On the use of time-resolved particle image velocimetry for the investigation of rod–airfoil aeroacoustics

Lorenzoni, Valerio; Tuinstra, Marthijn; Scarano, Fulvio

doi:10.1016/j.jsv.2012.05.034

Cited by 23 publications

(13 citation statements)

References 38 publications

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“…To account for the spanwise coherence in pressure uctuations, a coherence weighted amplitude correction based on stereoscopic PIV measurements (see Appendix) was carried out following the method proposed by Kato et al [31]. The method was proven to work reasonably well by literatures such as [13] and [32].…”

Section: Acoustic Prediction With Fov 2-based Compact Formulationmentioning

confidence: 99%

“…Koschatzky et al [12] applied Curle's analogy and vortex sound theory to the noise prediction of an open, two-dimensional shallow cavity. Lorenzoni et al [13] investigated the acoustic emission from vortex-structure of a rod-airfoil conguration. More recently, Pröbsting et al [14] demonstrated the prediction of broadband noise, caused by the interaction of the turbulent boundary layer with the trailing edge, based on time-resolved tomographic PIV.…”

Section: Introductionmentioning

confidence: 99%

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Aeroacoustic analysis of an airfoil with Gurney flap based on time-resolved particle image velocimetry measurements

Zhang

Sciacchitano

Pröbsting

2018

Journal of Sound and Vibration

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Particle image velocimetry for the experimental assessment of trailing edge noise sources has become focus of research in recent years. The present study investigates the feasibility of the noise prediction for high-lift devices based on time-resolved particle image velocimetry (PIV). The model under investigation is a NACA 0015 airfoil with a Gurney ap with a height of 6% of the chord length. The velocity elds around and downstream of the Gurney ap were measured by PIV and used to compute the corresponding pressure elds by solving the Poisson equation for incompressible ows. The reconstructed pressure uctuations on the airfoil surface constitute the source term for Curle's aeroacoustic analogy, which was employed in both the distributed and compact formulation to estimate the noise emission from PIV. The results of the two formulations are compared with the simultaneous far-eld microphone measurements in the temporal and spectral domains. Both formulations of Curle's analogy yield acoustic sound pressure levels in good agreement with the simultaneous microphone measurements for the tonal component. The estimated far-eld sound power spectra (SPL) from the PIV measurements reproduce the peak at the vortex shedding frequency, which also agrees well with the acoustic measurements.

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Section: Acoustic Prediction With Fov 2-based Compact Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aeroacoustic analysis of an airfoil with Gurney flap based on time-resolved particle image velocimetry measurements

Zhang

Sciacchitano

Pröbsting

2018

Journal of Sound and Vibration

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“…Due to the variety of different applications of PIV and the large number of different possibilities to illuminate, record, and evaluate, many different technical modifications of the PIV technique have been developed (Raffel et al, 2007;Tropea et al, 2007;Lorenzoni et al, 2012). Moreover, most publications (Siddiqui, Nabavi, 2008; Roch, Park, 2003) describe the problems from a specific point of view (e.g.…”

Section: Particle Image Velocimetrymentioning

confidence: 99%

Experimental Acoustic Flow Analysis Inside a Section of an Acoustic Waveguide

Weyna¹,

Mickiewicz²,

Pyla³

et al. 2013

Archives of Acoustics

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Noise propagation within ducts is of practical concern in many areas of industrial processes where a fluid has to be transported in piping systems. The paper presents experimental data and visualization of flow in the vicinity of an abrupt change in cross-section of a circular duct and on obstacles inside where the acoustic wave generates nonlinear separated flow and vortex fields.For noise produced by flow wave of low Mach number, laminar and turbulent flows are studied using experimental sound intensity (SI) and laser particle image velocimetry (PIV) technique adopted to acoustics (A-PIV). The emphasis is put on the development and application of these methods for better understanding of noise generation inside the acoustic ducts with different cross-sections. The intensity distribution inside duct is produced by the action of the sum of modal pressures on the sum of modal particle velocities. However, acoustic field is extremely complicated because pressures in non-propagating (cut-off) modes cooperate with particle velocities in propagating modes, and vice versa. The discrete frequency sound is strongly influenced by the transmission of higher order modes in the duct. By understanding the mechanism of energy in the sound channels and pipes we can find the best solution to noise abatement technology.In the paper, numerous methods of visualization illustrate the vortex flow as an acoustic velocity or sound intensity stream which can be presented graphically. Diffraction and scattering phenomena occurring inside and around the open-end of the acoustic duct are shown.

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“…The experimental setup consists of a rod-airfoil configuration, already used by de Santana [19]. In this arrangement, firstly proposed by Jacob et al [20] as a benchmark problem for noise computation and modeling, the wing profile undergoes a broadband perturbation dominated by a preferred shedding frequency, similarly to what has been observed in most turbo-machinery applications [21]. Indeed, as stated by Roger and Moreau [11], the analysis of the turbulence-impingement noise reduction that can be achieved with the use of porous treatment provides similar results to that of a rod-airfoil and a tandem airfoil configuration.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Airfoil Turbulence-Impingement Noise Reduction Using Porous Treatment

Zamponi

Ragni

Wyer

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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On the use of time-resolved particle image velocimetry for the investigation of rod–airfoil aeroacoustics

Cited by 23 publications

References 38 publications

Aeroacoustic analysis of an airfoil with Gurney flap based on time-resolved particle image velocimetry measurements

Aeroacoustic analysis of an airfoil with Gurney flap based on time-resolved particle image velocimetry measurements

Experimental Acoustic Flow Analysis Inside a Section of an Acoustic Waveguide

Experimental Investigation of Airfoil Turbulence-Impingement Noise Reduction Using Porous Treatment

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