A study was conducted to define specific ground-to-flight effects on the noise of a low-bypass-ratio engine. The analysis was based on acoustic data recorded during the FAA-sponsored 727 Noise Retrofit Feasibility Program. Two configurations, a baseline and an ejector suppressor nacelle, were included in the study. Noise flight effects were obtained by comparing JT8D ground static and 727/JT8D flight acoustic data. Procedures are defined for normalizing static and flight data to common conditions. The analysis considered both jet and fan noise characteristics for five engine power settings. The results of this study will provide a guideline for establishing flight effects technology. (Author)
727/JT8D Jet and Fan Noise Flight Effects Study
1976
295 pages
Report
No indication
English
Air Transportation , Noise Pollution & Control , Jet & Gas Turbine Engines , Jet engine noise , Turbofan engines , Jet transport planes , Configurations , Ejectors , Axial flow fans , Jet engine nacelles , Installation , External stores , Static tests , Flight testing , Noise pollution , Noise reduction , Boeing 727-100 aircraft , Boeing 727 aircraft , JT-8D engines , Ejector suppressors , Flight noise