WebJul 1, 2010 · Abstract. An experimental investigation was conducted with the aim to reveal the frequency-selection mechanism of the acoustic noise emanated from the trailing edge of two-dimensional airfoils ... WebJul 22, 1983 · For example, discrete tones from isolated airfoils have been observed at low speeds and reported by Fink [3], Paterson et al. [4] and Tam [5]. These discrete tones share some of the characteristics of the tone "bursts" observed here. A laminar boundary layer must be maintained for the tone to occur, the flow must be attached to the airfoil, …
Frequency Selection Mechanism of Airfoil Trailing-Edge Noise
WebMar 30, 2024 · 1) Discrete tones are detected within the AoA range of 3°-9°. The short-time Fourier transform results confirm that the generation of the secondary discrete tones … WebMar 30, 2024 · For the baseline airfoil, discrete tones are detected when the angle of attack is larger than 3 ° , and the generation of tones is attributed to the large-scaled coherent structure shed from the ... charge on h2o
Vortex Noise of Isolated Airfoils Journal of Aircraft
WebJul 2, 2024 · The velocity spectra agree well with the noise spectra in terms of broadband humps and discrete tones. Through proper orthogonal decomposition (POD) analysis, the most energetic modes are identified, which represent global structures in the flow field. ... “ Vortex noise of isolated airfoils,” J. Aircraft 10(5), 296 ... WebJul 1, 2024 · Discrete tones of isolated airfoils J. Acoust. Soc. Am. (1974) FinkM.R. Prediction of airfoil tone frequencies J. Aircraft (1975) ArbeyH. et al. Noise generated by airfoil profiles placed in a uniform laminar flow J. Fluid Mech. (1983) NashE.C. et al. Boundary-layer instability noise on aerofoils J. Fluid Mech. (1999) View more references WebAbstract. Tonal noise, the self-induced discrete frequency noise generated by aerofoils, is investigated. It is heard from an aerofoil placed in streams at low Mach number flows … charge on innovation