Portal de Periódicos da CAPES

Prediction of jet exhaust noise on airframe surfaces during low-speed flight

1982; American Institute of Aeronautics and Astronautics; Volume: 19; Issue: 12 Linguagem: Inglês

10.2514/3.44809

1533-3868

L. M. Butzel,

Combustion and flame dynamics

The behavior of pressure fluctuations measured on the airframe of a prototype high-lift jet transport (YC-14) is presented. Efforts to characterize the data in terms of a modest number of parameters and the resulting prediction procedures are described. Comparisons with near field engine exhaust noise of a conventional jet transport (Boeing 747) are presented. The results suggest that at low speeds the same exhaust noise source is important for both aircraft types. The results also suggest a consistent frequency sensitivity, as well as level sensitivity to airplane velocity. The frequency result appears to be new data.