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Your search keyword '"Dumitrache, Alexandru"' showing total 7 results
Start Over Author "Dumitrache, Alexandru" Topic numerical analysis
7 results on '"Dumitrache, Alexandru"'

2. Numerical Investigations on Dynamic Stall Control with Passive Elements.

Author

Frunzulica, Florin, Dumitrache, Alexandru, and Suatean, Bogdan

Subjects
*PASSIVE components, *VERTICAL axis wind turbines, *REYNOLDS number, *TURBULENCE, *AEROFOILS, *NUMERICAL analysis
Abstract

In this paper we investigated numerically the possibilities to control the dynamic stall phenomenon, with application to vertical axis wind turbines (VAWT). The dynamic stall appears at low tip speed ratio (TSR<4) and it has a great impact on structural integrity of the wind turbine and power performances. For this reason we performed a computational analysis of the dynamic stall phenomenon around NACA 0012 airfoil equipped with passive flow control device, in pitching motion at relative low Reynolds number (~105). Two passive flow control devices have been numerically investigated: turbulence promoter mounted on the leading edge and step on the upper surface of the airfoil. For the present studies, unsteady Reynolds averaged Navier-Stokes (RANS) model is the suitable approach to perform the dynamic stall simulations with an acceptable computational cost and reasonable accuracy. The results are compared to those of an existing experimental case test for unmodified NACA 0012 airfoil. [ABSTRACT FROM AUTHOR]

Published
2015
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5. Blowing jets as a circulation flow control to enhancement the lift of wing or generated power of wind turbine.

Author

DUMITRACHE, Alexandru, FRUNZULICA, Florin, DUMITRESCU, Horia, and CARDOS, Vladimir

Subjects
*AEROFOILS, *AIRPLANE design, *COANDA effect, *AIRPLANE wings, *WIND turbines, *NUMERICAL analysis
Abstract

The goal of this paper is to provide a numerical flow analysis based on RANS equations in two directions: the study of augmented high-lift system for a cross-section airfoil of a wing up to transonic regime and the circulation control implemented by tangentially blowing jet over a highly curved surface due to Coanda effect on a rotor blade for a wind turbine. This study were analyzed the performance, sensitivities and limitations of the circulation control method based on blowing jet for a fixed wing as well as for a rotating wing. Directions of future research are identified and discussed. [ABSTRACT FROM AUTHOR]

Published
2014
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7. Symposium on Mathematical Modeling and Numerical Analysis of Aerodynamic, Aeroelasticity and Noise for Wind Turbines.

Author

Dumitrache, Alexandru and Frunzulica, Lorin

Subjects
*CONFERENCES & conventions, *WIND turbines, *NUMERICAL analysis, *AEROELASTICITY, *AERODYNAMICS
Abstract

Information about a symposium on Mathematical Modeling and Numerical Analysis of Aerodynamic, Aeroelasticity and Noise for Wind Turbines is presented. Topics include the estimation of wind turbine performance, optimization of wind turbines, and the blade-tower coupling effect. The event also highlighted the design, aerodynamic and aeroelasticity characteristics estimation, and performance prediction of wind turbine using mathematical modelling and numerical analysis.

Published
2010
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