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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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