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Hand-Calculations of Expected Results

Power coefficient (Cp)

Calculate Cp? need first to see if its possible to calculate that. Maybe from the torque.... from the Ct=T/(1/2*rho*v^2*A*R) and Cp=lambda*Ct ....???

Tip Speed Ratio (TSR)

The expression for TSR is: 

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Therefore, the expected velocity at the center of the blades is 0.1676m/s and therefore the TSR is 0.01676.

We expect large vortices downstream the turbine?

We may want to use the following simplifications:

• Assume the airfoils are flat plates of 0.1x2cm, positioned on a pitch angle of 20deg, i.e. the plates are placed such that when they are at the upper-most part its trajectory, they form an angle of 20deg with the horizontal.
• Incoming flow with a constant profile of 10m/s in the horizontal direction
• The downstream pressure is constant 101325 Pa.
• Air with density of 1.225kg/m3 and viscosity of 1.7894e-5 Pa.s. 
• 2D analysis

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Start-Up

Now we'll start with the Ansys part. It is recommended that you leave this tutorial side by side with the Ansys screen, with Ansys taking 2/3 of the screen and the tutorial, 1/3.

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