Aerospace parts manufacturer Parker Aerospace began supplying oilfield gas turbines for Vericor Power System in 20193D printingFuel atomizing nozzle and dual fuel hydraulic manifold assembly. Recently, Parker’s fuel nozzle patent was passed. In this issue, we will have a deep perspective on Parker’s fuel nozzle’s additive thinking concept with netizens.
More uniform and stable
Turbine engines generally include a casing extending radially from the air diffuser and combustion chamber. The casing surrounds the burner and is used to contain the burning fuel. The combustor includes a liner and a combustor dome, and the igniter is mounted to the housing and extends radially inward into the combustor to ignite the fuel.
Turbines usually also include multiple fuel nozzles for directing fuel from the manifold to the combustor. The fuel injector also serves to prepare the fuel to mix with air before combustion. Fuel nozzles are usually placed in an evenly spaced annular arrangement to evenly distribute (spray) fuel into the combustion chamber.
Unique design combining inside and outside
The fuel swirler of the fuel nozzle in the gas turbine engine developed by Parker includes: a fuel swirler body having an upstream part and a downstream part, and an inlet part at the upstream part of the fuel swirler body is provided for fluid communication with a fuel source Fuel manifold. The outlet part at the downstream part of the fuel cyclone main body has a plurality of fuel flow passages extending from the fuel manifold to the outlet part.
The fuel nozzle developed by Parker has a specific application in the aircraft’s gas turbine engine, with a unique fuel swirler and a unique external air swirler design.
The appearance of the fuel nozzle © Parker Hannifin Patent
The fuel swirl appliance developed by Parker has multiple advantages, including uniform spray, which can provide higher mixture uniformity, more efficient combustion, and improved flame stability, while minimizing the recirculation area along the fuel flow path. , And reduce the possibility of fuel-rich areas that may cause hot spots, reduce the residence time of fuel entering the cyclone, reduce coking inside the nozzle, and reduce thermal stress.
Cross-sectional view of fuel nozzle © Parker Hannifin Patent
pass through3D printing-Additive manufacturing technology can make the external air cyclone into a seamless and integrated overall structure. The external air cyclone device designed by Parker has multiple advantages, including improved atomization and spray uniformity with a wider spray angle , Increase the effective area of the air inlet to minimize flow interruption and enhance flow performance.
Parker has improved the fuel flow path in the nozzle through additive manufacturing technology. The improved fuel flow path can achieve better fuel film formation and atomization performance, thereby optimizing the fuel distribution in the engine combustion chamber, thereby improving combustion performance.
In addition to other improvements, the cross-sectional area of the fuel flow path inside Parker’s new additive manufacturing nozzle is designed to decrease along the flow direction, which increases the fuel flow speed, reduces fuel residence time, and reduces flow path coking and blockage. tendency.
Parker’s improved aerodynamic performance and spray performance are mainly achieved by improving the geometry of the swirler blades, which have been proven3D printing-Additively manufactured with excellent spray performance.
From the structural point of view, according to the understanding of 3D Science Valley, the air swirler of the fuel nozzle of the gas turbine engine developed by Parker includes: radial outer cover, radial inner cover, and swirler blades, swirler blades and outer wall And the inner wall has multiple air passages. The upstream edge of the radial outer cover flares radially outward with respect to the downstream part of the outer cover to increase the effective area of the air inlet.
Accelerate the industrialization of additive manufacturing
Parker Aviation provides parts and maintenance services to aircraft manufacturers. In the past few years, customers served include Airbus, Rolls-Royce and COMAC. Parker Aviation has made a series of3D printingParts such as fuel components and high temperature exhaust valves.
Parker Aerospace uses powder bed electron beam to melt metal3D printingThe technology to manufacture these parts eliminates the limitations of traditional manufacturing technology and produces higher-performance parts with a significant reduction in the number of parts. For the fuel nozzles provided by Parker for TF50F gas turbines, compared with traditional nozzles,3D printingThe TF50F fuel nozzle has reduced the number of parts by 30%.
Parker’s development of additive manufacturing fuel nozzles in aerospace applications is mature enough to not only put additive manufacturing nozzles into production, Parker Aerospace has been recognized by OEM customers. This achievement is an important milestone for Parker in The application of additive manufacturing in the aerospace field has laid the foundation.
Parker’s long-term goal of additive manufacturing is to expand its list of additive manufacturing products for aerospace components, including valves, housings, fuel mixers, and more. Additive manufacturing products will meet FAA certification standards and AS quality requirements. Eventually, it will meet ISO, SAE, ANSI and other standards.
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