Noise Reduction Potential through Slat Hook Serrations

Kopiev, V. F.; Zaitsev, M. Yu.; Belyaev, I. V.; Mironov, M. A.

doi:10.2514/6.2011-2909

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…This is obsereved for both sweep angles (14 0 and 29 0 ). The new method to decrease slat noise, proposed by the authors [2][3] for wing without sweep, that utilizes the idea to have the lower edge of the slat with the chevron geometry, has been investigated for swept wings. The pictures of the studied chevron slats (S9-S11) are shown in Figure 22 The effect of chevron geometry on the decrease of narrowband peak and OASPL is shown in Figure 23 for the wing with sweep angle 29 0 and deployed HLD (δ slat =25°, δ flap =33°).…”

Section: Experiments With the Swept Wingmentioning

confidence: 99%

“…In the previous papers by the authors [2][3], a method to decrease the slat noise has been proposed that utilizes the idea to have the lower edge of the slat with the chevron geometry. Experimental investigations, carried out for a small-scale (1:18) 2D model of the wing with a slat and flap, prove the method perspective for slat noise mitigation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of sweep on chevron slat noise

Kopiev¹,

Zaitsev²,

Belyaev³

2013

19th AIAA/CEAS Aeroacoustics Conference

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Experimental investigation of the effect of sweep on slat noise has been performed for small-scale (1:18) models, which indicates that sweep can significantly modify airframe noise spectra. The new method of airframe noise mitigation based on the concept of chevron geometry for the slat's lower egde, which has been previously proved efficient for 2D wing models, has been assessed for the swept wing. It has been demonstrated that the method is effective for narrowband peak mitigation both for swept wing and 2D wing.

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Section: Experiments With the Swept Wingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of sweep on chevron slat noise

Kopiev¹,

Zaitsev²,

Belyaev³

2013

19th AIAA/CEAS Aeroacoustics Conference

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“…The aeroacoustic characteristics of slat noise are yet to be fully understood and are still of much interest to researchers. Slat noise reduction mechanisms 31 that have proven successful are slat cove cover 32 , slat hook extensions 33 , slat cove filler [34][35][36] , slat gap filler 37 , slat acoustic liners 38 , slat hook tripping 39 , slat hook serrations 40 , and slat trailing with porous or brush extensions 41,42 .…”

Section: Introductionmentioning

confidence: 99%

“…When considering slat serration there is a substantial lack in the available literature. However, a parametric study using seven different slat serrations with increasing serration wavelength was performed by Kopiev et al 40 . Serration with smaller wavelengths was shown to be sufficient enough for noise reduction of up to 8 dB for the narrow-band peak.…”

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confidence: 99%

Serrated slat cusp for high-lift device noise reduction

2021

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Noise reduction capabilities of slat cusp serration were experimentally assessed and demonstrated for a 30P30N three-element high-lift airfoil fitted with two different types of serrated slat cusp. Aerodynamic characteristics were evaluated with the aid of surface pressure distribution and insignificant differences were found amongst all the tested configurations. The unsteady flow characteristics of the slat serrations were examined using near-and far-field measurements to gain a deeper understanding of the noise generation mechanism. Although increased surface pressure fluctuations were demonstrated by the slat serrations, a substantial reduction in the far-field noise was observed. The increase in the near-field energy levels was attributed to the non-propagating hydrodynamic energy field within the slat cove and the main-element, whereas the far-field noise reduction was attributed to the elimination of vortex shedding by the slat serration. Further reaffirmation of the observations and hypothesis were provided with higher-order spectral analysis and wavelet analysis.

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“…Kopiev et al [44] performed a parametric study using seven serrations with increasing serration wavelength. They showed that the serration with a smaller wavelength was sufficient enough for noise reduction with up to 8 dB for the narrow-band peak.…”

mentioning

confidence: 99%

Aerodynamic and Aeroacoustic Performance of High-lift Airfoil with Serrated Slat Cusp

Jawahar¹,

Ali²,

Azarpeyvand³

et al. 2020

Aiaa Aviation 2020 Forum

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Experimental measurements to assess the aeroacoustic capabilities of 30P30N airfoil fitted with two different types of serrated slat cusps were carried out at the aeroacoustic wind tunnel at the University of Bristol. The results from the simultaneous surface pressure measurement within and close to the slat cove region and far-field noise measurements above the slat trailing edge are presented to gain a deeper understanding of the noise generation mechanism of the slat and other presented configurations. The far-field noise measurement results showed that significant noise reduction at the vortex shedding frequency can be achieved by the use of serration-2 and No-Cusp configuration. The coherence results for all the frequencies are almost zero for the No-Cusp configuration and the coherence was notably reduced for the Serration-2 configuration. Further higher order statistical and spectral analysis showed that even the serration-1 with small serrations reduces the energy within the norrowband peaks to some level.

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Noise Reduction Potential through Slat Hook Serrations

Cited by 17 publications

References 4 publications

Effect of sweep on chevron slat noise

Effect of sweep on chevron slat noise

Serrated slat cusp for high-lift device noise reduction

Aerodynamic and Aeroacoustic Performance of High-lift Airfoil with Serrated Slat Cusp

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