A study on aerodynamic sound from an externally excited flexible structure in flow

Purohit, Ashish; Darpe, Ashish K.; Singh, Shveta

doi:10.1016/j.compfluid.2014.07.010

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…6. The sound generated by a thin, fluttering, elastic structure is of recent interest to researchers like Manela et al [123][124][125] and Purohit et al [126]. For flag VG to be a desirable thermal enhancement technique, the sound coming from flag flutter should be modulated.…”

Section: Gaps and Challengesmentioning

confidence: 99%

Heat transfer performance of flag vortex generators in rectangular channels

Gallegos

Sharma

2019

International Journal of Thermal Sciences

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Section: Gaps and Challengesmentioning

confidence: 99%

Heat transfer performance of flag vortex generators in rectangular channels

Gallegos

Sharma

2019

International Journal of Thermal Sciences

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“…A further study done by Purohit et al. 120 highlighted the role of flexibility effects in the aerodynamic sound produced from a flow-induced vibration of the elastic plate under external harmonic forced excitation. They indicated that the harmonic force excitation of the flexible plate, such as amplitude and frequency, has a great impact on resultant far-field aerodynamic sound.…”

Section: Effects On Wing Acousticsmentioning

confidence: 99%

Recent progress in flexibility effects on wing aerodynamics and acoustics

Prapamonthon

Yin

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Since the theoretical aeroelasticity for flapping-wing aerodynamics was introduced in the 1920s, the effects of flexibility on aeroelasticity have been paid more attention to aerodynamic design. In recent years, the trait of the wing flexibility is applied for small-scale wings of biomimetic flyers including micro air vehicles and mini unmanned aerial vehicles. Until now, the aerodynamic performance and great agility of these flyers, which are beneficially used for military missions and other civilian applications, have been improved through surrogate flapping wings with the favorable effects of the flexibility. As per the aeroelasticity principle for the forward flying, the chordwise flexibility of an elastic flapping wing can generate thrust and lift redistributions, whereas the spanwise flexibility can result in variations of the angle of attack and the shift of phase along the wingspan direction. Consequently, all vortices generated by the flapping wing i.e. (1) leading-edge vortices, (2) tip vortices, and (3) trailing-edge vortices are blended supportively, thereby improving the aerodynamic performance and agility. Hence, the growth of research and development of the aerodynamic performance and agility for these flyers under the influence of flexible wings increases through experimental and computational studies dynamically and rapidly. This review aims to highlight the important role of the flexibility in the recent progress in wing aerodynamics of these flyers through several wing models done by famous groups of experts in this field. In addition, this review includes the acoustics of the wings under the flexibility effects which is considered as a new key for better flyer design and improvement. A comprehensive understanding of the integrated aerodynamics and acoustics under the wing flexibility is, therefore, needed.

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“…The number of higher tones can be related to the level of peak deflection of the plate. As the fluctuating pressure field is resultant of coupled dynamics of structural vibration and fluid motion, it appears that the larger plate displacement causes higher distortion in the radiating pressure perturbations (Purohit et al., 2014a). Similarly, in the case of flow velocities 25 m/s, maximum number of higher tones has been observed for the plates of E = 80 GPa.…”

Section: Acoustic Field Computationmentioning

confidence: 99%

Influence of flow velocity and flexural rigidity on the flow induced vibration and acoustic characteristics of a flexible plate

Purohit

Darpe

Singh

2017

Journal of Vibration and Control

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A numerical investigation on the influence of structural flexibility and flow velocity on the flow-induced acoustic and vibration response of a plate is presented. Simulations are performed on a test geometry of rigid square bluff body with a trailing flexible plate in low Reynolds number flow stream. The focus of the study is to characterize the flow-induced vibration and associated aerodynamic far field sound radiation from a flexible structure in flow. The role of flow velocity and level of structural flexibility on the acoustic radiation is thoroughly investigated. A linearized Euler equation based computational aeroacoustic hybrid method and a surface source approach for coupling the flow and acoustic domains are implemented with a bi-directional fluid structure interaction. The vortex shedding frequency of the coupled fluid-structure system synchronizes with the fundamental frequency of the trailing plate and steady-state vibration of the plate is observed. The results indicate that the relation between vibration level and the flow velocity as well as structural flexibility is not linearly related. For a particular combination of flow velocity and plate stiffness, the coupled fluid-structure system shows the resonance condition. The observed resonance frequency is slightly different from the free vibration (natural) frequency of the plate. Computation of the acoustic shows that the magnitude and spectral nature of the far field sound depends on the amplitude of the vibration and a higher acoustic pressure and the sound rich in tones is observed at resonance condition.

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A study on aerodynamic sound from an externally excited flexible structure in flow

Cited by 11 publications

References 33 publications

Heat transfer performance of flag vortex generators in rectangular channels

Heat transfer performance of flag vortex generators in rectangular channels

Recent progress in flexibility effects on wing aerodynamics and acoustics

Influence of flow velocity and flexural rigidity on the flow induced vibration and acoustic characteristics of a flexible plate

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