Snecma Silvercrest
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The Snecma Silvercrest is a turbofan currently under development which will be manufactured by Snecma.
Announced at the 2006 NBAA convention[1]. The engine was originally designed as a 8,500- to 10,500-pound thrust turbofan[2] to power super mid-size to large cabin business jets or 40 to 60-seat regional jets with a MTOW between 45,000 and 60,000 lb[3]. Since original development the thrust range has been raised and is currently quoted as 9,500 to 12,000 pounds of thrust.
The engine architecture includes a solid wide-chord swept fan without booster, followed by a 4 axial stage + 1 centrifugal stage high pressure compressor. The overall pressure ratio is 27:1 with a core pressure ratio of "over 17". The high pressure compressor is driven by a single stage turbine, while the 40 inch fan is coupled to a 3-stage low pressure turbine[2].
The high pressure spool and combustor have been run in a core-demonstrator reaching the take-off speed of 20,300rpm[4]. A full engine demonstrator is due to run towards the end of 2008, while engine certification is pencilled in for the end of 2010 or early 2011[5] and should be available towards 2012[6]. As of january 2008, no aircraft manufacturer had selected this engine.
Turbomeca which is, like Snecma, a part of the SAFRAN Group will help to design the centrifugal compressor stage[5].
[edit] Specifications
General characteristics
- Type: axial and centrifugal flow, twin-shaft, bypass turbofan engine (Bypass ratio: approx. 4.5[5])
- Length: approx. 74 in[5]
- Diameter: Fan: approx. 40 in[5]
- Dry weight:
Components
- Compressor: Low pressure: 1 axial fan (no booster), High pressure: 4 axial stages + 1 centrifugal stage[5]
- Turbine: Low pressure: 3 axial stages, High pressure: 1 axial stage[5]
Performance
- Thrust: 9,500 to 12,000 lbf[3]
- Overall pressure ratio: approx. 27 [5]
- Power-to-weight ratio:
[edit] References
- ^ "SILVERCREST: a new name in propulsion for business aviation", SAFRAN, 2006-10-17. Retrieved on 2008-01-02.
- ^ a b {{http://www.ainonline.com/airshow-convention-news/singapore-air-show/single-publication-story/browse/0/article/snecma-develops-new-bizav-engine/?no_cache=1&tx_ttnews%5Bmode%5D=1|accessdate=2008-05-26}}
- ^ a b "Snecma Announces Silvercrest Core demonstrator First Parts Delivered", SAFRAN, 2007-05-22. Retrieved on 2008-01-02.
- ^ Thierry Dubois. "Snecma Silvercrest engine completes core tests". Retrieved on 2008-05-26.
- ^ a b c d e f g h Thierry Dubois. "Snecma Silvercrest core engine set for first run", AINonline.com, 2007-05-22. Retrieved on 2008-01-02.
- ^ "Silvercrest, an innovative new bizjet engine", 2007-06-20. Retrieved on 2008-01-12.
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