output power of wind turbine
 

hi
I had simulated a wind turbine using fluent and I want to calculate the output power(mechanical power) of it in different wind speeds .
I don't know how to evaluate the output power.
would you plz help me??

Power = Torque*omega.
Assume the axis of the rotor is in the z-direction, and you set the origin at the axis of your rotor, then torque is the z-moment. The omega is angular velocity you specified for the rotor.

tnx a lot dear
it was really useful for me.
i have another problem which my moment amounts are negative!!!!
my flow comes from y- to y+
i had set my velocity inlet -11
and my rotation direction is +y

would you plz help me???

hi dear
i have got smaller amount for my simulation using your formula mentioned above.
all of them are 100 order smaller:
46kw in stead of 4600kw


would you plz help me to find the reason.

hi blackmask
i,m using the way that you mentioned in this forum but my results are about 10 times bigger than the exact amounts.


i really need help:(.would you plz guide me???

Then the power coefficient should exceed the Betz limit. Make sure that the angular velocity is expressed in rad/s rather than RPM.

my angular velocity is in rpm and i set it in units panel too.

where can i change the cp in fluent????
or how can i totally reduce cp ??????:confused:

OK. Tell me your RPM, aerodynamic torque and the rated power of the wind turbine. If your result is reasonable then you might calculate your power with the wrong unit for ten is closed to 60/(2 pi).

my rated power : 5 MW
torque in fluent: 51084019 nm
ang velocity:12 rpm

my rated power : 5 MW
torque in fluent: 51084019 nm
ang velocity:12 rpm

Are you sure? The aerodynamic torque is 5.1E7 N.m.
T=5.1E7
omega = 12*2*pi/60 = 1.2566
P = T*omega = 64.2 MW
What is your rotor diameter, rated velocity and the velocity your used in your computation?

i have this torque from:report-forces-moment-moment center(0,0,0)
rotor diameter:63m
rated wind velocity:11m/s
rated ang velocity and my rotational velocity :12rpm

i have this torque from:report-forces-moment-moment center(0,0,0) total moment in y direction
rotor diameter:63m
rated wind velocity:11m/s
rated and velocity and my rotational velocity :12rpm

What is the location of your rotor shaft?

the center of hub is located at (0,0,0)
the blades rotate around y axis

i imported geometry from gambit

do you have any idea about this problem?
any suggestion:(

Maybe your computation does not converge. Please check your converge history. If possible please post a contour plot of axial velocity on a slice at the hub height.

this are photos of my residuals and velocity contour
in addition mass flow rate difference between inlet and outlet is 250 kg/s when the total inlet mass flow is 693639.75 kg/s

axial velocity contour in y=0 plan

Please monitor the force and moment of your rotor and continue calculation until the force and moment converge.

hi blackmask
i had done what you told.

please take a look at this photos and check if my solution is converged or not.
in this situation the torque is 44944300:confused: