Question 11.12: (a) Why are the back work ratios relatively high in gas turb...
(a) Why are the back work ratios relatively high in gas turbine plants compared to those of steam power plants ?
(b) In a gas turbine plant compression is carried out in two stages with perfect intercooling and expansion in one stage turbine. If the maximum temperature (T _{max} K) and minimum temperature (T _{min} K) in the cycle remain constant, show that for maximum specific output of the plant, the optimum overall pressure ratio is given by
where γ = Adiabatic index ; η_{T} = Isentropic efficiency of the turbine.
η_{C} = Isentropic efficiency of compressor. (AMIE Summer, 2005)
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