Define "Degree of Reaction" used in reaction turbine

Prove that diagram efficiency of single stage reaction turbine is given by

$ɳ_{b1}$ = 2 - $\frac{2}{(1+2ρcosα-$ρ^2$)}$

where DOR = 50%, & $C_{f1}$ = $C_{f0}$ , ρ is blade speed ratio, α is nozzle angle.

Subject : Thermal and Fluid Power Engineering

Topic : Steam Nozzle and Turbines

Difficulty : High

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