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- Variable_cycle_engine abstract "A variable cycle engine (VCE) is an engine that is designed to operate efficiently under mixed flight conditions, such as subsonic, transonic and supersonic.The next generation of Supersonic transport (SST) may require some form of VCE. SST engines require a high Specific Thrust (net thrust/airflow) at supersonic cruise to keep the cross-sectional area of the powerplant to a minimum, so as to reduce aircraft drag. Unfortunately, this implies a high jet velocity not only at supersonic cruise, but at take-off, which makes the aircraft noisy. A high specific thrust engine has a high jet velocity by definition, as the following approximate equation for net thrust implies:where:intake mass flow ratefully expanded jet velocity (in the exhaust plume)aircraft flight velocityRearranging the above equation, specific thrust is given by:So for zero flight velocity, specific thrust is directly proportional to jet velocity.The Olympus 593 engines in Concorde had a high specific thrust in supersonic cruise and at dry take-off power. This alone would have made the engines noisy, but the problem was compounded by the need for a modest amount of afterburning (reheat) at take-off (and Transonic Acceleration). An SST VCE would have to increase the engine airflow substantially at take-off, to reduce the jet velocity at a given thrust (i.e. a lower specific thrust)".
- Variable_cycle_engine wikiPageID "5291341".
- Variable_cycle_engine wikiPageRevisionID "552614113".
- Variable_cycle_engine hasPhotoCollection Variable_cycle_engine.
- Variable_cycle_engine subject Category:Jet_engines.
- Variable_cycle_engine subject Category:Mechanics.
- Variable_cycle_engine comment "A variable cycle engine (VCE) is an engine that is designed to operate efficiently under mixed flight conditions, such as subsonic, transonic and supersonic.The next generation of Supersonic transport (SST) may require some form of VCE. SST engines require a high Specific Thrust (net thrust/airflow) at supersonic cruise to keep the cross-sectional area of the powerplant to a minimum, so as to reduce aircraft drag.".
- Variable_cycle_engine label "Variable cycle engine".
- Variable_cycle_engine label "محرك الدائرة المتغيرة".
- Variable_cycle_engine sameAs m.0dcxs5.
- Variable_cycle_engine sameAs Q11978287.
- Variable_cycle_engine sameAs Q11978287.
- Variable_cycle_engine wasDerivedFrom Variable_cycle_engine?oldid=552614113.
- Variable_cycle_engine isPrimaryTopicOf Variable_cycle_engine.