New technique for the direct measurement of core noise from aircraft engines
Abstract
The core noise levels from gas turbine aircraft engines were measured using a technique which requires that fluctuating pressures be measured in the far field and at two locations within the engine core. The cross spectra of these measurements are used to determine the levels of the far-field noise that propagated from the engine vore. The technique makes it possible to measure core noise levels even when other noise sources dominate. The technique was applied to signals measured from an Avco Lycoming YF102 turbofan engine. Core noise levels as a function of frequency and radiation angle were measured and are presented over a range of power settings.
- Publication:
-
Presented at the 17th Joint Propulsion Conf
- Pub Date:
- 1981
- Bibcode:
- 1981jpsc.conf...27K
- Keywords:
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- Aeroacoustics;
- Engine Noise;
- Jet Aircraft Noise;
- Noise Measurement;
- Turbofan Engines;
- Combustion Chambers;
- Far Fields;
- Low Frequencies;
- Noise Prediction (Aircraft);
- Acoustics