The following data refer to an analysis of a dual combustion cycle with a gas having specific heats varying linearly with temperature:
The pressure and temperature of the gas at the end of compression are 31 bar and 227 °C respectively; the maximum pressure achieved during the cycle is 62 bar, while the maximum temperature achieved is 1700
C.
The temperature at the end of the expansion stroke is 1240 °C. The increases in entropy during constant volume and constant pressure combustion are 0.882 and 1.450 kJ/kg K respectively. Assuming that the fluid behaves as an ideal gas of molecular weight, mw - 30.5 calculate the equations for the specific heats, and also the expansion ratio if that process is isentropic.