How to calculate the torque produced by a turbine

[amrbekhit]

Hello all,

How do you calculate the torque produced by a turbine? If we consider the turbine shown below:

Assume that this turbine is working underwater, with a fluid speed of 2m/s and that the turbine itself is 10mm thick. In order to calculate the speed, I work out the time taken for the water to flow from one side of the turbine to the other. In this case, the time would be 0.01/2 = 0.005s. Since each blade represents 0.1 revolutions, the rotary speed of the turbine would 0.1revs/0.005 = 20rps, which is 1200rpm. Is this correct?

How would I then calculate the torque produced by the turbine? I'm guessing that this involves knowing the pressure of the fluid, knowing area of the blades projected onto a plane and then working out the force produced and then multiplying by a distance from the rotation axis to produce a torque. However, although I think I have a vague idea of how to calculate it, I'm not sure about the details.

Any ideas?

Thanks,

--Amr

 

[GTstartup]

Oh the old underwater turbine torque calculation. If I had a dime.......

 

[byrdj]

T = ? (M VT R)

to produce torque, there must be a change