A four cylinder CI engine has a four-stroke cycle operates at the condition shown in table T= Torque r = compression ratio n = mechanical efficiency Te combustion efficiency L= connecting rod length QLHV = lower heating value B = cylinder bore AFR = air fuel P = cylinder pressure T = cylinder temperature Calculate the: 1- Average piston speed Piston speed at the end of combustion (The combustion ends 7- Brake thermal efficiency at a crank angle, 0) 3- Piston traveled distance from the TDC 4- Combustion chamber Volume at the end of combustion 5- Brake mean effective pressure N.rpm 1000 1100 Q2: Assume that the engine in problem one operates on the air - standard Dual cycle and 60% from the heat input is added at constant volume and 40% at constant pressure, Calculate: 1- The net work 2-The indicated thermal efficiency Te L,cm B,mm , deg. T.N.m 18 15 85 35 18.5 15.5 90 40 6- Work per unit mass of gas in the cylinder 5 10 8- Brake specific fuel consumption 9- Volumetric efficiency Vd, m P.kPa T, C m.% 0.00035 85 0.0005 85 95 100 21 22 Q.LHV, MJ/kg 43 43 nc.% AFR 98 98 16 15