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Full Length Article | Open Access

Unsteady aerodynamic noise prediction of contra-rotating open rotor using meshless method

Zhiliang HONGa, Meng SUa, Haitao ZHANGb, Zerui XUa, Lin DUc, Lingfeng CHENa,( )
College of Safety Science and Engineering, Civil Aviation University of China, Tianjin 300300, China
Civil Aviation Administration of China, Beijing 100710, China
Research Institute of Aero-Engine, Beihang University, Beijing 100191, China

Peer review under responsibility of Editorial Committee of CJA.

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Abstract

The Contra-Rotating Open Rotor (CROR) design confronts significant noise challenges despite being one of the possible options for future green aeroengines. To efficiently estimate the noise emitted from a CROR, a three-dimensional unsteady prediction model based on the meshless method is presented. The unsteady wake flow and the aerodynamic load fluctuations on the blade are solved through the viscous vortex particle method, the blade element momentum theory and vortex lattice method. Then, the acoustic field is obtained through the Farassat’s formulation 1A. Validation of this method is conducted on a CROR, and a mesh-based method, e.g., Nonlinear Harmonic (NLH) method, is also employed for comparison. It is found that the presented method is three times faster than NLH method while maintaining a comparable precision. A thorough parametric analysis is also carried out to illustrate the effects of rotational speed, rotor-rotor spacing and rear rotor diameter on the noise level. The rotor speed is found to be the most influencing factor, and by optimizing the speed difference between the front and rear rotors, a notable noise reduction can be expected. The current findings not only contribute to a deeper comprehension of the CROR’s aeroacoustic properties but also offer an effective tool for engineering applications.

Keywords

Aerodynamic noiseBlade element momentum theoryContra-Rotating Open Rotor(CROR)Viscosity vortex particle methodFarassat’s formulation 1A

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Chinese Journal of Aeronautics
Volume 37 Issue 8,
August 2024
Pages 144-165
DOI: 10.1016/j.cja.2024.05.018
Cite this article:
HONG Z, SU M, ZHANG H, et al. Unsteady aerodynamic noise prediction of contra-rotating open rotor using meshless method. Chinese Journal of Aeronautics, 2024, 37(8): 144-165. https://doi.org/10.1016/j.cja.2024.05.018

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Received: 14 September 2023
Revised: 08 October 2023
Accepted: 17 November 2023
Published: 23 May 2024
© 2024 Chinese Society of Aeronautics and Astronautics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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