Sine rule

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Sine rule

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[ Turbine rotors only ]

With the help of the sine rule blade angles at the outlet can be evaluated. In accordance to this rule blade angles at the outlet should have almost the same size as the angle that is built by a hypotenuse being the pitch t, and a cathetus (opposite leg) being the smallest distance between two neighboring mean lines eq at a flow surface. If this is the case  the outflow can be regarded as almost tangential to the trailing edge.

This is shown in a picture for a single mean line.