Wind Turbine with Asymmetrical Airodynamic Profile Blades 

Description:
Small wind power stations (<100kW) are utilized mainly for the satisfaction of energy needs of decentralized consumers. The suggested wind station functions on the basis of the utilization of the aerodynamic effect developed by three blades with asymmetrical aerodynamic profile (fig. 1). In the result of the performed computer simulation and laboratory experimental research the three-blade rotor with asymmetrical aerodynamic profile was designed and fabricated (fig. 2). The blades have been made of fibre plastic materials which ensure resistance at bending and torsion. In order to reduce the cost of wind station the multiplier of rotor gyration is absent and the three-blade rotor gyration is transmitted directly to a frontal generator isochronous with low speed permanent magnets (approximately 100 min^-1 ), by excluding the multiplier. The starting speed of the wind station is 3 m/s. At the speed of 4m/s the wind station produces approximately 2 kW of electrical energy; at 8 m/s – 10kW; 10 m/s -15kW; 12m/s – 25kW. When the speed is 8-9 m/s the wind station performs 100-120 min^-1.

Fig.1 Wind station with asymmetrical airodynamic profile blades

Fig.2 The three-blade rotor (industrial prototype)

Innovative Aspect and Main Advantages:
The efficiency of the Wind station with asymmetric aerodynamic profile of blades depends completely on the efficiency of the rotor. The three-blade rotor with the elaborated asymmetric aerodynamic profile allows an increase in the efficiency of the wind energy conversion. The proposed diagram of the Wind station ensures such basic advantages as the utilization of aerodynamic asymmetric profiles of blades; the efficiency of the electrical generator is about 92%; relatively reduced costs due to the constructive simplicity (absence of multiplier, and the construction of station protection mechanism for wind high speeds is simple).

Areas of Application:
The designed wind station aims at the satisfaction of energy needs (for example, electrical or mechanical energy utilization for water pumping for irrigation purposes) of decentralized consumers (farmers, owners of chalet or small hotels located in places which are not easy to be accessed – mountains, small islands, etc.).

Stage of Development:
The construction of the wind station with the rotor 9 m diameter and with an isochronous generator with permanent magnets D550x250mm has been designed and its industrial prototype is in phase of fabrication. The ETALON Centre for Advanced Technologies Implementation at the Technical University of Moldova will produce low cost micro hydropower stations at the demand of the decentralized consumers..

Contact Details:
Technical University of Moldova
Contact persons:
Ion Bostan, Valeriu Dulgheru
Address:
Republic of Moldova, Chisinau, 168, Stefan cel Mare Ave., Centre for the Elaboration of Renewable Energy Conversion Systems (CERECS)
Tel/Fax:
+ (373 22) 23 78 61,
+ (373 22) 44 50 88
E-mail:
bostan@adm.utm.md;
dulgheru@mail.utm.md