An open gas turbine is equipped with a regenerator. The compressor is 87% efficient with air entering the compressor at 290K and 100kPa. The pressure ratio is 8. The maximum allowable temperature entering the turbine is 1400K. The turbine exhausts to the regenerator, with an effectiveness of 60% at 100kPa. The isentropic efficiency of the turbine is 90%. Using variable specific heats,
Determine:
a. The fuel/air ratio
b. The temperature entering the combustion chamber
c. The thermal efficiency of the cycle
d. The temperature of the products of combustion leaving the regenerator
e. The thermal efficiency if the regenerator had not been included
Assume a fuel with a heating value of 43,000kJ/kg and the combustion products are similar to those of 400% theoretical air.