Help Me Calculate Wind Power in Turbine Shaft!

[xstarlogic]

I really need help in my undergraduate thesis which focus on wind energy.

Goal
I want to calculate the amount of Power in the wind turbine shaft, which later used to calculate the efficiency of my wind turbine.

Material
My wind turbine uses 3-blade household common fan as blade which have diameter of 39 cm and is conected to a shaft which have diameter of 9 mm.

Measureable
Using the available measuring device, I can therefore measure:
- Wind Speed (m/s)
- Rotational speed (rpm)
- Generator Voltage (V)
- Generator Current (A)

Measuring attempt flaw
I tried making a simple dynamometer with breaking system on the shaft, the brake system was connected to a Newton scale. The result was full of flaw as the brake was instable causing vibration in the Newton-scale. When the recorded data was calculated, with wind speed of 6.5 m/s, the Power in the shaft was 0.7 Watt, But when a loaded Generator was attached to the shaft, the generator generates 3 Watt.

I tried to calculate by means of Inertia, but disigning and attaching flywheel needs plenty of time. Furthermore the Tachometer available calculate speed of rotation approximately at rpm with update rate of 1.5 seconds (Time flaw)

My last option is to use generator, or by electrical means.

All help are appreciated, if posible please reffer the resource. Lots of Thanks

 

[Navin A S]

.SolutionOne way to calculate the power in a wind turbine shaft is to use an inverter and measure the input and output power of the inverter. The input power is equal to the power of the wind turbine, and the output power is equal to the power in the shaft. This method can be used with any type of wind turbine, and has the advantage of being relatively quick and easy to set up. Additionally, this method allows you to measure the efficiency of your wind turbine by comparing the input and output power. Another option is to use a torque meter, which measures the torque applied to the shaft and then calculates the power based on the rotational speed. This method is more accurate than the inverter method, but requires more time and effort to set up.Finally, you could also calculate the power in the shaft using the equations of motion. This requires knowledge of the mass of the rotating parts, the rotational speed, and the air density, among other parameters. This method is the most accurate, but is also the most complex. Whichever method you choose, it's important to make sure that your measurements are as accurate as possible, as even small errors in your calculations can lead to large discrepancies in the results.