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- W2329473012 abstract "The major challenges with the design of propulsion systems for High speed Civil Transports (HSCT) are complying with FAR and EPA environmental standards while powering an economically acceptable aircraft. These issues create a dilemma in engine design because low exhaust jet velocities are required to meet takeoff noise regulations while high exhaust jet velocities are required for economical supersonic cruise operation. Previous studies have shown that to meet FAR Stage 3 noise regulations, engines incorporating mechanical/thermal noise suppression concepts must be oversized by 50 to 80% relative to the size that will provide the maximum aircraft economics. In order to achieve the Stage 3 noise levels without oversizing the engine, the engine airflow must be increased by 120% during takeoff operation to reduce the average exhaust velocity to an acceptable level. This paper will examine a concept that brings in 74% additional airflow into the engine’s inlet and 46% into the engine’s exhaust nozzle. The impacts of this concept on engine design, performance, size and weight and on aircraft takeoff gross weight (TOGW) and range are evaluated. For the same TOGW aircraft, this noise reduction concept provides a 70% range improvement relative to engines which incorporate mechanical/thermal noise suppressors. This concept was developed under a NASA sponsored program." @default.
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- W2329473012 date "1991-06-03" @default.
- W2329473012 modified "2023-09-23" @default.
- W2329473012 title "A Low Noise Propulsion Concept for the Supersonic Transport" @default.
- W2329473012 doi "https://doi.org/10.1115/91-gt-397" @default.
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