active flow control

[afc99]

Does anybody know if active flow control is being considered or studied under any active contract by NREL

[Pat.Moriarty]

Hello,

Our partners at Sandia have a contract with Case van Dam at the University of California Davis to look at MEMS microtabs near the trailing edge of aifoils. Although, I believe this work is now finished. There has also been some recent work out of Georgia Tech by Tongchitpakdee, but I don’t believe we are supporting it.

Often the tradeoff of active flow control is the benefit vs. complexity and power consumed. To date, no commerical turbine has been sold using flow control, but perhaps the right technology has yet to arrive.

What is your interest?

cheers,
Pat

[Jose.Zayas]

afc99,

Like Pat mentioned previously, Sandia has a research effort around active control for WT blades. We currently have a contract with UCDavis to investigate the benefits of active control using Microtabs. In addition to that work, I am investigating other potential devices. If you are interested in discussing some of the work, feel free to e-mail me.
jrzayas@sandia.gov

[Hernan.Ochoa]

Dear Mr. Zayas,

My name is Hernán Ochoa and i’m currently studying a Master degree in CIDESI Queretaro, México. I’ve been using FAST8 codes to simulate torque control and pitch control systems for the NREL’s WP 1.5 MW turbine. I was trying to figure out how to implement microtabs within the FAST code and i barerly found information about it.
Would you help me out with this problem?

In Wilson’s paper named “ACTIVE AERODYNAMIC BLADE CONTROL DESIGN FOR LOAD REDUCTION ON LARGE WIND TURBINES”, this control is implemented.

• how is this input enabled?
• What is the configuration that need to be made within FAST code?

I would really appreciate you to help me out with this information.

Best regards,

[Jason.Jonkman]

Dear Hernan,

The ability to specify MulTabLoc within Simulink is not a standard feature of the FAST v8 interface to MATLAB/Simulink. You will have to customize the FAST source code to achieve this. The following forum topics may help a bit:

Variable airfoils using the MulTabLoc USER function

Wth the modifications you have done, you should not have to recompile the FAST_SFunc.mexw32 or FAST_SFunc.mexw64 files. What you do need to recompile is the FAST_Library_Win32.dll or FAST_Library_x64.dll file. If you have compiled the FAST_Library dll and are still getting the error with the OpenLoop example, you need to isolate the problem: is it coming from the Simulink model or from your changes to the FAST source code? Have you changed the OpenLoop example at all? If NumAdditionalInputs = …

Movable trailing edge flaps implementation

Dear Srinivasa, Depending on the configuration of the actuators you are talking about, the actuator may or may not impact the structural properties (e.g., trailing-edge microtabs probably won’t impact the structural properties, but deformable trailing edges might). If it is reasonable to assume that the actuator will affect the airfoil data and not the structural properties, it may be reasonable to use AeroDyn’s MulTabLoc option (with suitable modification) to model the actuators. The MulTabL…

Best regards,