Is there an empirical formula to calculate horizontal aerodynamic thrust for Horizontal Axis Wind Turbine for operational and stopping condition ?
I do not know if there is an empirical formula, but you can calculate the formula quite easily by modelling the wind turbine as a propeller. Supposing you know the pitch angle of the blades, you then can determine thrust with the help of force equilibrium
Hi,
If you are calculating the thrust for the purpose of designing the tower and foundation of the tower, then you need a "simple" maximum thrust when the wind turbine is operating under the "highest wind speed". In this case, you could use the formula
T = 0.5 X rho X V3 X A X CT
The problem here is the CT value. I suppose for any given wind turbine, this value would be given. And the maximum operating wind speed would be given as well - most were designed for 15 m/s, and most would feather at 22 m/s. Rho is the air density at the site - the standard density (ISA) is 1.225 kg.m3. With these you can now find the MAX thrust. Of course you have to multiply the value accordingly, when you design the tower, and its foundations.
I hope this helps.
Wan Zaidi
Yes, A is the rotor area. You can check the validity and accuracy of the equation from many texts. reading other texts would give you more confidence in applying this basic equation.
Still, you have to get the CP value from the manufacturer of the turbine.
Wan Zaidi
Try his: http://www.m-hikari.com/ams/ams-2012/ams-89-92-2012/manyongeAMS89-92-2012.pdf
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