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This is problem 5-13 from El-Wakil’s Powerplant Technology book -- a 50 percent reaction stage in...

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Mechanical Engineering

This is problem 5-13 from El-Wakil’s Powerplant Technology book-- a 50 percent reaction stage in a steam turbine undergoes a totalof 20 Btu/lbm enthalpy drop. The nozzle efficiency andangle are 88 percent and 25°, respectively. The blades move at 420ft/s and have Vr1 = 332 ft/s, Vs2 = 386 ft/s,and ? = 22°. The steam flow is 1.08x106lbm/h. Find (a) the work done by the stage in horsepowerand megawatts, (b) the blade efficiency, (c) the stage (nozzle andblade) efficiency, and (d) the blade velocity corresponding tomaximum efficiency, in feet per second.

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