Learizing Baseline 5MW Wind Turbine with FAST

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Ali.Elyaakoubi
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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Wed Mar 09, 2016 3:20 am

Thank you very much for your reply Mr Janson.It is exactly what i want to calculate the the aerodynamic torque as a function of the wind speed and the retational speed.
Enable me to ask you how to extract these coefficient.I have read the document that you have provide me and i have did the simulation with the standlone driver aerodyn, I obtained the output file. But not enough details apperas in the documentation about how to extract the coefficient from the output file and also to configure the simulation with what i want.
If you can please tell me how to obtain the coefficient for the 5MW WT.

Sinceerly

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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Wed Mar 09, 2016 6:44 am

Dear Ali,

The standalone AeroDyn driver input file can be set up to run multiple cases for different wind speeds (WndSpeed), rotor speeds (RotSpd), and pitch angles (Pitch) via the "Combined-Case Analysis" options. You can include the rotor aerodynamic torque in the AeroDyn output file by including "RtAeroMxh" in the output list (OutList) in the AeroDyn primary input file. Simply run multiple cases and take the time- (or, preferably, azimuth-) averaged torque to find the RtAeroMxh as a function of WndSpeed, RotSpd, and Pitch (or the like).

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
Joined: Wed Oct 21, 2015 8:43 am
Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Thu Mar 10, 2016 12:42 pm

thank you very much for your very helpful response
But it still me some ambiguities
For example i have run the simulation and the results are follew

Code: Select all

Predictions were generated on 10-Mar-2016 at 19:23:52 using AeroDyn_driver (v1.00.00-bjj, 7-Oct-2015)
 AeroDyn (v15.00.00b-bjj, 6-Oct-2015)

Case 1: WndSpeed=5 m/s; ShearExp=0 ; RotSpeed=71.9 rpm; Pitch=0 deg; Yaw=0 deg; dT=3.97000E-02 s; Tmax=0.8345 s

     Time              RtAeroMxh
      (s)              (N·m)     
         0.0000   -9.401E+01
         0.0397    3.617E+02
         0.0794    3.617E+02
         0.1191    3.617E+02
         0.1588    3.617E+02
         0.1985    3.617E+02
         0.2382    3.617E+02
         0.2779    3.617E+02
         0.3176    3.617E+02
         0.3573    3.617E+02
         0.3970    3.617E+02
         0.4367    3.617E+02
         0.4764    3.617E+02
         0.5161    3.617E+02
         0.5558    3.617E+02
         0.5955    3.617E+02
         0.6352    3.617E+02
         0.6749    3.617E+02
         0.7146    3.617E+02
         0.7543    3.617E+02
         0.7940    3.617E+02
         0.8337    3.617E+02

the average value =sum(value)/sum(number of time step)
So what represent the obtained value in relation to a and b
thank you to calrifiy plus

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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Thu Mar 10, 2016 1:23 pm

Dear Ali,

This is a single simulation showing that the aerodynamic rotor torque (RtAeroMxh) at 5 m/s and 71.9 rpm is 3.617E+02 N·m. You'll have to run additional simulations at different wind speeds and rotor speeds in order to form a surface from which to derive "a" and "b".

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
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Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Fri Mar 11, 2016 7:24 am

Ok so if i would like to works on the 5MW i should parameters firstely the file.dvr( Numblades=3,HubRad=1.5,HubHt=90;for Overhang,ShftTilt,Precone i change their values or not?); and I use the aerodynamique file with Airfoils and the balde file given in the archive as it is or i must change somthings?
After i did the simulation for differents values of wind speed and the rotational (of course these should be raisonable, i.e it must located in the partial load operation of the wind speed (wind<11,4 and rotational speed<12,1elsewhere we must consider the blade pitch value). Therefore as we increase the number of simulations as the result are accurate i think and finally, "a "represents the slope of the torque according the wind speed axis and "b" is the slope according to the rotational axis
Tell me please if these points is raisonable or there is somthings wrong

Sinceerly

Jason.Jonkman
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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Fri Mar 11, 2016 9:14 am

Dear Ali,

Yes, that sounds reasonable. The Overhang, ShftTilt, and PreCone of the NREL 5-MW turbine are -5.0191 m, -5 deg, and -2.5 deg, respectively.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
Joined: Wed Oct 21, 2015 8:43 am
Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Fri Mar 11, 2016 9:50 am

Thank you very much Mr Janson for your clear response
It still me a thing from your previous speech "run multiple cases and take the time- (or, preferably, azimuth-) averaged torque", what you means by multiples cases ? and how i can average the torque on the azimuth rather than time?

Jason.Jonkman
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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Fri Mar 11, 2016 10:01 am

Dear Ali,

Without skewed flow (without shaft tilt or nacelle-yaw error), the aerodynamic torque will be constant, as your results have shown in your post dated Mar 10, 2016 above. In this case, there is no need to time- or azimuth-average the results. If you introduce skewed flow, the aerodynamic torque will be periodic with a period of a rotor revolution. I was suggesting that you calculate the average torque over a revolution (known as azimuth-averaging).

By "multiple cases", I meant that you should run additional simulations at different wind speeds and rotor speeds.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
Joined: Wed Oct 21, 2015 8:43 am
Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Sat Mar 12, 2016 1:46 pm

Thank you very much Mr Janson for your clear response, really it help me well to resolve the problem
However it still some informations to know:
the equivalent inertia of the wind turbine of 5MW (if we consider it as a lumped mass)=Hub inertia+Nacelle inertia or what

Jason.Jonkman
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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Mon Mar 14, 2016 6:31 am

Dear Ali,

I'm sorry, but I don't understand your question.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
Joined: Wed Oct 21, 2015 8:43 am
Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Mon Mar 14, 2016 7:21 am

Dear Jonson
I would like to know the mass inertia of the wind turbine (5MW) i.e whene only the GenDOF is enabled

Jason.Jonkman
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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Mon Mar 14, 2016 7:29 am

Dear Ali,

I'm still not understanding. Do you want to know the rotor inertia about the shaft, the equivalent drivetrain inertia (rotor + gearbox + generator) about the shaft, the entire inertia of the rotor-nacelle assembly (RNA), the entire inertia of the wind turbine (RNA + tower), or something else?

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
Joined: Wed Oct 21, 2015 8:43 am
Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Mon Mar 14, 2016 8:00 am

Exactly i want the rotor inertia about the shaft
I modeled the system with: Jt*dOmega_r/dt=Ta/GB-Tem(Ta is the aerodynamic torque, Tem is the electromgnetic torque, GB is the gearbox and Omega_r is the rotor speed)
and Jt is the equivalent inertia of the system=Jr+GB^2*Jg
So i want Jr : the rotor inertia about the low shaft

Jason.Jonkman
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Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Jason.Jonkman » Mon Mar 14, 2016 10:33 am

Dear Ali,

I think you meant to say: Jt*dOmega_r/dt=Ta-Tem*GB.

Regardless, when running FAST v8, the rotor inertia, Jr, is written to the ElastoDyn summary file. For the NREL 5-MW turbine, the rotor inertia is 38,759,228 kgm^2.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Ali.Elyaakoubi
Posts: 94
Joined: Wed Oct 21, 2015 8:43 am
Organization: abdelmalek Essaadi University
Location: MOROCCO

Re: Learizing Baseline 5MW Wind Turbine with FAST

Postby Ali.Elyaakoubi » Mon Mar 14, 2016 2:53 pm

Its true
Thank you very much for your help
Best regards


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