Acoustic radiation and surface pressure characteristics of an airfoil due to incident turbulence

Paterson, R. W.

doi:10.2514/6.1976-571

Cited by 124 publications

(110 citation statements)

References 16 publications

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“…The intensity now becomes ref(Prelc) /og 1 (0llO) (13) and thus the power for each incremental area is now…”

Section: Section II Development Of Methodology To Determine Total Radmentioning

confidence: 99%

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Airframe Aerodynamic Noise- Total Radiated Acoustic Power Approach

Shaw¹

1978

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“…The intensity now becomes ref(Prelc) /og 1 (0llO) (13) and thus the power for each incremental area is now…”

Section: Section II Development Of Methodology To Determine Total Radmentioning

confidence: 99%

“…Finally, the measured frequencies ahead of and behind the source can be corrected for the Doppler shift using this expression for M in equations 30 and 31. re1 13 The Doppler effect on the amplitude must also be considered. Normally this effect is small and is neglected.…”

Section: Section II Development Of Methodology To Determine Total Radmentioning

confidence: 99%

Airframe Aerodynamic Noise- Total Radiated Acoustic Power Approach

Shaw¹

1978

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“…(2) is compared in Fig. 2 against the incompressible low-frequency transfer function provided by Sears (1941) and the compressible high-frequency transfer function from Paterson and Amiet (1976). The asymptotic value of the magnitude of Eq.…”

Section: Analytical Calculation Of Broadband Interaction Noisementioning

confidence: 99%

“…Usually two iterations of the Schwarzschild's technique are used for calculating the high-frequency solution, which leads to a correct prediction at moderate and high frequencies, but overestimates the response of compact sources at low frequencies (see e.g. Paterson and Amiet (1976), Roger et al (2006) and Reboul (2010)). Recently Santana et al (2016) extended Amiet's high-frequency theory with additional iterations of the Schwarzschild's technique in order to improve the solutions for low frequencies.…”

Section: Analytical Calculation Of Broadband Interaction Noisementioning

confidence: 99%

Impact of Turbulence Models on RANS-Informed Prediction of Fan Broadband Interaction Noise

Jaron

Herthum

Franke

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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In the present study turbulence characteristics from Reynolds Averaged Navier-Stokes simulations are used as input for the analytical prediction of fan broadband noise due to the interaction of the fan rotor wake turbulence with the outlet guide vanes. The aerodynamic excitation is modeled with a von Kármán spectrum and the blade response with the Sears function extended with a term considering the non-compactness of the source. The influence of different turbulence models, from state-of-the-art two-equation models to a Reynoldsstress transport model, on the simulated turbulence characteristics and consequently on the broadband noise prediction is investigated. Furthermore the impact of the two-equation model extensions for the effects of rotation, transition and the stagnation point is analyzed and discussed. The predicted noise spectra are compared to the experimental test data of the NASA Source Diagnostic Test fan rig. It has been found that different turbulence models and extensions can lead to a variation of predicted broadband interaction noise of up to 2 dB.

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“…Equation (4) is constructed by heuristic argument so that it is consistent with equation (3a) and also with the equations derived in references 1 and 2 for homogeneous turbulent flow over small -to-large chord airfoils. For homogeneous tu: bulence, equations (3a) and (4) transform to the equations listed in table I, which include the scrubbed area of the airfoil (K).…”

Section: Estimate Of the Acoustic Characteristicsmentioning

confidence: 99%