Aerodynamic and Aeroacoustic Properties of Flatback Airfoils

Berg, Dale E.; Zayas, Jose R.

doi:10.2514/6.2008-1455

Cited by 20 publications

(9 citation statements)

References 3 publications

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“…Researchers at Sandia National Laboratories are investigating the performance of BSDS blades. Wind tunnel tests have shown a strong low frequency noise signature caused by the inboard "flatback" blunt trailing edge section 13 . The 17.9 meter diameter A American Institute of Aeronautics and Astronautics 3 blade set is being monitored in operation on a 100 kW turbine for its acoustic properties, especially those of the flatback section.…”

Section: Introductionmentioning

confidence: 99%

Aeroacoustic Noise Measurements of a Wind Turbine with BSDS Blades Using an Acoustic Array

Simley

Moriarty

Palo

2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Section: Introductionmentioning

confidence: 99%

Aeroacoustic Noise Measurements of a Wind Turbine with BSDS Blades Using an Acoustic Array

Simley

Moriarty

Palo

2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…A previous paper has described the test facility, the models, and the test methodology, and provided some preliminary results from the test 8 . This paper will present a snapshot of some of the aerodynamic and aeroacoustic results from that test.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic and Aeroacoustic Properties of a Flatback Airfoil: An Update

Barone

Berg

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Abstract:The blade design resulting from the Sandia National Laboratories (SNL) Blade Systems Design Study, known as the BSDS blade, utilizes "flatback" airfoils for the inboard section of the blade to achieve a lighter, stronger blade. Compared to a thick conventional, sharp trailing-edge airfoil, a flatback airfoil with the same thickness exhibits increased lift and reduced sensitivity to soiling. In order to quantify the aerodynamic and noise generation characteristics of flatback airfoils, Sandia National Laboratories has conducted a wind tunnel test to measure the noise generation and aerodynamic performance characteristics of a regular DU97-W-300 airfoil, a 10% trailing edge thickness flatback version of that airfoil, and the flatback fitted with a trailing edge treatment. Limited results from the test are presented. The flatback generates considerably more sound than the sharp trailing edge airfoil, but that sound is significantly reduced by the addition of a simple splitter plate to the flatback trailing edge. The data are shown to be consistent with prior aerodynamic tests on the sharp trailing edge configuration and with prior aeroacoustic tests on blunt trailing edge airfoils.

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“…Also, some researches were attempted to reduce this tonal noise. In an experimental studies of flatback airfoils, Berg and Zayas [31] designed a flatback root blade section with a thickness to chord length ratio of 0.1 and performed aerodynamic and acoustic tests in a wind tunnel. Kim et al [32,33] performed numerical simulation of flatback airfoil aerodynamic noise using hybrid RANS-LES and acoustic analogy.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Unsymmetric Flatbak Trailing Edge Airfoil to Reduce Turbomachinery Noise in Power Generation Cycle

Kim¹,

T²,

S³

et al. 2017

Preprint

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Abstract:A turbomachinery is essential part in the power generation cycle. But, it is main noise source to annoy workers and users and to make environmental problem. Thus it is important to reduce this noise for operating the power generation cycle. This noise is created by flow instability on rotor blade trailing edge. An airfoil that becomes a section of a rotor blade of a rotating machine is manufactured as a blunt trailing edge (TE) with a round or flatback shape rather than the ideal sharp TE shape for the purposes of producibility and durability. This increases the tonal noise and flow-induced vibration at low frequency owing to vortex shedding behind TE when compared with a sharp TE. In order to overcome this problem, this study investigates the oblique TE shape using numerical simulation. In order to do so, the flow was simulated using large eddy simulation (LES) and the noise was analysed by acoustic analogy coupled with LES result. Once the simulation results were verified using the flatback airfoil measurements of Sandia National Laboratories, numerical prediction was performed for airfoils modified to have oblique trailing edge angles of 60°, 45°, and 30° to analyse the flow and noise characteristics. From the simulation results for an airfoil having an oblique TE, it could be seen that the vortex shedding frequency moves in accordance with the oblique angle and that the vortex shedding noise characteristics change according to this angle when compared to the flatback TE airfoil. Therefore, it is considered that modifying the flatback TE airfoil to have an appropriate oblique angle can reduce noise and change the tonal frequency to a bandwidth that is suitable for mechanical systems.

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Aerodynamic and Aeroacoustic Properties of Flatback Airfoils

Cited by 20 publications

References 3 publications

Aeroacoustic Noise Measurements of a Wind Turbine with BSDS Blades Using an Acoustic Array

Aeroacoustic Noise Measurements of a Wind Turbine with BSDS Blades Using an Acoustic Array

Aerodynamic and Aeroacoustic Properties of a Flatback Airfoil: An Update

Numerical Analysis of Unsymmetric Flatbak Trailing Edge Airfoil to Reduce Turbomachinery Noise in Power Generation Cycle

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