Search

Research and elaboration of the systems for conversion of renewable energy sources (RES) as a research objective present great interest and importance. Wind and hydraulic energy currently are the most used, cheap and clean renewable energy sources. The main goal of this paper consists in the mathematical modeling of the aero/hydrodynamic profiles of blades and individualized orientation of the hydrodynamic blades. Using a high order panel method, the potential flow analysis is performed in order to compute the hydrodynamic lift and moment coefficients. The drag coefficient is computed through a boundary layer analysis. Increased efficiency is achieved by an optimum position of the blades with hydrodynamic profile. In order to increase the lift and reduce the drag forces for a blade segment with aerodynamic profile, a groove was created on its surface. The optimum location of the groove was determined by means of CFD analysis. Simulation results were compared to test results and the CFD analysis model was validated. A new design and functional concept of a wind and hydraulic flow turbine with orientation of the hydrodynamic blades was proposed and elaborated. [ABSTRACT FROM AUTHOR]

International research confirms that the emission of greenhouse gases is substantially lower in the case of hydropower compared to that generated by burning fossil fuels. The analysis of the constructive diversion of micro hydroelectric power plants, examined previously, does not satisfy completely from the point of view of water kinetic energy conversion efficiency. In order to increase the conversion factor of water kinetic energy (Betz coefficient), a number of structural diagrams of floatable micro hydro power plants has been developed and patented. The micro hydropower plants comprise a rotor with vertical axis and vertical blades with hydrodynamic profile in normal section. The blades are connected by an orientation mechanism towards the water streams direction. [ABSTRACT FROM AUTHOR]