The blade efficiency for a turbine cascade is defined as:

For very small ratio of

which is same as the compressor cascade

Nature of variation of wrt mean flow angle

Note: does not vary much in the range provides flexibility in design.

In the above derivation for blade efficiency of both the compressor and turbine cascade, the lift is assumed as , neglecting the effect of drag. With the corrected expression of lift, actual blade efficiencies are as follows: