Aerodynamic noise - A review of the contributions to jet noise research at the College of Aeronautics, Cranfield 1949-1961 (together with some recent conclusions)
Abstract
The development of experimental and theoretical techniques for understanding jet noise is traced. Research was spurred by the need to reduce noise if public acceptance of jet-powered aircraft for civil aviation was to be gained. Turbulence was recognized early as the source of jet noise. Corrugated nozzles were devised as a first cut in noise reduction. Microphonic and Schlieren photographic trials were performed in the 1950s to characterize the acoustic emission field. Conclusions drawn from those tests and efforts to numerically model the noise field are outlined. The tests revealed the importance of considering both vortex and enthalpy fields, and showed that Lighthill's acoustic analogy was valid at low Mach numbers.
- Publication:
-
Aeronautical Journal
- Pub Date:
- May 1984
- Bibcode:
- 1984AeJ....88..213L
- Keywords:
-
- Aerodynamic Noise;
- Jet Aircraft Noise;
- Noise Reduction;
- Atmospheric Turbulence;
- Civil Aviation;
- Far Fields;
- Flow Visualization;
- Lighthill Method;
- Mathematical Models;
- Near Fields;
- Noise Measurement;
- Nozzle Design;
- Acoustics