Question

INTERNAL COMBUSTION ENGINES Practice Problems ME 436 A 3 cylinder, 2.7 liter SI engine operates on a 4 stroke cycle at 3300 RPM with a compression ratio of 8.6:1. At the start of the compression stroke, the temperature is 47°C and the pressure is 82kPa. Assume 3% residual gases. The mechanical efficiency is 81%, combustion efficiency is 96%, and the air-fuel ratio is 16.3, and the fuel heating value is 43,000 kJ/kg. The combustion process starts at TDC and is finished 18° 2TDC. The rod to crank-offset ratio is 8:1 Calculate: a) the crank offset length (m), assume a square engine (B=S) b) the clearance volume per cylinder (m3 c) the volumetric efficiency of the engine (%) d) the rate of air flow into the engine, (kg/s) e) the brake power produced by the entire engine, (kW) Hint: calculate the states of the cycle f the torque produced by the entire engine (N-m) g) the brake specific fuel consumption (g/kWh) h) the indicated mean effective pressure (kPa) i the total time of combustion (s) j) the distance the piston has moved during the combustion process (m)

Answer 1