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Home Q & A Board Science-Related Homework Help Physics
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datwillis datwillis
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11 years ago
I am going to do a project on vertical axis wind turbine and its testing using different design of blades. With different blades i may get different rpm of shaft. The rpm can be measured by a digital tachometer. But to know the power we should also know the torque as P=2pieNT/60. So please tell me how can i determine the torque of the shaft.
Thankyou!
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#1
11 years ago
Power equals torque dotted into rotational velocity.

P = t (dot) w = twcos(theta)   *theta is the angle between torque and angular velocity*

twcos(theta) = 2(pi)NT / 60

t = [2 (pi) NT] / [60 w cos(theta)]

Omega can be found simply by finding the RPM with your tachometer.


OR

You could just do

t = I w

that is if you know the moment of inertia for your turbine

The first method is easier
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