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Found 3 results

  1. HI everyone, I'm having a hard time. I created the blades and tips. As shown in Fig. However, when I create the propeller with Model-propeller-propller, I only get incomplete blades. The tips were not created together. This is shown in the image below. Also, due to the language, I may have a problem with the description not being clear, so please forgive me. Looking forward to your answer. prop_para.cdbc
  2. Hi all, for viscous flow computations it is necessary to have a watertight geometry. For this reason I created two features which closes the blade tip of the blades which were created with our blade engine. 1. Feature: I created a fillet curve above the blade gap with the fillet curve I created a lofted surface which closes the gap 2. Feature: I created a nurbs curve which depends on the fillet curve from the 1. Feature the two inner points of the nurbs curve are located on the fillet curveyou can change both the position of the points onto the fillet curve and the weights of the points with the nurbs curve I created a lofted surface which closes the gap so you have more control over the surface shape but also you do not have a tangential transition between the blade surface and the tip surfaceIf you are interested in viscous flow computations with our blade/propeller definition please give feedback to these features if it work good or not. I think I will improve the method within the next days (or weeks). Cheers Matthias closedBladeTip.fdf closedBladeTipNurbs.fdf
  3. Hi all, attached is an example of a wind turbine. This surface model is based on empiric [burton, 2011. Wind Energy handbook] radial distribution of chord and pitch, which are dependend by the Design Angle of Attack (AOA)Lift CoefficientRadiusTip Speed RatioThe Lift Coefficient can be determined, by empiric equations (0.1*(AOA+4°)[burton,2011]), taken from tables or can be determined with other ways. The Profile based on a cambered NACA-4ds. The Tip Speed Ratio is given by (Pi*D*n_R/v_w), where n_R is the rotational speed, and v_w the design wind velocity. The angle of the rotation can be varied as well, to avoid contact of the blades with the shaft in stormy conditions. A design attribute of this wind turbine is, that the maximum chord length is modeled up to the hub, which should enlarge the total power coefficient, because of less speration losses. This is reached with a little stationary wing part at the hub, where the design pitch angle should be that from the design wind velocity and tip speed ratio. Furthermore this example shows tip and subsurface modulation. WindTurbine.fdb
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