Unsteady characteristics of a slat-cove flow field

Pascioni, Kyle A.; Cattafesta, Louis N.

doi:10.1103/physrevfluids.3.034607

Cited by 41 publications

(35 citation statements)

References 23 publications

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“…Richard, Wilkins & Hall (2018) performed time-domain POD computations based on sectional particle image velocimetry (PIV) data of the flow in the slat cove, and educed mixing-layer vortices at a frequency that is consistent with Rossiter-like modes predicted from Terracol’s model. PIV measurements by Pascioni & Cattafesta (2018) also revealed coherent mixing-layer fluctuations associated with the narrowband peaks.…”

Section: Introductionmentioning

confidence: 85%

“…The consistent observation in this regard is that the noise at this range decreases significantly and the frequencies of the narrowband peaks decrease slightly as the angle of attack increases. Wind tunnel experiments by Pascioni & Cattafesta (2018) and simulations by Pagani et al (2016) indicate that, as the angle of attack increases, the spanwise coherence of the mixing-layer disturbances at the peak frequencies decreases significantly.…”

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confidence: 99%

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Dynamics of the large-scale structures and associated noise emission in airfoil slats

et al. 2019

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We investigate the slat narrowband peak noise generating mechanism. Unsteady flow data were generated by a lattice-Boltzmann-based commercial code for four configurations, accounting for variations of the airfoil angle of attack and slat overlap. Comparison with experimental results indicates that the aspects of the flow field relevant for the generation of the narrowband peaks were accurately captured. Frequency-domain proper orthogonal decomposition (POD) is applied to identify dominant large-scale structures in the frequency range dominated by the peaks. The combined use of the two POD metrics, namely, the turbulent kinetic energy in the turbulent flow region and the acoustic pressure in the far field, demonstrated that the structures most correlated with the noise resemble spanwise coherent Kelvin–Helmholtz vortices which dominate the slat cove only at the frequency of the narrowband peaks. Time evolution of the structures educed using the acoustic pressure correlation provides detailed evidence of the hydrodynamic and acoustic steps of a Rossiter-like feedback mechanism between the slat cusp and trailing edge. The combined analysis of results for the different slat configurations provides an explanation for the effect of the slat configuration on the amplitude of the narrowband peaks observed in previous studies, particularly the influence of the main-element suction peak.

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Section: Introductionmentioning

confidence: 85%

mentioning

confidence: 99%

Dynamics of the large-scale structures and associated noise emission in airfoil slats

et al. 2019

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“…The measurements are conducted using an aluminum 30P30N multi-element airfoil with a stowed chord length ( c ) and span of 150 and 500 mm, respectively. The aspect ratio of 3.33 (Jenkins, Khorrami & Choudhari 2004; Pascioni & Cattafesta 2018) and the circular endplates at two sides of the airfoil (Boutilier & Yarusevych 2012 a ) guarantee a quasi-two-dimensional mean flow around the middle region of the airfoil (Wang et al. 2018 b ).…”

Section: Experimental Methodsologymentioning

confidence: 99%

“…Correspondingly, the low-Reynolds-number flows over multi-element airfoils should be deeply understood in flow physics to realize this conception. As the main contributor to lift generation (Pascioni & Cattafesta 2018), the main element inherently bears the disturbance of slat wakes (Squire 1989). The slat wake can even merge with the original boundary layer of the main element and finally lead to a confluent boundary layer (Thomas, Nelson & Liu 2000).…”

Section: Introductionmentioning

confidence: 99%

Wake-induced transition in the low-Reynolds-number flow over a multi-element airfoil

Wang

2021

J. Fluid Mech.

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“…POD analysis is best suited for problems that involve vortex shedding such as slat cove flow discussed in the present study. This method has been used by researchers for a variety of flow problems such as airfoils, cavities, bluff-bodies, and jets [33][34][35][36][37]. The results from the PIV were used to determine the optimal energy set from the eigenfunctions, where the first mode contains the highest energy with reducing energy with increasing modes.…”

Section: B Proper Orthogonal Decompositionmentioning

confidence: 99%

Aerodynamic and Aeroacoustic Performance of Three-element High Lift Airfoil fitted with Morphing Fillers

Jawahar¹,

Azarpeyvand²,

Theunissen³

et al. 2018

2018 AIAA/CEAS Aeroacoustics Conference

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Experiments involving a three-element airfoil (30P30N) fitted with various slat cove-and flap covefiller configurations were carried out in order to characterize the aerodynamic and aeroacoustic behavior of the cove-fillers. The tests were completed for a wide range of angles of attack and Reynolds numbers (4.6 × 10 5 to 1.1 × 10 6). Aerodynamic measurements included, lift and drag measurements, mean and unsteady surface pressure measurements, mean velocity profiles, Reynolds stress profiles and flow visualization around the slat and flap region for all the aforementioned configurations. Lift and drag measurement showed insignificant difference amongst the tested cove filler configurations compared to the baseline. Mean surface pressure measurement results show that the aerodynamic performances were not significantly affected by the application of slat cove-filler for the tested flow condition. The mean velocity contour results from the Particle Image Velocimetry measurements show a highly energized vortex present within the slat cove region of the baseline case and it was eliminated by the application of slat cove-filler. Vortices found within in the flap cove region were completely eliminated by the application of flap cove-filler. Proper Orthogonal Decomposition analysis for all the configurations detailing on the coherent structures formed within the slat cove shear layer and slat wake was also presented. The wall-pressure spectra acquired using the flush mounted transducers shows narrowband and broadband components for the baseline case. The application of slat cove-fillers completely eliminated the narrowband spectra generated by the vortices inside the slat cove. However, the slat cove-filler appears to increase the overall broadband at the low and mid-frequency range in the airfoil near-field.

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Unsteady characteristics of a slat-cove flow field

Cited by 41 publications

References 23 publications

Dynamics of the large-scale structures and associated noise emission in airfoil slats

Dynamics of the large-scale structures and associated noise emission in airfoil slats

Wake-induced transition in the low-Reynolds-number flow over a multi-element airfoil

Aerodynamic and Aeroacoustic Performance of Three-element High Lift Airfoil fitted with Morphing Fillers

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