Читать книгу Internal Combustion Engines - Allan T. Kirkpatrick - Страница 26

A six‐cylinder, four‐stroke automobile engine is being designed to produce 75 kW at 2000 rpm with a bsfc of 260 g/kWh and a bmep of 9.2 bar (920 kPa). The engine is to have equal bore and stroke, and will be fueled with a stoichiometric mixture of gasoline and air with an air–fuel ratio (AF) of 15.27. Gasoline has a heat of combustion = 44,510 kJ/kg. (a) What is the design displacement volume and bore ? (b) What is the mean piston speed at the design point? (c) What are the cycle average fuel flow and air flowrates and the fuel consumption per cycle per cylinder? (d) What is the work per cycle per cylinder? (e) What is the thermal efficiency?