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Energies 2017, 10(7), 872; https://doi.org/10.3390/en10070872

Numerical Analysis of Flatback Trailing Edge Airfoil to Reduce Noise in Power Generation Cycle

1
Energy Efficiency and Materials Research Division, Korea Institute of Energy Research, Daejeon 305-343, Korea
2
Siemens Industry Software Ltd., Seoul 08502, Korea
3
Hyundai Heavy Industries Co. Ltd., Seoul 03058, Korea
4
Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Leonardo P. Chamorro
Received: 11 April 2017 / Revised: 18 June 2017 / Accepted: 22 June 2017 / Published: 29 June 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
Full-Text   |   PDF [10519 KB, uploaded 29 June 2017]   |  

Abstract

Turbo machinery is an essential part in the power generation cycle. However, it is the main source of noise that annoys workers and users, and contributes to environmental problems. Thus, it is important to reduce this noise when operating the power generation cycle. This noise is created by a flow instability on the trailing edge of the rotor blade—an airfoil that becomes a section of the rotor blade of the rotating machine—manufactured as a blunt trailing edge (T.E.), with a round or flatback shape, rather than the ideal sharp T.E. shape, for the purposes of production and durability. This increases the tonal noise and flow-induced vibrations at a low frequency, owing to vortex shedding behind T.E. when compared with a sharp T.E. In order to overcome this problem, the present study investigates the oblique T.E. shape using numerical simulations. In order to do so, flow was simulated using large eddy simulation (LES) and the noise was analyzed by acoustic analogy coupled with the LES result. Once the simulation results were verified using the flatback airfoil measurements of the Sandia National Laboratories, numerical prediction was performed to analyze the flow and the noise characteristics for the airfoils, which were modified to have oblique trailing edge angles of 60°, 45°, and 30°. From the simulation results of the oblique T.E. airfoil, 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 the angle, when compared to the flatback T.E. airfoil. Therefore, it is considered that modifying the flatback T.E. airfoil with an appropriate oblique angle can reduce noise and change the tonal frequency to a bandwidth that is suitable for mechanical systems. View Full-Text
Keywords: power generation cycle; turbo machinery; turbine; compressor; blade; airfoil; noise power generation cycle; turbo machinery; turbine; compressor; blade; airfoil; noise
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shin, H.; Kim, H.; Kim, T.; Kim, S.-H.; Lee, S.; Baik, Y.-J.; Lee, G. Numerical Analysis of Flatback Trailing Edge Airfoil to Reduce Noise in Power Generation Cycle. Energies 2017, 10, 872.

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