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Gaps and ways forward in atmospheric blocking and extreme weather research. [PDF]
Nat CommunWang L +9 more
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Quantum color image encryption using a novel 4D hyperchaotic Lorenz system and Fibonacci transform. [PDF]
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On autocorrelation analysis of jet noise
Journal of the Acoustical Society of America, 2013Meaningful use of the autocorrelation in jet noise analysis is examined. The effect of peak frequency on the autocorrelation function width is removed through a temporal scaling prior to making comparisons between measurements or drawing conclusions about source characteristics.
Blaine M Harker +2 more
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Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2010
Jets are one of the most fascinating topics in fluid mechanics. For aeronautics, turbulent jet-noise modelling is particularly challenging, not only because of the poor understanding of high Reynolds number turbulence, but also because of the extremely low acoustic efficiency of high-speed jets.
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Jets are one of the most fascinating topics in fluid mechanics. For aeronautics, turbulent jet-noise modelling is particularly challenging, not only because of the poor understanding of high Reynolds number turbulence, but also because of the extremely low acoustic efficiency of high-speed jets.
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On the Generation of Jet Noise
The Journal of the Acoustical Society of America, 1974It is proposed that the rate of subharmonic production, that is, the rate at which large-scale vortex-ring-like structures interact with each other, is the primary mechanism responsible for most of the noise generation of a subsonic jet. The interaction consists of simultaneous acceleration and deceleration of vorticity containing coherently moving ...
Laufer, J., Kaplan, R. E., Chu, W. T.
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The Journal of the Acoustical Society of America, 1972
Ribner's proposed basic directivity of jet noise together with the modified Lighthill's convection effect have been used to predict the acoustic power of subsonic jets from a single point intensity measurement at 90° from the jet axis. The prediction was found to be very good from low subsonic to near sonic speeds for a 2-in.-diam model jet.
Chu, W. T., Peterson, R. A., Kao, K.
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Ribner's proposed basic directivity of jet noise together with the modified Lighthill's convection effect have been used to predict the acoustic power of subsonic jets from a single point intensity measurement at 90° from the jet axis. The prediction was found to be very good from low subsonic to near sonic speeds for a 2-in.-diam model jet.
Chu, W. T., Peterson, R. A., Kao, K.
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The influence of jet flow on jet noise. II: The noise of heated jets
Journal of Fluid Mechanics, 1976This paper continues the study of part 1 into the area of the noise of heated jets. First, this part of the study discusses how a convected wave equation approach based on Lilley's equation leads to additional dipole and simple source terms associated with the velocity fluctuations due to transverse gradients of the mean density of the flow. Once these
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