Abstract
The initial responses and evolutions of the flow pattern and lift coefficient of a hydrofoil under the action of electro-magnetic (Lorentz) force have been studied experimentally and numerically, and trace particle methods are employed for them. With the introduction of BVF (boundary vortex flux), the quantitative relation among Lorentz forces, BVF and lifts is deduced. The influences of flow patterns on the hydrofoil lift coefficient have been discussed based on the BVF distribution, and the flow control mechanism of Lorentz force for a hydrofoil has been elucidated. Our results show that the flow pattern and lift of the hydrofoil vary periodically without any force. However, with the action of streamwise Lorentz forces, the separation point on the hydrofoil surface moves backward with a certain velocity, which makes the flow field steady finally. The streamwise Lorentz force raises the foil lift due to the increase of BVF intensity. On the other hand, Lorentz force also increases the hydrofoil surface pressure, which makes the lift decrease. However, the factor leading to the lift enhancement is determinant, therefore, the Lorentz force on the suction side can increase the lift, and the stronger the Lorentz force, the larger the lift enhancement. Our results also show that the localized Lorentz force can also both suppress the flow separation and increase the hydrofoil lift coefficient, furthermore, the Lorentz force located on the tail acts better than that located on the front.
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Prandtl L. Uber Flussigkeitsbewegung bei sehr kleiner Reibung. Verh III Intern Math Kongr, 1904: 484–491
Choi K S. European drag-reduction research-recent developments and current status. Fluid Dyn Res, 2000, 26: 325–335
Tardu S. Active control of near-wall turbulence by local oscillating blowing. J Fluid Mech, 2001, 439: 217–235
Ferrante A, Elghobashi S. On the physical mechanisms of drag reduction in a spatially developing turbulent boundary layer laden with microbubbles. J Fluid Mech, 2004, 503: 345–355
Lee S T, Jang Y G. Control of flow around a NACA0012 airfoil with a nicro-riblet film. J Fluids Struct, 2005, 20: 659–672
Kumar V, Aloi F S. Efficient control of separation using microjets. AIAA-2005-4879
Min T, Yoo J Y, Choi H, et al. Drag reduction by polymer additives in a turbulent channel flow. J Fluid Mech, 2003, 486: 213–238
Gailitis A, Lielausis O. On a possibility to reduce the hydrodynamic resistance of a plate in an electrolyte. Appl Magnetohydrodyn, 1961, 12: 143–146
Henoch C, Stace J. Experimental investigation of a salt water turbulent boundary layer modified by an applied streamwise magnetohydrodynamic body force. Phys Fluids 1995, 7(6): 1371–1383
Breuera K S, Park J. Actuation and control of a turbulent channel flow using Lorentz forces. Phys Fluids, 2004, 16(4): 897–907
Berger W, Kim J, Lee C, et al. Turbulent boundary layer contro utilizing the Lorentz force. Phys Fluids, 2000, 12(3): 631–649
Weier T, Gerbeth G, Mutschke G, et al. Control of flow separation using electromagnetic forces. Flow Turbul Combust, 2003, 71: 5–16
Weier T, Fey U, Gerbeth G, et al. Control of flow separation from a Hydrofoil using Lorentz Forces. In: American Physical Society, Division of Fluid Dynamics Meeting, November 21–23, 1999 New Orleans, LA
Mutschke G, Gerbeth G, Albrecht T, et al. Separation control at hydrofoil using Lorentz forces. Eur J Mech B-Fluid 2006, 25: 137–152
Pang J, Choi K, Aessopos A. Control of near-wall turbulence for drag reduction by spanwise oscillating Lorentz force. AIAA-2004-2117
Kim S, Lee C. Investigation of the flow around a circular cylinder under the influence of an electromagnetic force. Exp Fluids, 2000, 28: 252–260
Zhang H, Fan B C, Chen Z H, et al. Open-loop and optimal control of cylinder wake via electro-magnetic fields. Chin Sci Bull, 2008, 53(19): 2946–2952
Zhou B M, Fan B C, Chen Z H, et al. Flow control effects of electromagnetic force in the boundary layer. Acta Mech Sin, 2004, 36: 472–478
Chen Y H, Fan B C, Chen Z H, et al. Experimental and numerical investigations on the electro-magnetic control of hydrofoil wake. Acta Phys Sin-Ch ED, 2008, 57(2): 648–653
Chen Y H, Fan B C, Zhou B M, et al. Electro-Magnetic Control of Hydrofoil Wake. Acta Mech Sin, 2008, 40(1): 121–127
Rogers S E, Kwak D. Upwind differencing scheme for the time-accurate incompressible Navier-Stokes equations. AIAA J, 1990, 28: 253–262
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Chen, Y., Fan, B., Chen, Z. et al. Flow pattern and lift evolution of hydrofoil with control of electro-magnetic forces. Sci. China Ser. G-Phys. Mech. Astron. 52, 1364–1374 (2009). https://doi.org/10.1007/s11433-009-0172-4
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DOI: https://doi.org/10.1007/s11433-009-0172-4