Results 71 to 80 of about 6,303 (162)
Acoustic Experiments for Special Forces Helicopter Operations
AerospaceFor military missions, the helicopter is a versatile aircraft with many benefits. However, the high levels of noise radiation enable large acoustic detection ranges. For mission success, knowledge of acoustic radiation and propagation is paramount.
W. F. J. Olsman
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Theoretical Foundation of Rapid Distortion Theory on Transversely Sheared Mean Flows
Fluids, 2020 The focus of this paper is on Rapid Distortion Theory on transversely sheared mean flows, which is often used to investigate turbulence-solid surface interactions.
Marvin E. Goldstein
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Spatiotemporal optical vortex reconnections of loop vortices
Nanophotonics, Volume 14, Issue 6, Page 729-739, April 2025.Abstract Reconnections of spatiotemporal optical vortices have been shown to occur between line vortices. Here, we show that reconnections also occur between spatiotemporal loop vortices in optical waves. As optical loop vortices propagate in a media with spatial diffraction and material group velocity dispersion, unique reconnections occur.
Jordan Adams, Andy Chong
wiley +1 more source
TechnologiesThis study explores the aeroacoustic influence of leading-edge serrations applied to stator blades subjected to turbulent inflow, which is representative of rotor–stator interaction in turbomachinery. A set of serrated geometries—75 mm span, with up to 9
Andrei-George Totu +5 more
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Experimental acoustic study of small horizontal axis wind turbines based on computational fluid dynamics and artificial intelligence approaches [PDF]
مهندسی مکانیک شریفIn modern wind turbine design, two significant challenges arise: achieving optimal aerodynamic performance while minimizing acoustic noise emissions.
M. Sadeghi malekabadi, A.R. Davari
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Wind Energy, Volume 28, Issue 3, March 2025.ABSTRACT The airfoil DU91‐W2‐150 was investigated in the Low Speed Low Turbulence Tunnel at the Delft University of Technology to study unsteady aerodynamics. This experimental study tested the airfoil under a wide range of angles of attack (AoA) from 0° to 310° at three Reynolds numbers (Re$$ \mathit{\operatorname{Re}} $$) from 2×105$$ 2\times 1{0}^5 $
Guanqun Xu +3 more
wiley +1 more source
, 2017 In hybrid computational aeroacoustics, the acoustic computation domain is oftentimes larger than the domain of the flow simulation. Consequently, discontinuities of the source field occur on the acoustic mesh, which can diminish the quality of the ...
Estorff, Otto von, Schröder, Thorben
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Advances in Astronomy, Volume 2025, Issue 1, 2025.Infrasound, low‐frequency sound below 20 Hz, has been a key technology to monitor explosion events in the atmosphere. The International Monitoring System (IMS) of the Comprehensive Nuclear‐Test‐Ban Treaty Organization provides the means for continuous monitoring of infrasonic events worldwide.
Keehoon Kim, Elizabeth A. Silber
wiley +1 more source
The present paper deals with a numerical investigation of the aeroacoustics of Distributed electric propulsion systems. In particular, the analysed configuration consists of three propellers mounted in front of the wing leading edge.
Vitagliano, Pier Luigi +4 more
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First joint CEAS/AIAA aeroacoustics conference. Proceedings. Vol. 1
, 1995 The volumes I and II of the proceedings of the First Joint CEAS/AIAA Aeroacoustic Conference held in June 12-15, 1995 in Munich, Germany contain (69+71=) 140 papers. The papers deal with the following scientific subjects: computational aeroacoustics; jet
American Inst. of Aeronautics and Astronautics (AIAA), Washington, DC (United States) +2 more
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