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Influences of leading-edge tubercle Amplitude on Airfoil Flow Field

Journal of Thermal Science 2023年第4期32卷 1335-1344页

作者： ZHAO Ming WEI Tong ZHAO Yijia LIU Zhengxian Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin300350China Tianjin Key Laboratory of Modern Engineering Mechanics Tianjin UniversityTianjin300350China

The influences of leading-edge tubercle amplitude on airfoil flow field have been analyzed at high angle of *** accuracy of a large eddy simulation(LES)research is validated through quantitative comparisons with corresponding experimental ***,a proper orthogonal decomposition(POD)analysis has been carried out based on the unsteady flow field and the fluid mechanisms of corresponding POD modes have been ***,the influences of leading-edge tubercle amplitude have been *** the streamwise vorticity is larger than that of small amplitude cases,the momentum transfer process at peaks is more obvious for large amplitude,leading to delayed flow *** amplitude and wavelength play important roles in the generation of laminar separation bubble(LSB)at ***,the Karman vortex shedding process takes place at specific trough sections as pairs of periodic spatial structures exist in the dominant POD *** destruction of Karman vortex shedding process is strengthened along with the increase of amplitude.

关键词： leading-edge tubercle airfoil flow field proper orthogonal decomposition

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Hydrodynamic Performance of leading-edge tubercle Three-Dimensional Airfoil

Hydrodynamic Performance of Leading-Edge Tubercle Three-Dime...

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2012 International Conference on Mechanical Engineering and Materials(ICMEM 2012)

作者： FengFeng Xiangru Cheng Xiangyang Qi Xin Chang College of Shipbuilding Engineering Harbin Engineering University

Based on RANS method, this paper studied leading-edge tubercle three-dimensional airfoil, which had effect on hydrodynamic performance of three-dimensional airfoil. Both section configurations of the two three-dimensional airfoil models were NACA0020 airfoil. The research method was numerical simulation. First, the leading-edge profile of the first airfoil model was normal. To get stalling angle of the first model, it analyzed hydrodynamic performance of the first model under differeRe=1×5nt angle of attacks at.3510. Then, the second model had a sinusoidal leading-edge profile. The second model chose the same Reynolds number. By comparison the numerical calculation results between the first and the second model, the stalling angle of second model delays 3°than the normal airfoil, and the lift coefficient of the second model increases 11.92% than the normal model. The results have laid the foundation for optimization design of leading-edge tubercle three-dimensional airfoil.

关键词： leading-edge tubercle three-dimensional airfoil hydrodynamic performance stalling angle

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Utilization of Whale-inspired leading-edge tubercles for Airfoil Noise Reduction

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Journal of Bionic Engineering 2022年第5期19卷 1405-1421页

作者： Weijie Chen Liangji Zhang Liangfeng Wang Zuojun Wei Weiyang Qiao School of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China China Aerodynamics Research and Development Center High Speed Aerodynamic InstituteMianyang 621000China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China

Numerical studies are conducted to explore the noise reduction effect of leading-edge tubercles inspired by humpback whale *** eddy simulations are performed to solve the flow field,while the acoustic analogy theory is used for noise *** this paper,a baseline airfoil with a straight leading-edge and three bionic airfoils with tubercled leading-edges are *** tubercles have sinusoidal profiles and the profiles are determined by the tubercle wavelength and *** tubercles used in this study have a fixed wavelength of 0.1c with three different amplitudes of 0.1c,0.15c and 0.2c,where c is the mean chord of the *** freestream velocity is set to 40 m/s and the chord based Reynolds number is 400,*** predicted flow field and acoustic field of the baseline airfoil are compared against the experiments and good agreements are found.A considerable noise reduction level is achieved by the leading-edge tubercles and the tubercle with larger amplitude can obtain better noise *** underlying flow mechanisms responsible for the noise reduction are analyzed in detail.

关键词： Bionic design Humpback whale leading-edge tubercle Large eddy simulation Noise reduction mechanism

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