Читать книгу Internal Combustion Engines - Allan T. Kirkpatrick - Страница 48

The operation of a single‐cylinder engine with a compression ratio = 8 is to be modeled using an Otto cycle. The engine is fueled with octane and operates at a lean air–fuel ratio of 17:1. At the beginning of compression at bottom dead center, the cylinder pressure = 100 kPa and temperature = 320 K. Assume the cycle average = 0.29 kJ/kg‐K and = 1.26. (a) What is the nondimensional energy addition and the cycle average specific heats and , (b) What is the thermal efficiency and imep/, and (c) What is the maximum temperature and pressure ?