The blade lean angle λ can not be controlled directly. It is influenced by the meridional contour, the meridional extension, the wrap angle and the mean lines. It is calculated on the basis of the length of the quasi-orthogonal lOT and a radius r multiplied with the turning angle φ.  The radius is that at the intersection of the quasi-orthogonal and the outer span. In the case given below this span is the shroud.

 

With an example of a compressor some means for the manipulation of the blade lean angle are given:

 

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