Trailing-Edge Noise Measurements Using a Hot-Wire Based Coherent Particle Velocity Method

Herrig, Andreas; Wuerz, Werner; Lutz, Thorsten; Kraemer, Ewald

doi:10.2514/6.2006-3876

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…It has been observed, that the noise level predicted by the original TNO-Blake model (i.e., Eqn. (3)) almost always showed −8 to − 10 dB offset compared to experimental results 4,19 . In the present study, an extensive step by step assessment and validation of the original TNO-Blake model is conducted based on new measurement data, namely two-point correlations, WPF and far-field TE noise spectrum.…”

Section: Modified Formulation Of the Tno-blake Modelmentioning

confidence: 43%

“…The hot-wire based Coherent Particle Velocity (CPV) method [27][28][29] was employed for measurements of trailing edge noise on exactly the same airfoil section in the same wind tunnel. Two 45 deg slanted hot-wires (Dantec P12 probes, diameter 2.5 µm ϫ 1.4 mm wires) are placed on both sides of the airfoil in the cross sectional plane upstream of the TE, at a distance being much larger than the boundary layer thickness.…”

Section: Acoustic Cpv Measurementsmentioning

confidence: 99%

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Comprehensive evaluation and assessment of trailing edge noise prediction based on dedicated measurements

Kamruzzaman¹,

Herrig²,

Krämer³

et al. 2011

Noise Control Eng. J.

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An extensive assessment and step by step validation of turbulent boundary-layer trailing-edge interaction (TBL-TE) noise prediction was conducted based on the boundary layer properties calculated by three different aerodynamics methods, XFOIL, Wilcox EDDYBL and the RANS solver FLOWer. For this purpose detailed measurements of turbulent boundary-layer properties like two-point turbulent velocity correlations, the spectrum of the associated wall pressure fluctuations (WPFs) and the emitted trailing-edge noise have been performed in the Laminar Wind Tunnel (LWT). The measurements were performed for the NACA 0012 airfoil. Most of the investigated cases show that the numerical WPF and far-field radiated noise models capture the measured peak amplitude level as well as the peak position remarkably well, if the turbulence noise source parameters are estimated properly including turbulence anisotropy effects. © 2011 Institute of Noise Control Engineering.

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Section: Modified Formulation Of the Tno-blake Modelmentioning

confidence: 43%

Section: Acoustic Cpv Measurementsmentioning

confidence: 99%

Comprehensive evaluation and assessment of trailing edge noise prediction based on dedicated measurements

Kamruzzaman¹,

Herrig²,

Krämer³

et al. 2011

Noise Control Eng. J.

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“…A short overview about all these measurements are given. For detail information about the experimental set‐up and procedure, see Herrig, Herrig et al and Kamruzzaman et al Experimental studies of the general aerodynamic properties such as polars, c p distributions and integral BL parameters have also been conducted. Detailed discussions and validations of this measurement data can be seen in Würz et al and Kamruzzaman et al and are out of the scope of the present study.…”

Section: Experimental Set‐upmentioning

confidence: 99%

“…Very similar to the coherent power method (COP) method as used by Hutcheson and Brooks, a hot‐wire‐based coherent particle velocity method has been developed at the LWT for the TBL induced TE noise measurement. Two 45° slanted hot wires (Dantec P12 probes, ø2.5 μm ×1.4mm wires) are placed on both sides of the airfoil in the cross‐sectional plane upstream of the TE, at a distance being much larger than the boundary‐layer thickness.…”

Section: Experimental Set‐upmentioning

confidence: 99%

Validations and improvements of airfoil trailing‐edge noise prediction models using detailed experimental data

et al. 2011

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This paper describes an extensive assessment and a step by step validation of different turbulent boundary‐layer trailing‐edge noise prediction schemes developed within the European Union funded wind energy project UpWind. To validate prediction models, measurements of turbulent boundary‐layer properties such as two‐point turbulent velocity correlations, the spectra of the associated wall pressure fluctuations and the emitted trailing‐edge far‐field noise were performed in the laminar wind tunnel of the Institute of Aerodynamics and Gas Dynamics, University of Stuttgart. The measurements were carried out for a NACA 643‐418 airfoil, at Re = 2.5 ×106, angle of attack of −6° to 6°. Numerical results of different prediction schemes are extensively validated and discussed elaborately. The investigations on the TNO‐Blake noise prediction model show that the numerical wall pressure fluctuation and far‐field radiated noise models capture well the measured peak amplitude level as well as the peak position if the turbulence noise source parameters are estimated properly including turbulence anisotropy effects. Large eddy simulation based computational aeroacoustic computations show good agreements with measurements in the frequency region higher than 1 kHz, whereas they over‐predict the sound pressure level in the low‐frequency region. Copyright © 2011 John Wiley & Sons, Ltd.

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“…Far-field noise was estimated based on the coherent particle velocity at two hot wire probes in order to reject background noise in the closed tunnel. 16 These measurements, led to the conclusion that the original assumption of local isotropy in the turbulent boundary layer was incorrect and the TNO-Blake model was further modified to include anisotropy in which the turbulence intensity and integral length-scale were allowed to be different in the three orthogonal directions. 13 Anisotropy was introduction through the introduction of 'stretching' coefficients in order to vary the ratios between streamwise and transverse mean square velocities and lengthscales.…”

mentioning

confidence: 99%

Prediction of Broadband Trailing-Edge Noise Based on Blake Model and Amiet Theory

Stalnov

Paruchuri

Joseph

2015

21st AIAA/CEAS Aeroacoustics Conference

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This paper extends previously published TNO-Blake methods to predict airfoil broadband self-noise due to interaction of a turbulent boundary-layer with a sharp trailing edge. The method presented herein combines Blake's model to predict surface pressure fluctuations and Amiet model to predict trailing edge noise emission. The Blake method is based on the solution of the Poisson equation as an integral of the mean-shear turbulent source interaction source, over the entire boundary layer thickness. A recent advances in description of streamwise turbulent intensity are employed. Surface pressure spectra are measured with remote microphones and compared to the prediction. In the next step, the wavenumberfrequency spectrum as predicted by the TNO model was utilized as an input to the Amiet model to evaluate the far-field trailing edge noise.

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Trailing-Edge Noise Measurements Using a Hot-Wire Based Coherent Particle Velocity Method

Cited by 16 publications

References 10 publications

Comprehensive evaluation and assessment of trailing edge noise prediction based on dedicated measurements

Comprehensive evaluation and assessment of trailing edge noise prediction based on dedicated measurements

Validations and improvements of airfoil trailing‐edge noise prediction models using detailed experimental data

Prediction of Broadband Trailing-Edge Noise Based on Blake Model and Amiet Theory

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