Find the required air-fuel ratio in a gas turbine whose turbine and compressor efficiency are 85% and 80% respectively. The maximum cycle temperature is 875 C. The working fluid can be taken as air (cp = 1.00 kJ/kg.K and ϒ = 1.4) which enters the compressor at 1 atm and 27 C. The pressure ratio is 4. The fuel used has a calorific value of 42000 kJ/kg. There is a loss of 10% of calorific value in the combustion chamber.
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