A piston-cylinder arrangement operates on an air-standard cycle composed of the following four processes:
(1-2) An isentropic-compression process that compresses air from 100 kPa and 20°C to a pressure of 800 kPa
(2 -3) A constant-volume combustion process that increases the pressure to 6.4 MPa and the temperature to 1800°C
(3-4) An isentropic process that reduces the pressure to 800 kPa
(4-1) A constant-volume process that reduces the pressure back to 100 kPa to complete the cycle
Sketch the cycle on P-v and T-s diagrams. Using the ideal-gas relationships developed in Chapter 3 assuming constant specific heats, calculate the work output and heat input for this cycle. What is its efficiency?