Results 41 to 50 of about 1,929,704 (249)
Poro-Serrated trailing edge devices for airfoil self-noise reduction [PDF]
, 2015 This paper represents the continuation of the works previously published in Chong et al. (“Self-Noise Produced by an Airfoil with Nonflat Plate Trailing-Edge Serrations,” AIAA Journal, Vol. 51, No. 11, 2013, pp. 2665–2677), who used several nonflat plate
Chong, TP, Joseph, PF, Vathylakis, A
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A Far-Field Helicopter Acoustic Detection Method Based on FRESH Adaptive Filtering
Applied SciencesHelicopter detection plays a vital role in obtaining critical aerial information promptly and ensuring the safety of lives and property. Since a helicopter’s aerodynamic noise primarily consists of main rotor noise, the cyclostationarity of this noise ...
Yingmeng Tao, Chunhua Wei, Tingting Liu
doaj +1 more source
Short-duration, transonic flow, variable-porosity test section [PDF]
, 1970 Short-duration test facility obtains extremely high Reynolds number flows in subsonic, transonic, and supersonic speed ranges, and aids in solving Reynolds number-dependent aerodynamic and thermodynamic problems in design and testing of large, high speed
Davis, J. W., Hill, O. E.
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Applied Sciences, 2020 Low-speed axial cooling fans are frequently used to manage engine temperature by ensuring that adequate quantities of air pass through heat exchangers, even at low vehicle speeds or in the idle condition. This study aims to provide a better understanding
Jang-oh Mo, Jae-Hyuk Choi
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Research on Noise Reduction of Axial Flow Fan Cover Based on CFD/CAA [PDF]
E3S Web of ConferencesTaking an axial fan for an electronic equipment chassis as the research object, combining the theories of Computational Fluid Dynamics (CFD) and Computational Aerodynamic Acoustics (CAA), the steady state and non-stationary analyses are carried out by ...
Chen Kui +4 more
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High-directivity acoustic antenna [PDF]
, 1974 Acoustic antenna with unique electronic steering control is used to identify and define aerodynamic noise sources in free field, particularly in wind tunnel which is quite reverberant.
El-Sum, H. M. A.
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Influence of blade aerodynamic model on prediction of helicopter rotor aeroacoustic signatures [PDF]
, 2011 Brown’s vorticity transport model has been used to investigate how the local blade aerodynamic model influences the quality of the prediction of the high-frequency airloads associated with blade–vortex interactions, and thus the accuracy with which the ...
Boyd D. D. +14 more
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Effect of cavity flow control on high-speed train pantograph and roof aerodynamic noise
, 2020 The pantograph and its recess on the train roof are major aerodynamic noise sources on high-speed trains. Reducing this noise is particularly important because conventional noise barriers usually do not shield the pantograph.
Hogun Kim, Zhiwei Hu, D. Thompson
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Applied Sciences, 2021 This paper concerns the application of a linear microphone array in the quantitative evaluation of blade trailing-edge (TE) noise reduction. The noise radiation from the blades with straight and serrated TEs is measured in an indoor open-jet wind tunnel.
Weijie Chen +4 more
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Influence of blade aerodynamic model on the prediction of helicopter high-frequency airloads [PDF]
, 2011 Brown’s vorticity transport model has been used to investigate the influence of the blade aerodynamic model on the accuracy with which the high-frequency airloads associated with helicopter blade–vortex interactions can be predicted.
Benoît B. +18 more
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