Derive the expression for the minimum blade efficiency of an impulse steam turbine
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The energy supplied per stage of an impulse turbine is equal to kinetic energy given by ηb=ṁC2i2 and assuming that the kinetic energy leaving the stage is wasted. Blade efficiency will be maximum when C0 (Absolute velocity of steam at exit to moving blades) is minimum, that is, when β=90o, or the discharge is axial.
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