Answer Happy

A single-cylinder spark ignition cycle engine with a compression ratio r = 10 is operated at full throttle. The initial cylinder pressure and temperature at bottom dead center are P₁ = 1 bar and T₁ = 300 K. The bore and stroke of the engine are b = 80 mm and s = 90 mm, with the top dead center area/volume ratio Ao/Vo = 320 m¹. The average cylinder wall temperature Tw = 400 K. The total heat addition, Qin = 2000 J, the start of combustion is at 0, -15° and the combustion duration 0 = 40°. Assume that the ideal gas specific heat ratio y = 1.4, the Wiebe energy release parameters are a = 5 and n = 3 and the blowby mass loss coefficient c = 0.70. Using the program WoschniHeatTransfer.m (modify where necessary): = a) Find the imep and thermal efficiency b) Plot the instantaneous heat transfer coefficient h₂(0), the heat flux q" to the cylinder wall, and the cylinder pressure P as a function of crank angle. c) Discuss and conclude your findings.