The performance of a turbocharged diesel engine is approximated by the limited pressure cycle. The compression ratio of the engine is 15.5, and the heat added to the cycle is 1900 kJ/kg. The inlet conditions are p1 = 160 kPa and T1 = 320 K. Assume that gamma= 1.3 and R = 0.287 kJ/kg-K. a. Assuming that half of the total heat is added at constant volume and half at constant pressure, calculate the indicated thermal efficiency of the cycle. b. Compare the efficiency and peak pressure of the limited pressure cycle with the efficiency and peak pressure that would be obtained if the same total heat were added at constant volume or at constant pressure. 2 c. Calculate the indicated thermal efficiency of the limited pressure cycle for a new compression ratio of 16.5, keeping everything else the same. How did the change in compression ratio affect efficiency?
