Results 101 to 110 of about 11,915 (202)

Leading-Edge Noise Mitigation on a Rod–Airfoil Configuration Using Regular and Irregular Leading-Edge Serrations

Applied Sciences
Rod–airfoil configurations are commonly used to study turbulence–structure interaction noise, which is a major contributor to aerodynamic noise in various engineering applications.
Mehmet Numan Kaya, Sutharsan Satcunanathan, Matthias Meinke, Wolfgang Schröder   +3 more
doaj   +1 more source

Transonic blade-vortex interactions noise: A parametric study [PDF]

Transonic Blade-Vortex Interactions (BVI) are simulated numerically and the noise mechanisms are investigated. The 2-D high frequency transonic small disturbance equation is solved numerically (VTRAN2 code). An Alternating Direction Implicit (ADI) scheme
Lyrintzis, A. S., Xue, Y.
core   +1 more source

Experimental Investigation of Rotor Noise in Reverse Non-Axial Inflow

Aerospace
This paper experimentally characterises the far-field noise emissions of a rotor operating in reverse non-axial inflow conditions. Specifically, experiments were undertaken at a range of rotor tilting angles and inflow velocities to investigate the ...
Liam Hanson, Leone Trascinelli, Bin Zang, Mahdi Azarpeyvand   +3 more
doaj   +1 more source

Influence of Gurney Flap and Leading-Edge/Trailing-Edge Flaps on the Stall Characteristics and Aeroacoustic Performance of Airfoils

Fluids
In aerospace, flow control techniques have improved the separation flow characteristics around airfoils by various means. In this paper, the delayed detached eddy simulation (DDES) technique is used to simulate the detailed flow field around the NACA0021
Zelin Liu, Kaidi Li, Xiaojing Sun
doaj   +1 more source

Near-Field Pressure Signature of New-Concept Supersonic Aircraft Obtained Using Open-Source Approach

Sci
This study investigates the numerical prediction of the sonic boom phenomenon in supersonic aircraft by evaluating the near-field pressure signatures of three different aeroshapes.
Antimo Glorioso, Francesco Petrosino, Mattia Barbarino, Giuseppe Pezzella   +3 more
doaj   +1 more source

Acoustic Experiments for Special Forces Helicopter Operations

Aerospace
For 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
doaj   +1 more source

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, Gabard, Gwenael, Prinn, Albert   +2 more
core   +1 more source

Application of Passive Serration Technologies for Aero-Engine Noise Control in Turbulent Inflow Environments

Technologies
This 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, Daniel-Eugeniu Crunțeanu, Marius Deaconu, Grigore Cican, Laurențiu Cristea, Constantin Levențiu   +5 more
doaj   +1 more source

Acoustic Phased Array Quantification of Quiet Technology Demonstrator 3 Advanced Inlet Liner Noise Component [PDF]

Acoustic phased array flyover noise measurements were acquired as part of the Boeing 737 MAX-7 NASA Advanced Inlet Liner segment of the Quiet Technology Demonstrator 3 (QTD3) flight test program.
Brusniak, Leon, Jones, Michael G., Nark, Douglas M., Nesbitt, Eric H., Wong, Jackie W.   +4 more
core   +1 more source

Railway Line Occupancy Control Based on Distance Determination Sound Method. [PDF]

Sensors (Basel), 2022
Burdzik R, Celiński I, Kłaczyński M.
europepmc   +1 more source