Vertical axis wind turbine design, torque help

AI Thread Summary
The discussion focuses on designing a modified Savonius vertical axis wind turbine and the challenges in predicting torque and efficiency. The initial torque calculation using the formula Torque = power/ angular velocity resulted in an unrealistic 100% efficiency value. To accurately determine efficiency, it is suggested to compare the total work extractable from wind to the actual work produced by the turbine. Calculating tangential force and average torque over a full rotation is recommended for a more accurate assessment. The conversation highlights the need for a proper understanding of wind turbine efficiency metrics.
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Hi i am currently doing my dissertation in which i am designing a vertical axis wind turbine design that is a modification of that of a savonius design. A major problem that i am having is being able to predict the torque value of torque for my design in order for me to then predict the efficiency. I calculated the torque initially using the equation Torque = power/ angular velocity but this then went on to give me a 100 percent efficiency value which obviously is wrong.

Any help would be fantastic thanks.
 
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Power is defined as torque times angular velocity. The proper definition of efficiency for your wind turbine will lie in some other formulation. For instance, what is the total amount of work which could be extracted from a given wind field versus the amount of work actually produced by the wind turbine?
 
Ft= 1/2 CtρchW^2 how about calculating the tangential force then the average toruqe:

then have to use some sort of average torque equation for angles from 0 to 360 then take an average ?

Thanks a lot for the reply.
 

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