When a diesel engine, originally designed to be naturally aspirated, is turbocharged the fuel lair equivalence ratio 4 at full load must be reduced to maintain the maximum cylinder pressure...

When a diesel engine, originally designed to be naturally aspirated, is turbocharged the fuel lair equivalence ratio 4 at full load must be reduced to maintain the maximum cylinder pressure essentially constant. If the naturally aspirated engine was deslgned for 4 = 0.75 at full load, estimate the maximum permissible value of 4 for the turbocharged engine at full load if the air pressure at the engine inlet is 1.6 atm. Assume that the engine can be modeled with the limited-pressure cycle, with half the injected fuel burned at constant volume and half at constant pressure. The compression ratio is 16. The fuel heating value is 42.5 MJ/kg fuel. Assume y = cp/c_D
= 1.35, that the air temperature at the start of compression is 325 K, and (FIA) ,,, , = 0.0666.