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

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

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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 para-metric 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 fac-tor,and by optimizing the speed difference between the front and rear rotors,a notable noise reduc-tion 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.

Contra-Rotating Open Rotor(CROR)Aerodynamic noiseBlade element momentum theoryViscosity vortex particle methodFarassat's formulation 1A

Zhiliang HONG、Meng SU、Haitao ZHANG、Zerui XU、Lin DU、Lingfeng CHEN

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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

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities,ChinaFundamental Research Funds for the Central Universities,ChinaFundamental Research Funds for the Central Universities,China

5227604552206062312201917131220210873122022QD06

2024

10.1016/j.cja.2024.05.018

中国航空学报(英文版)
中国航空学会

中国航空学报(英文版)

CSTPCDEI
影响因子：0.847
ISSN：1000-9361
年,卷(期)：2024.37(8)
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