Prefilming air blast (PAB) pilot for low emissions combustors

• Main Authors: RAMESHKUMAR MUTHUVEL CHANDRASEKARAN, ALFRED ALBERT MANCINI, MICHAEL ANTHONY BENJAMIN
• Format: Patent
• Language: Chinese; English
• Published: 21.12.2016
• Subjects: BLASTING; BURNERS; COMBUSTION APPARATUS; COMBUSTION PROCESSES; GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGHVELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS; HEATING; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

A pilot fuel injector is provided for a fuel nozzle of a gas turbine engine. The pilot fuel injector can include an axially-elongated, inner pilot centerbody wall extending from an upstream end to a downstream end, wherein the axially-elongated, inner pilot centerbody wall has a diverging-converging orientation with respect to a centerline axis to define a hollow tube having an upstream diameter, a throat, and a downstream diameter such that the throat has an inner diameter that is less than inner diameters of the upstream diameter and the downstream diameter. The pilot fuel injector also includes a center air circuit positioned at the upstream end, and an annular fuel passage defining the downstream end and intersecting with the centerbody wall at a pilot fuel metering orifice. A pilot fuel film surface is downstream from the annular fuel passage. 种引导燃料喷射器提供成用于燃气涡轮发动机的燃料喷嘴。引导燃料喷射器可包括从上游端延伸至下游端的沿轴向长形的内引导中心体壁，其中沿轴向长形的内引导中心体壁相对于中心线轴线具有发散-会聚定向，以限定具有上游直径、喉部和下游直径的中空管，使得喉部具有小于上游直径和下游直径两者的内径。引导燃料喷射器还包括定位在上游端处的中心空气回路