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Fundamental Investigation of Noise Generation by Turbulent Jets
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English
Abstract
EQUATIONS relating to noise outside a turbulent jet to the turbulent velocities inside the jet have been derived making use of Lighthill's suggestion that the actual flow field can be simulated with a stationary field of quadrupoles.
Hot-wire anemometer techniques were applied to a 3V½-in. air jet to measure the turbulent structure of the mixing region. These measurements and the previously derived equations were used to estimate some of the characteristics of the sound field.
The estimated characteristics were found to be in good agreement with the experimentally measured sound field of a full-scale turbojet engine.
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Citation
Sanders, N. and Laurence, F., "Fundamental Investigation of Noise Generation by Turbulent Jets," SAE Technical Paper 570025, 1957, https://doi.org/10.4271/570025.Also In
References
- Proceedings of Royal Society Vol. 211 No. 1107 March 20 1952 564 587 “On Sound Generated Aerodynamically. I—General Theory,” Lighthill M. J.
- Proceedings of Royal Society Vol. 222 Feb. 23 1954 1 32 “On Sound Generated Aerodynamically. II—Turbulence as Source of Sound,” Lighthill M. J.
- NACA TN 3561 1955 “Intensity, Scale, and Spectra of Turbulence in Mixing Region of Free Subsonic Jet,” Laurence J. C.