants (19) into the combustion stage and means for injecting (24, 25, 26) a flow of air (22) into the combustion stage. The flow of air injected into the combustion stage may be arranged to condition interaction of the flow of reactants injected into the combustion stage with a cross-flow of combustion products (21), as the flow of reactants is admitted into the combustion stage. ## Claims ### Claim 1 An injector assembly disposed in a combustion stage of a combustion turbine engine, the combustion stage fluidly coupled to receive a cross-flow of combustion products, the injector assembly comprising: a reactant-guiding structure comprising an inner wall and an outer wall, the reactant-guiding structure arranged to convey a flow of fuel/air mixture to admix with the cross-flow of combustion products; and a passageway defined between the inner wall and the outer wall, the passageway comprising an inlet side and an outlet side, the inner wall circumferentially wrapping around the outer wall at the inlet side, the passageway configured to inject a flow of air arranged to condition interaction of the flow of fuel/air mixture with the cross-flow of combustion products. ### Claim 2 (depends on 1) The injector assembly of claim 1, wherein the flow of air is arranged to form a boundary of air flow that surrounds the flow of fuel/air mixture, as the flow of fuel/air mixture is admitted in the combustion stage. ### Claim 3 (depends on 2) The injector assembly of claim 2, wherein the boundary of air flow that surrounds the flow of fuel/air mixture is effective to transitorily shield the flow of fuel/air mixture conveyed to the combustion stage from the cross-flow of combustion products, and thus provide an ignition delay to the flow of fuel/air mixture injected into the combustion stage. ### Claim 4 (depends on 1) The injector assembly of claim 1, wherein the injector assembly is one of a plurality of injector assemblies, wherein the plurality of injector assemblies are arranged circumferentially spaced apart from each other in a transition duct. ### Claim 5 (depends on 4) The injector assembly of claim 4, wherein at least some of the plurality of injector assemblies are disposed at different axial locations in the transition duct. ### Claim 6 (depends on 1) The injector assembly of claim 1, wherein the outlet side of the passageway comprises a uniform cross-sectional profile along a perimeter of the outlet side of the passageway. ### Claim 7 (depends on 1) The injector assembly of claim 1, wherein the outlet side of the passageway comprises a varying cross-sectional profile along a perimeter of the outlet side of the passageway so that a velocity and a volume of the flow of air have a desired variation along the perimeter of the outlet side of the passageway. ### Claim 8 (depends on 1) The injector assembly of claim 1, wherein the outlet side of the passageway comprises geometric features configured to promote co-flow intermixing of the flow of air with the flow of fuel/air mixture, as each flow is respectively admitted into the combustion stage. ### Claim 9 (depends on 1) The injector assembly of claim 1, wherein the passageway comprises a first helical rib for swirling the flow of air to be injected into the combustion stage. ### Claim 10 (depends on 1) The injector assembly of claim 1, wherein the reactant-guiding structure comprises a second helical rib for swirling the flow of fuel/air mixture to be injected into the combustion stage. ### Claim 11 (depends on 1) The injector assembly of claim 1, wherein the passageway comprises a first helical rib for swirling the flow of air along a first swirl direction, wherein the reactant-guiding structure comprises a second helical rib for swirling the flow of fuel/air mixture along a second swirl direction, wherein the first and the second swirl directions comprise opposite swirling directions relative to one another. ### Claim 12 (depends on 1) The injector assembly of claim 1, wherein the passageway comprises a first helical rib for swirling the flow of air along a first swirl direction, wherein the reactant-guiding structure comprises a second helical rib for swirling the flow of fuel/air mixture along a second swirl direction, wherein the first and the second swirl directions comprise equal swirling directions relative to one another. ### Claim 13 (depends on 1) The injector assembly of claim 1, further comprising orifices arranged on the inner wall. ### Claim 14 A ducting arrangement comprising: a combustor wall in a combustion stage of a combustion turbine engine, the combustion stage fluidly coupled to receive a cross-flow of combustion products; an injector assembly disposed in the combustor wall, the injector assembly comprising a reactant-guiding structure comprising an inner wall and an outer wall, the reactant-guiding structure arranged to convey a flow of fuel/air mixture to admix with the cross-flow of combustion products, wherein the injector assembly includes a passageway defined between the inner wall and the outer wall, the passageway comprising an inlet side and an outlet side, the inner wall circumferentially wrapping around the outer wall at the inlet side, the passageway configured to inject a flow of air arranged for conditioning interaction of the flow of fuel/air mixture with the cross-flow of combustion products, the interaction conditioning based on a boundary formed by the flow of air that surrounds the flow of fuel/air mixture and is effective to provide an ignition delay to the flow of fuel/air mixture injected into the combustion stage. ### Claim 15 (depends on 14) The ducting arrangement of claim 14, wherein the combustor wall comprises a multi-panel arrangement that includes a plurality of cooling air conduits in fluid communication with the passageway in the injector assembly to convey air that passes through the plurality of cooling air conduits to the passageway and form the flow of air to be injected. ### Claim 16 (depends on 14) The ducting arrangement of claim 14, wherein the combustor wall comprises a unitized structure that includes a plurality of cooling air conduits in fluid communication with the passageway in the injector assembly to convey air that passes through the plurality of cooling air conduits to the passageway and form the flow of air to be injected. ### Claim 17 (depends on 14) The ducting arrangement of claim 14, wherein the injection assembly comprises a unitized structure. ### Claim 18 (depends on 14) The ducting arrangement of claim 14, comprising a unitized structure.