A two-dimensional vortex model for vertical axis wind turbines

• Autorzy: Dumitrescu H. , Cardos V.
• Języki publikacji: EN

Abstrakty

EN

The present paper compares the aerodynamic loads predicted by a vortex model with wind tunnel measurements for a straight-bladed Darrieus rotor. A computation unsteady discrete-vortex method, based on lifting line theory and a free vortex wake model, is used. Thus the wake is composed of shedding spanwise discrete vortices, whose strengths are equal to the change in the bound vortex strength as dictated by Kelvin's theorem and performance parameters are calculated by application of the Biot-Savart law along with the Kutta-Joukovski theorem. The popular Beddoes-Leishman dynamic-stall model is incorporated in the method and a better approach is obtained. The transient normal and tangential-force coefficients predicted with dynamic-stall effects are compared with wind tunnel data for one and two NACA 0018 straight-bladed rotors. The results are given for a rotor with a large solidity (chord-to-radius of 0.20) at two tip-speed ratios ('lambda' = 1.5 and 3.0) and at a low Reynolds number of 3.8*104. The comparisons between experimental data and theoretical results show the predictions by the marching-vortex method to be more accurate than those estimated by a code based on streamtube theory.

Słowa kluczowe

EN

aerodynamics; unsteady flows; vortex methods; dynamic stall; wind turbines

PL

aerodynamika; turbina wiatrowa; metoda wirowa

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, no 4
• Strony: 1173--1187
• Opis fizyczny: Bibliogr. 12 poz., rys., tab., wykr.

Twórcy

autor

Dumitrescu H.

• "Caius Iacob" Institute of Applied Mathematics P.O. Box 1-24, RO-70700, Bucharest, ROMANIA

autor

Cardos V.

• "Caius Iacob" Institute of Applied Mathematics P.O. Box 1-24, RO-70700, Bucharest, ROMANIA

Bibliografia

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• [3] Dumitrescu H. and Cardoę V. (2000): Two computation methods for oscillatory airfoils. - Applied Mechanics and Engineering, vol.5, No.3, pp.593-611.
• [4] Eppler R. (1990): Airfoil Design and Data. - Berlin-New York: Springer-Verlag.
• [5] Ericson L.E. and Reding J.P. (1978): Engineering analysis of dynamic stall. - Proceedings of the ASME Winter Annual Meeting, San Francisco, California, pp.l 17-123.
• [6] McCroskey J.W. and Pucci L.S. (1982): Viscous-inviscid interaction on oscillating airfoils in subsonic flow. - AIAA Journal, vol.20, No.2, pp. 167-174.
• [7] Nguyen V.D., Vittecoq P., Bourassa P. and Mercadier Y. (1981): Etude en soufflerie d'un rotor de type Darrieus. - Mechanical Engineering Department, University of Sherbrooke, Canada, Report No.MEC-81-2.
• [8] Paraschivoiu I. (1982): Aerodynamic loads and performance of the Darrieus rotor. - Journal of Energy, vol.6, No.6, pp.406-412.
• [9] Paraschivoiu I. (1988): Double-multiple streamtube model for studying vertical-axis wind turbines. - Journal of Propulsion and Power, vol.4, No.4, pp.370-378.
• [10] Strickland J.H., Smith T. and Sun K. (1981): A vortex model of the Darrieus turbine: An analytical and experimental study. - Sandia National Laboratories, Albuquerque, New Mexico, SAND81-7017.
• [11] Touryan K.J., Strickland J.H. and Berg D.E. (1987): Electric power from vertical-axis wind turbines. - Journal of Propulsion and Power, vol.3, No.6, pp.481-493.
• [12] Vittecoq P. and Laneville A. (1982): Etude en soufflerie d'un rotor de type Darrieus. - Mechanical Engineering Departement, University of Sherbrooke, Canada, Report No.MEC-82-2.