Propulsion Kite Models Sample Clauses

Propulsion Kite Models. As with the Flettner Rotors, Kit systems have both lift and drag forces acting on them, therefore, as before; Where; ρ = Density of fluid [kg m−3] (dependent on temperature) U = Speed of fluid in the frame of reference of the cylinder [ms-1] A = Cross sectional area [m2] CL= Coefficient of lift [-] CD= Coefficient of drag [-] A kite system will have quite different values of CL and CD. In the case of the Flettner Rotor, these are dependent on the shape, angular velocity of spin, and apparent wind speed experienced by the rotor. In the case of kites, they CL and CD values are dependent on the shape, angle of attack and apparent wind speed. These values can be calculated experimentally, but for very simple shapes can be simply calculated. There are many example profiles in the literature for kites, one recent profile is in 2014 is shown in Table 51 and plotted in Figure 79. These example figures will be used for modelling a kite system in INOMANS2HIP. Angle of attack (α) [°] Coefficient of Lift (CL) [-] Coefficient of Drag (CD) [-] -5.8 -0.21 0.067 -2.9 -0.06 0.049 0.15 0.200 0.039 2.7 0.464 0.045 5.6 0.720 0.060 8.3 0.898 0.083 11.2 1.030 0.124 12.2 1.060 0.143 13.2 0.996 0.190 14.3 0.640 0.224 15.0 0.925 0.242 Table 51: Coefficients of lift and drag as taken from 2014 example profile Figure 79: Graph of data from Table 51 Figure 80 shows the kite model block created in GES. Figure 80: Kite model block The in- and outputs are defined in Table 52. Type Version INOMAN.1 Help Wind Energy Created Name Gates WIN_Kite2 Fuel type SWBS 0 0 TNO 22-11-2013 Parameters 4 gate # Index Power [In,Out] effort cal unit flow cal unit parameter # name value unit 0 0 Out t func [N] vs [m/s] 0 Travel true wind direction 0 [deg)