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Creating a blade cutback in Autoblade

JosephSmith

Good day,

I am currently parametrizing an impeller blade geometry in Autoblade. I would like to shift the hub leading edge coordinate, denoted by B, along the base of the blade to point C as per image 1.



This operation would be an attempt to replicate the cutback angle performed in CAD, shown by image 2,3 and 4.




I attempted to replicate the cutback angle effect in Autoblade by shifting the hub leading edge coordinate in the meridional view. However this results in moving coordinate B radially closer to the axis of rotation like the image below:

instead of smoothly along the blade. This is shown by the upstream leading edge shift in the meridional views of images 5/6.

 

Ideally, point B should follow the curvature of blade however this was not the case. I believe I am missing an aspect in this regard to fully replicate the CAD cutback operation in Autoblade. In this regard, I would like to know if such an operation is possible

Thanks



  • 0

    Dear JosephSmith, 

    Shifting the hub leading edge coordinate in the meridional view is a good idea but you have to combine it by moving an other parameters, the refence tangential location. 

    What I recommend you is playing with: 

    • Hub leading edge in the meridional view (this is what you have done)
    • Playing with the value of this reference tangential location of the leading edge at section 1 (hub)

    You can observe the modification by plotting the parameter theta as a function of the mean_line_length_fraction 

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