[karwendel]

Dear all,


I am having troubles creating the shape of the LE and TE of my blade. I chose the option Main Blade>Side Curves>Edge Control>LE Shape>Elliptical (Internal). I picked Internal since I don't want the camber length to change.



The Problem is that the programm does not fit the elliptical nicely/gradient-steadily into the suction side and when I check the side metallic angels on Geometry Analysis I see a kink/bump at ca. 2% norm. mean_line_length_fraction (see file). That is where the edge blends into the suction side. The problem gets worse the "blunter" the blade gets and better the sharper the blade gets.



P.s.: When I chose round (build in) and define the radius and half wedge angle of the blade, I get nowhere close to how the edge should look like in the end...


Has anyone had the same problem? Any advise?


The last option would be to import the geomTurbo into python or matlab and change the the points there manually but that seems to be an extensive work to change approx 5 points per section....

[Hamidzoka]

Hi,
Generating a precise parametric model can be a time-consuming task.
You need to examine different parametrization techniques with different number of defining points to find the best configuration.
By default, stacking lines in Autoblade are of radial type. However, this does not work for some types of blades. So ,as a test, you can change them (both sweep and lean curves) from simple radial lines to more sophisticated curves such as B-Slines. This may help.
Do not forget to examine different parametrization strategies like regular, legacy, thickness distributions,...

regards