Search found 24 matches

by Majjari.Chaitanya
Mon Jan 30, 2017 6:59 am
Forum: Airfoils
Topic: Airfoil Geometry
Replies: 1
Views: 5198

Airfoil Geometry

Hello Everyone,

Is it possible to get the airfoil geometry of the NREL5MW turbine airfoils? I have been searching in the internet, but I did not found any source. It would nice if someone provide me source to find them.

Regards,
Chaitanya
by Majjari.Chaitanya
Fri Jan 27, 2017 10:41 am
Forum: Airfoils
Topic: Steady airfoil coefficients extrapolation
Replies: 0
Views: 7884

Steady airfoil coefficients extrapolation

Hello Everyone, I'm working on three dimensional rotational effects on the wind turbine blades. I have also some three dimensional corrections models with me. The most important thing to be considered for the effective implementation of 3D correction methods is the input steady airfoil coefficients....
by Majjari.Chaitanya
Wed Jan 11, 2017 2:59 am
Forum: General
Topic: UpWind Reference Wind Turbine Excel book
Replies: 1
Views: 2345

UpWind Reference Wind Turbine Excel book

Dear Mr. Jason Jonkman,

I have a small and quick question on the NREL 5MW wind turbine. I'm trying not to be rude, but short and simple. Does the Excel workbook on "Upwind Reference Wind Turbine", is accessible to everyone?

Best Regards,
Chaitanya Majjari
by Majjari.Chaitanya
Tue Jan 03, 2017 12:46 am
Forum: Airfoils
Topic: Reynolds number of the airfoil data
Replies: 5
Views: 9729

Re: Reynolds number of the airfoil data

Hello Mr.Jason Jonkman, First of all I wish you Happy New Year!!! Thank you very much for your time and effort to reply. The information, you have provided is very helpful to me. I'm implementing the three dimensional correction method dynamically in a load simulation tool, for that I need the stead...
by Majjari.Chaitanya
Mon Jan 02, 2017 3:00 am
Forum: Airfoils
Topic: Reynolds number of the airfoil data
Replies: 5
Views: 9729

Reynolds number of the airfoil data

Hello, I have a question regarding the reynolds numbers used, in the generation of steady airfoil coefficients,for the reference turbine NREL 5MW. In the chapter 2 of the document "Definition of a 5-MW Reference Wind Turbine for Offshore System Development", it is mentioned that the blade ...
by Majjari.Chaitanya
Tue Dec 06, 2016 6:22 am
Forum: Airfoils
Topic: Airfoil Prep - 3D corrections
Replies: 3
Views: 5220

Re: Airfoil Prep - 3D corrections

Respected MR. Jason Jonkman, Thank you for your reply. I have made the statement "single angle of attack", as I though that the Rotor rpm and the wind speed are used to find the particular angle of attack. At present, I'm working on the implementaion and positioning of the 3D corrections i...
by Majjari.Chaitanya
Mon Dec 05, 2016 2:57 am
Forum: Airfoils
Topic: Airfoil Prep - 3D corrections
Replies: 3
Views: 5220

Airfoil Prep - 3D corrections

Hello Everyone, I'm working on the Adaptive trailing edge flap dynamic stall model(A beddoes Leishman type dynamic stall model). I have to implement this model in OneModelica library simulation tool. In order to validate the model, I have generated the steady airfoil coefficients for DU21 airfoil, a...
by Majjari.Chaitanya
Wed Sep 14, 2016 3:05 am
Forum: Airfoils
Topic: Airfoilprep Lift Spikes
Replies: 6
Views: 11386

Re: Airfoilprep Lift Spikes

Dear Jason, Thank you for your quick response. I have managed to get the appropriate airfoil coefficients from XFLR5 and then used Airfoilprep to get corrected and interpolated data. I have referred to NREL 5MW wind turbine document and DOWEC 6MW document to find the appropriate reynolds number and ...
by Majjari.Chaitanya
Mon Sep 12, 2016 10:42 am
Forum: Airfoils
Topic: Airfoil coefficients data with active flap angles
Replies: 1
Views: 4592

Re: Airfoil coefficients data with active flap angles

Hello Everyone, I'm patiently waiting for some helpful suggestions of my question. Meanwhile, I would like to present some more information I have gathered. I have generated the airfoil coefficients Cl. Cm and Cd using XFLR5 for flap angles in the range -10 to 10 degrees for the airfoil DU40_17. To ...
by Majjari.Chaitanya
Mon Sep 12, 2016 10:33 am
Forum: Airfoils
Topic: Airfoilprep Lift Spikes
Replies: 6
Views: 11386

Re: Airfoilprep Lift Spikes

Dear Jason and Kisorthman, Thanks for your informative comments from both of you. I have the following questions: 1. In the AirfoilPrep_v2p0_DU40_A17.xls provided ba Jason, the sheet Interpolate contains the data from angle of attack 0 - 90 degrees. Have you generated these data using Xfoil or Is it...
by Majjari.Chaitanya
Fri Sep 09, 2016 4:57 am
Forum: Rotor Aerodynamics
Topic: Movable trailing edge flaps implementation
Replies: 45
Views: 23264

Re: Movable trailing edge flaps implementation

Hello Xiao, I have used the XFLR5 to generate the airfoil coefficients with flap. I have used the coordinates of the airfoil provided in the FAST 5MW wind turbine. For example I have loaded the DU21_A17 airfoil coordinates with Reynolds number = 0.75E6. I have not found anything else to change. I ha...
by Majjari.Chaitanya
Fri Sep 09, 2016 2:22 am
Forum: Rotor Aerodynamics
Topic: Movable trailing edge flaps implementation
Replies: 45
Views: 23264

Re: Movable trailing edge flaps implementation

Hello Xiao,
Thank you very much. This tool is very handy.
Regards,
Chaitanya
by Majjari.Chaitanya
Thu Sep 08, 2016 9:00 am
Forum: Rotor Aerodynamics
Topic: Movable trailing edge flaps implementation
Replies: 45
Views: 23264

Re: Movable trailing edge flaps implementation

Hello Jason and Srinivasa, I went through the whole discussion and it is quite informative. I'm working on ATEFlap(Adaptive trailing edge flap) aerodynamic model. In order to verify my model I need airfoil data with different flap angles. As per your discussion you have mentioned that it is possible...
by Majjari.Chaitanya
Wed Sep 07, 2016 10:21 am
Forum: Airfoils
Topic: Airfoil coefficients data with active flap angles
Replies: 1
Views: 4592

Airfoil coefficients data with active flap angles

Hello Everyone, I'm working on Adaptive Trailing Edge Flap Aerodynamic model(ATEFlap). I'm using the report from DTU on this model as reference. I have implemented the preprocessor required for the ATEFlap model in a objected oriented programming language. I have airfoil data for one aifoil with act...
by Majjari.Chaitanya
Wed May 04, 2016 7:59 am
Forum: Rotor Aerodynamics
Topic: Questions regarding Equilibrium and Dynamic Inflow model
Replies: 3
Views: 3793

Re: Questions regarding Equilibrium and Dynamic Inflow model

Hello Jason,

Thanks for the reply. My question regarding BEM actually refer to one the topic in forum:https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&t=538&p=1942&hilit=gdw+tsr#p1942

Even my question regarding GDW (DynIn) is from the same topic.

Thanks
Chaitanya

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