What are the specifications and limitations for the blade curves for Bladegen 10.0? Are they similar or the same as the specifications for Turbogrid .curve data?
We are preparing a reverse engineering methodology for our customers. They have bladed components with very primitive CAD description (or in some case no CAD description at all). In order to get them to simulation we are testing the import of some curves into Bladegen. Using 3d laser scanners we are able to scan one blade (including a part of the hub and shroud). We then manipulate the stl file and are able to get curves for hub, shroud and blade profiles. We are then using the import wizard of Bladegen to read the curves and assign them to hub, shroud and blade profiles. This is the general method that we use.
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The specifications for Bladegen are such that the blade profiles should lie on a surface of revolution and contain a complete loop of points. The specifications are similar to those for Turbogrid .curve data. For Turbogrid, profile curves should lie on surfaces of revolution and the hub and shroud blade profiles should be at most 8% of pitch from hub or shroud, respectively. For Bladegen, you shouldn't import the profiles with tip clearance. You need to project the tip profile to intersect with the shroud/hub. The meridional hub and shroud curves should extend approximately 0.5 to1.0 times the length of the blade chord beyond the leading and trailing edges. They should produce a good orthogonal area or meridional interpolation grid. Blades with high angles of attack or exit angles eg axial fans, can be very difficult to import accurately due to the almost tangential angle with the circumferential directions. |
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