An aeroacoustic study of a leading-edge slat: Beamforming and far field estimation using near field quantities

Pascioni, Kyle A.; Cattafesta, Louis N.

doi:10.1016/j.jsv.2018.05.029

Cited by 34 publications

(28 citation statements)

References 38 publications

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“…2019). These narrowband peak Strouhal numbers are consistent with the literature (Pascioni & Cattafesta 2018 a , b ). The high-frequency hump is not observed in our simulations, but it is possibly very sensitive to numerical dissipation (Souza et al.…”

Section: Spectral and Spod Analysessupporting

confidence: 92%

“…There is also a low-frequency noise (Strouhal number below 1 for the baseline case and below 0.5 for the two-bubble case) in the early stages of the mixing layer. It is possible that this is linked to the very-low-frequency oscillations reported by Pascioni & Cattafesta (2018 a , b ) and associated with mixing-layer flapping, but our data are insufficient to investigate these oscillations.…”

Section: Spectral and Spod Analysesmentioning

confidence: 79%

“…2009). In a recent study, Pascioni & Cattafesta (2018 a ) identified yet another component, a very-low-frequency oscillation which is referred to as breathing.

Figure 1.Scheme of slat flow.…”

Section: Introductionmentioning

confidence: 99%

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SPOD analysis of noise-generating Rossiter modes in a slat with and without a bulb seal

et al. 2021

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Section: Spectral and Spod Analysessupporting

confidence: 92%

Section: Spectral and Spod Analysesmentioning

confidence: 79%

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SPOD analysis of noise-generating Rossiter modes in a slat with and without a bulb seal

et al. 2021

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“…Choudhari and Khorrami [12] showed that the overall slat noise is generated from the unsteady flow within the slat cove region originating from the vortex shedding at the slat cusp and the slat trailing edge. Terracol et al [22] showed that the strong tonal peak in the mid-frequency range (St s = 1 − 5) is generated due to the flow acoustic feedback of slat cove shear layer instabilities, which has also been observed in other studies [12][13][14][15][16][17][18][19][20][21][22][24][25][26][27][28][29][30][31]. The results are also indicative that the tonal peaks are associated with the cavity feedback mechanism, known as the Rossiter modes [56,57].…”

Section: Introductionmentioning

confidence: 55%

Aerodynamic and aeroacoustic performance of high-lift airfoil fitted with slat cove fillers

Jawahar

Ali

Azarpeyvand

et al. 2020

Journal of Sound and Vibration

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Experimental measurements were carried out to assess the aerodynamic and aeroacoustic performance of an MDA 30P30N airfoil fitted with two different types of slat cove fillers. The aerodynamic results are presented for lift and drag measurements and mean surface pressure measurements, while the aeroacoustic results are presented for the near-field surface pressure fluctuations and far-field noise measurement. The flow measurement results show that there is no significant difference in the aerodynamic lift and drag between the tested cases, however, the slat cove filler configurations exhibit a much better lift-to-drag performance. The pressure coefficient results show that the use of slat cove fillers leads to a slight decrease in the suction peak over the main-element of the airfoil. In order to better understand the flow-field and the noise generation mechanism of the airfoil with slat cove fillers, simultaneous near-field and far-field noise measurements were carried out. The result shows that the use of the slat cove filler can generally lead to a significant reduction of the broadband noise and eliminate the characteristic tonal noise generated by the slat. The directivity pattern and the overall sound pressure level of the radiated noise have shown that a significant noise reduction can be achieved with the applications of the slat cove fillers. The multiple tonal phenomena generated by the slat were also analysed using the continuous wavelet transform method and higher order spectral analysis methods.

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“…Studies on conventional slat and wing configurations have shown that it mainly comprises of broadband and tonal noise components. Several studies on slat noise have shown several discrete tones at mid-frequency range [17][18][19][20][21][22][23][24][25][26][27][28][29]. However, their aeroacoustic mechanism is yet to be fully understood.…”

mentioning

confidence: 99%

Aeroacoustic Performance of High-lift Airfoil with Slat Cove Fillers

Jawahar

Ali

Azarpeyvand

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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An aeroacoustic study of a leading-edge slat: Beamforming and far field estimation using near field quantities

Cited by 34 publications

References 38 publications

SPOD analysis of noise-generating Rossiter modes in a slat with and without a bulb seal

SPOD analysis of noise-generating Rossiter modes in a slat with and without a bulb seal

Aerodynamic and aeroacoustic performance of high-lift airfoil fitted with slat cove fillers

Aeroacoustic Performance of High-lift Airfoil with Slat Cove Fillers

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