Search

Your search keyword '"Guo Guangxing"' showing total 20 results
Start Over Author "Guo Guangxing"
20 results on '"Guo Guangxing"'

10. Method for persistent topological features extraction of schizophrenia patients’ electroencephalography signal based on persistent homology

Author

Guo, Guangxing, primary, Zhao, Yanli, additional, Liu, Chenxu, additional, Fu, Yongcan, additional, Xi, Xinhua, additional, Jin, Lizhong, additional, Shi, Dongli, additional, Wang, Lin, additional, Duan, Yonghong, additional, Huang, Jie, additional, Tan, Shuping, additional, and Yin, Guimei, additional

Published
2022
Full Text
View/download PDF

13. Numerical Study on Flow and Noise Characteristics of an NACA0018 Airfoil with a Porous Trailing Edge.

Author

Zhu, Weijun, Liu, Jiaying, Sun, Zhenye, Cao, Jiufa, Guo, Guangxing, and Shen, Wenzhong

Abstract

An airfoil with a porous trailing edge has a low noise emission; thus, using a porous medium is a good technique for further reduction of wind turbine noise. In this paper, to reduce airfoil trailing edge noise while minimizing the negative influence of a porous medium on aerodynamic performance, a new filling method is proposed such that a porous medium is only used in the suction side half of the trailing edge, which is more sensitive to the noise generation. The large eddy simulation (LES) technique for flow and the Ffowcs Williams and Hawkings (FW-H) method for acoustics are used. At a Reynolds number of 2.63 × 105 and various angles of attack, an NACA0018 airfoil profile with a porous trailing edge covering 20% of the chord is studied under two porous configurations, namely a fully porous and a suction-side porous trailing edge type. The results show that the flow direction, velocity magnitude, and their distributions along the boundary layer of the two porous airfoils are significantly modified due to the presence of the porous medium. The fluctuation of the pressure coefficient and the increase in the boundary layer thickness are significant at low angles of attack. As compared to the solid airfoil counterpart, the noise radiation from the newly proposed suction-side porous airfoil achieves a noise reduction of 4.3 dB at an angle of attack α = 0°, and a noise reduction of 4.07 dB at an angle of attack α = 2°. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

15. Experimental investigation of a pitch-oscillating wind turbine airfoil with vortex generators

Author

Jin Xu, Shuang Li, Ke Yang, Song Juanjuan, Lei Zhang, and Guo Guangxing

Subjects
Physics, Airfoil, Leading edge, Turbine blade, Renewable Energy, Sustainability and the Environment, 020209 energy, 020208 electrical & electronic engineering, Stall (fluid mechanics), 02 engineering and technology, Mechanics, Vortex generator, law.invention, Adverse pressure gradient, Flow separation, law, 0202 electrical engineering, electronic engineering, information engineering, Wind tunnel
Abstract

The inflow shear and turbulence, tilt or yaw misalignment, and tower passage lead to dynamic stall on turbine blades. The effects of vortex generators (VGs) on the aerodynamic performance of a typical wind turbine airfoil, namely, DU91-W2-250, are measured under the background that VGs are gradually and widely installed for energy improvement. The experiment is carried out in a wind tunnel at the Reynolds number of 3 × 10 5. The oscillation of the testing model is driven by a servo motor, and the aerodynamic performance is measured using an ESP-64 scanner. The flow separation is visualized with tufts. The obtained results show that the installation of the VGs could effectively control both static stall and dynamic stall of the airfoil because VGs cause a lower pressure region on the airfoil suction surface near the leading edge and a pressure plateau that appears later than in the smooth airfoil. Meanwhile, the VGs could effectively increase the adverse pressure gradient and lead to an early transition to delay the flow separation before stall and force the flow field in the turbulence state. It is also found that the VGs could reduce the pressure fluctuations caused by the turbulence of the boundary layer during dynamic stall. Furthermore, the VGs are also found to be useful in suppressing the span-wise movement of vortices. However, the VGs could not improve the aerodynamic performance in the deep stall region under none of the static and dynamic conditions.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results