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How would you find out the angular velocity of a wind turbine

You are currently reading a thread in /sci/ - Science & Math

Thread replies: 19
Thread images: 5
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How would you find out the angular velocity of a wind turbine only knowing the RPM and wind speed?
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>>8059040
waaaaaait a second, is this homework?
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File: 20160508_110146.jpg (1 MB, 3264x2448) Image search: [Google]
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>>8059046
Theres a wind turbine right over there see? I took a picture of it.
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wind speed right now is 13 mph
so 5.811 m/s
and it's spinning at about 65 RPM

so angular velocity must be...
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Reminder: Homework should be posted over at >>>/hm/
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Knowing the RPM, you know everything.
RPM/60=Rotations per second=frequency
Angular velocity = 2*pi*frequency
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I was just curious about how much power it'd be outputting.
And I figured the angular velocity part out but now I don't know the torque... and there's no way to find out the force
So it doesn't matter I guess
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>>8059040
Seems like wind speed is extraneous. If you know the RPM, you know the angular velocity.
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>>8059099
Knowing the windspeed would give an upper bound on power and torque, knowing the angular velocity.
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>>8059046
>>8059083
>simple questions must be homework
As someone from /diy/ this pisses me off so much, and to cap it off most of you couldn't answer the question anyway, Wind turbines are a popular project for many and a lot of people are interested in the mechanics behind it. I assume OP is one of them
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>>8059099
>>8059040

Tangential speed is omega (rad/s) * radius (m)

RPM to rad/s

cycle/min * 2pi/60 seconds

If you don't have a radius then just use a variable.
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>>8059707

I will present something interesting related to wind turbines soon.
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>>8059099
Cp is power coefficient, about 0.39
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>>8059754

To prevent further questions, rho, is probably density in this formula, so for an ideal gas it's (pressure*z) / ( gas constant*temperature)

For an ideal gas z = 1 and that's molar density so you might need to convert the density to a mass density by multiplying by the molar mass of air.

Can't be sure without reading a book since a unit analysis can not be performed without knowing the units of the coefficient
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>>8059040
Me brainlet. Need radius.
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>>8059754
>cp

MODS!!
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>>8059040
USE NUCLEAR YOU TARD
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>>8062025
/thread
but will bump with sweet as turbine shots
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File: Fowler Ridge Wind Farm.jpg (937 KB, 1064x1600) Image search: [Google]
Fowler Ridge Wind Farm.jpg
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>>8062032
Thread replies: 19
Thread images: 5

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