Turbojet Engine Noise Reduction With Mixing Nozzle Ejector Combinations
Download Turbojet Engine Noise Reduction With Mixing Nozzle Ejector Combinations PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Turbojet Engine Noise Reduction With Mixing Nozzle Ejector Combinations book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages.
Turbojet Engine Noise Reduction with Mixing Nozzle-ejector Combinations
Several noise suppressors consisting of combinations of mixing nozzles and ejectors were tested on two full-scale turbojet engines. Maximum sound pressure level reductions of 12 decibels and sound power level reductions of 8 decibels were obtained. The ejectors provided 3 to 5 decibels of the sound power reduction. The effects of ejector dimensions on noise suppression and engine performance were investigated. Ejector lengths of approximately 2.0 standard nozzle diameters and ejector diameters larger than 1.6 standard nozzle diameters provided the greatest additional noise reduction to that obtained with the mixing nozzles alone. The ejector can restore the static thrust loss caused by use of the mixing nozzle or can provide static-thrust augmentation.