2019 – 2020
أ.د. حسن الجمل
أ.د. السيد صابر
Wind harvesting converts the mechanical energy caused by the wind into electrical energy. Successful harvesting depends on the two basic variables of wind direction and speed. Wind harvesting collect and store the electrical energy to be used for electronic devices. Their used types in this project are: –
- Small scale wind turbine
- A novel Solution to Remote Sensing:- in this type Piezoelectric Windmill consists of piezoelectric actuators arranged along the circumference of the mill in the cantilever form. A working prototype was fabricated utilizing 12 bimorphs (60×20×5mm3) having a preload of 23.5 gm flow and oscillating frequency of 6 Hz, a power of 10.2mW was successfully measured across a load of 4.6 k
- Evaluation of Centimeter-Scale Micro Wind Mills: Aerodynamics and Electromagnetic Power Generation:- in this type the reference 46° at the tip has been tested from 5.5 m/s to 11.8 m/s with a total of 5 different airspeeds. The two others which is 26° at the tip and 19° at the tip were tested at 10.25 m/s
- CM-Scale air turbine and generator for energy harvesting from low-speed flows:- in this type Wind tunnel tests have been performed on prototypes a 2 cm diameter wind turbine with 6 and 12 blades. The 12-blade design achieves a generator output power of 4.3 mW at a tunnel flow speed of 10 ms-1, and will operate at flow speeds down to 4.5 ms-1
- Small Wind Energy Harvesting from Galloping Using Piezoelectric Materials:- in this type we use cantilever beam clamped at one end and a tip body attached to its free end. A prototype device is fabricated with different tip bodies having various cross sections, lengths, and masses. Wind tunnel tests are conducted to determine the influence of these parameters on the power generated. A peak output power of 8.4 mW is achieved at a wind velocity of 8 m/s for the harvester with a tip of square section.
- Vortex induced vibration (VIV)
- Energy harvesting EEL:- in this type placing a piezoelectric membrane in the wake of a bluff body and using the von Karman vortex street forming behind the bluff body induced oscillations in the membrane. The oscillations result in a capacitive buildup in the membrane that provides a voltage source that can be used
- Wind generated electrical energy using flexible piezoelectric materials:- in this type we use flag-like membranes (termed piezo elements or bimorphs) composed of flexible piezoelectric materials and voltage generated to electrodes positioned on the surfaces of the material via the piezoelectric properties of the material. The best results to date using PVDF (polyvinylidene fluoride) as the piezoelectric material are 10 mW of dc power (50 Vdc across 250 kΩ) obtained from a single bimorph element (size about 8X11X 0.02) flapping a frequency of 5 Hz in a wind speed of 15 mph.