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A variable pitch fan is similar in concept to that of a variable-pitch propeller and involves progressively reducing the pitch (or blade angle) of the fan on a turbofan as the engine is throttled. Although variable pitch fans are used in some industrial applications, the focus of this article is on their use in turbofan engines.
The Turbomeca Astafan is a single-spool, variable-pitch turbofan engine developed from the Turbomeca Astazou. [1]: 553 [2]: 932 Despite successful flight-testing, an efficient, quiet and clean design (compared to turbojets and conventional turbofans) [1]: 554–555 [3]: 1648 [4]: 1872 and some commercial interest, [5]: 1683 the Astafan never entered series production.
The UltraFan is a geared turbofan with a variable pitch fan system that promises at least 25% efficiency improvement. [84] The UltraFan aims for a 15:1 bypass ratio and 70:1 overall pressure ratio. [85] The Ultrafan keeps the Advance core, but also contains a geared turbofan architecture with variable-pitch fan blades.
The M45SD-02 variable geometry fan engine at the New Mills Technology Centre. M45F Civil low bypass turbofan 7,915 lbf (35.21 kN) for take-off. [5] M45G Military low bypass turbofan 13,200 lbf (58.72 kN) for take-off, wet. [5] M45H Civil medium bypass turbofan 7,880 lbf (35.05 kN) for take-off, wet. [5] RB.410
A turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion.The word "turbofan" is a combination of references to the preceding generation engine technology of the turbojet and the additional fan stage.
Team JEGS also sets up mobile cancer screening centers at NHRA weekend events to keep the topic front & center with thousands of drag racing fans. [ citation needed ] The foundation's distinctive logo is a ribbon featuring the black & white motif of racing's checkered flag filled in with various cancer awareness colors.
The ideal fan operating line on an augmented turbofan sets fan pressure ratio as high as possible to optimize fan performance and thrust while keeping adequate fan stall margin. The fan operating line is controlled by varying the nozzle area which acts like a throttling valve.
Medium-bypass turbofan engines (17 P) T. ... Variable pitch fan This page was last edited on 23 March 2013, at 07:00 (UTC). Text is available under the Creative ...