Data about NREL Horizontal-Axis Tidal Current Turbine

Discuss tidal-current device design and modeling

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Bruno.Nguyen
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Organization: ENSTA ParisTech & DTU
Location: Denmark

Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Bruno.Nguyen » Mon Mar 10, 2014 8:21 am

Dear all,

I am currently studying on tidal turbine wakes in the frame of my master thesis and I am using the NREL-developed software SOWFA.
Now that I am getting more and more familiar with it thanks to the tutorials, I would like to begin to customize it to fit my aims.
However, I cannot find any tidal aerodynamic blade data publicly available, with which I could change the blade inputs (i.e. airfoils Cl and Cd vs alpha, airfoil distribution vs radius, etc..).
I did stumble upon a NREL paper entitled "Structural Design of a Horizontal-Axis Tidal Current Turbine Composite Blade " by G.S. Bir, M.J. Lawson and Y.Li in which a tidal turbine is designed.
As a consequence, I was wondering if you were willing to publish the blade data which are needed to run SOWFA.

Thanks in advance,

Regards,

Bruno.

Michael.Lawson
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Location: Boulder, CO

Re: Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Michael.Lawson » Mon Mar 10, 2014 11:43 pm

Hi Bruno,

The HARP-Opt (http://wind.nrel.gov/designcodes/simulators/HARP_Opt/) files for the blade design can be downloaded here - https://www.dropbox.com/s/xy0if1iyp82p8 ... mDanny.zip. If you are not familiar with HARP-Opt, it is a MATLAB based blade design tool.

The HARP-Opt files should contain all the airfoil data you need to run SOFA. Let me know if you have any further questions.

Cheers,

-Mike

Bruno.Nguyen
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Joined: Mon Mar 03, 2014 1:51 am
Organization: ENSTA ParisTech & DTU
Location: Denmark

Re: Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Bruno.Nguyen » Tue Mar 11, 2014 9:21 am

Hi Mike,

First of all, thanks a lot for your quick answer.
While browsing the airfoil files, I noticed that Cl and Cd were computed for Reynolds numbers between 2 and 14 millions.
I was wondering if for hydro-turbines simulations you were using the highest Reynolds number data by default (i.e. 14 millions), as Re should be around 5 10^7 or if you were using an other set of data.

Thanks in advance,

Regards,

Bruno

Michael.Lawson
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Location: Boulder, CO

Re: Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Michael.Lawson » Tue Mar 11, 2014 11:53 am

For the turbine described in the paper you referenced the Re number is between about 2 and 8 million.

For the turbine the Re ~ 2*pi*radius*chord*RPM/60 / viscosity. Note that the oncoming flow component of velocity is not significant.

Viscosity for salt water is ~1e-6

Does that clear it up?

Bruno.Nguyen
Posts: 7
Joined: Mon Mar 03, 2014 1:51 am
Organization: ENSTA ParisTech & DTU
Location: Denmark

Re: Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Bruno.Nguyen » Thu Mar 13, 2014 1:43 am

Hi Mike,

It does clear this up. Thanks a lot for your input.

Regards,

Bruno

Bruno.Nguyen
Posts: 7
Joined: Mon Mar 03, 2014 1:51 am
Organization: ENSTA ParisTech & DTU
Location: Denmark

Re: Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Bruno.Nguyen » Thu Mar 27, 2014 6:42 am

Hi Mike,

I have now implemented the tidal turbine with SOWFA and it works well when I force rotational speed and pitch. However, I would like to know the consequence of a turbine downstream flow on a turbine located behind. In order to do that, I need to tune the torque and pitch controllers provided with SOWFA. However, I haven't been able to find the correct values yet, and I was wondering if you had already designed these controllers values for this turbine. Moreover, could you tell me where I can find a detailed description of the controllers?

Thanks in advance,

Regards,

Bruno.

Danny.Sale
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Joined: Tue Jul 13, 2010 4:55 pm

Re: Data about NREL Horizontal-Axis Tidal Current Turbine

Postby Danny.Sale » Tue Feb 03, 2015 7:53 pm

Hi Bruno,

As far as I know, there was no controller specified for the Reference Model 1 tidal turbine, probably a good place to start is copy from NREL 5MW wind turbine example, as these are both variable-speed variable-pitch variable-yaw turbines. There are some recent files available on GitHub https://github.com/nnmrec/fastFlume related to modeling this turbine with SOWFA, but a controller has not yet been implemented. If you find any good resources, or make some progress on this I'd be happy to know! Thanks, and best success with your thesis research.

Thanks,
Danny


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