Results 21 to 30 of about 2,019 (78)
Near field pressure fluctuations in a circular jet [PDF]
The vortical structures in shear layers govern many dynamic aspects of the jet, including entrainment of mass, transfer of momentum and noise generation. These structures develop from instability waves and undergo a merging process.
Ho, C. M.
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Available information on the physical characteristics of the noise generated by wind turbines is summarized, with example sound pressure time histories, narrow- and broadband frequency spectra, and noise radiation patterns. Reviewed are noise measurement
Hubbard, Harvey H., Shepherd, Kevin P.
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Exploration of combustion instability triggering using Large Eddy Simulation of a multiple injector Liquid Rocket Engine [PDF]
, 2016 This article explores the possibility of analyzing combustion instabilities in liq- uid rocket engines by making use of Large Eddy Simulations (LES). Calculations are carried out for a complete small-scale rocket engine, including the injection manifold ...
Candel, Sébastien +6 more
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Spatial Correlation in the Ambient Core Noise Field of a Turbofan Engine [PDF]
An acoustic transfer function relating combustion noise and turbine exit noise in the presence of enclosed ambient core noise is investigated using a dynamic system model and an acoustic system model for the particular turbofan engine studied and for a ...
Miles, Jeffrey Hilton
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Finite element simulation of noise radiation through shear layers
, 2012 Predicting sound propagation through the jet exhaust of an aero-engine presents the specific difficulty of representing the refraction effect of the mean flow shear.
Beriot, Hadrien +2 more
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Acoustics Division recent accomplishments and research plans [PDF]
The research program currently being implemented by the Acoustics Division of NASA Langley Research Center is described. The scope, focus, and thrusts of the research are discussed and illustrated for each technical area by examples of recent technical ...
Clark, L. R., Morgan, H. G.
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86th Annual Meeting of the Meteoritical Society (2024)
Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley +1 more source
Prediction and reduction of rotor broadband noise [PDF]
Prediction techniques which can be or have been applied to subsonic rotors, and methods for designing helicopter rotors for reduced broadband noise generation are summarized.
Aravamudan, K. S., Hayden, R. E.
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On the theory of surface waves in water generated by moving disturbances [PDF]
, 1957 The wave profile generated by an obstacle moving at constant veiocity U over a water surface of infinite extent appears to be stationary with respect to the moving body provided, of course, the motion has been maintained for a long time.
De Prima, C. R., Wu, T. Y.
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