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Noise Reduction of EBF Propulsive-Lift Systems
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English
Abstract
In a recently completed program, static and wind tunnel measurements have been made of the basic noise, noise reduction, and performance characteristics of externally blown flap (EBF) propulsive-lift systems. The static tests were performed on an outdoor model rig. Noise evaluations were made for parameters such as basic system geometry, flap slot dimension variation, elimination of flap slots, sweep angle variation, passive flap trailing edge modifications, active (blowing) trailing edge modifications, and for an ejector/decayer exhaust system. The wind tunnel evaluation determined forward speed effects on EBF systems noise characteristics. The results from the experimental programs are discussed as to their application to full scale short haul aircraft.
Authors
Citation
Gibson, J., "Noise Reduction of EBF Propulsive-Lift Systems," SAE Technical Paper 750608, 1975, https://doi.org/10.4271/750608.Also In
References
- Pennock A. P. Swift G. Marbert J. A. “Static and Wind Tunnel Model Tests For the Development of Externally Blown Flap Noise Reduction Techniques.” NASA Contractor Report CR-134675 February 1975