Prediction of flyover jet noise spectra from static tests
Abstract
A scaling law is derived for predicting the flyover noise spectra of a single-stream shock-free circular jet from static experiments. The theory is based on the Lighthill approach to jet noise. Density terms are retained to include the effects of jet heating. The influence of flight on the turbulent flow field is considered by an experimentally supported similarity assumption. The resulting scaling laws for the difference between one-third-octave spectra and the overall sound pressure level compare very well with flyover experiments with a jet engine and with wind tunnel experiments with a heated model jet.
- Publication:
-
Presented at the 100th Meeting of the Acoust. Soc. of Am
- Pub Date:
- December 1981
- Bibcode:
- 1981asa..meet.....M
- Keywords:
-
- Jet Aircraft Noise;
- Noise Spectra;
- Prediction Analysis Techniques;
- Static Tests;
- Fluid Flow;
- Jet Engines;
- Noise (Sound);
- Performance Prediction;
- Turbulent Flow;
- Wind Tunnel Tests;
- Acoustics