The effect of particles on the separation flow around airfoil in dusty environment

Abstract

Abstract: A delayed detached eddy simulation method is employed for the numerical simulation of flows around NREL S809 3D airfoil in clean air and various dusty environment with particles of different diameters. The effect of particle on the flow separation of airfoil was studied. It is shown that at an attacking angle of 8°, DDES has demonstrated the eddy shedding on the suction surface of the airfoil, and addition of particles significantly changes the regularity of eddy shedding on the suction surface of the airfoil, thus enlarging the range of the rear eddy and dissipating it faster. However, with the increase of particle diameter, the tail eddy gradually returns to the state closer to that of clean air. When the attacking angle is less than 6°, there is no flow separation on the surface of the airfoil, and the particles have little effect on the flow region. When the attacking angle is greater than 12°, the particles have even more little effect on the flow around the airfoil. Particles at different attacking angles have different effects on lift factor of the wing. The analysis of the effect of particles on the flow separation on the airfoil surface at different attacking angles shows that the attacking angle most affected seriously by particles is between 7°to 10°.

Key words: wind turbine, airfoil, dusty environment, flow separation, numerical simulation

CLC Number:

TK83

LI Ren-nian, ZHAO Zhen-xi, LI De-shun, LI Yin-ran, WANG Ya-e, GUO Xing-duo. The effect of particles on the separation flow around airfoil in dusty environment[J]. Journal of Lanzhou University of Technology, 2020, 46(4): 62-66.

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