Abstract
ABSTRACT The residual gas xr affects the number of moles of unburned mixture. Consequently it affects the mixture's molecular mass, specific heats, gas constant, internal energy and enthalpy of formation and entropy. Its magnitude affects volumetric efficiency and engine torque and power directly, whereas thermal efficiency and emissions are affected by the change in thermodynamic properties of the working fluid. A parametric study covers the variables which affect xr namely compression ratio,equivalence ratio φ, inlet air temperature Ti, ratio of exhaust and intake pressures pc/pi, and fuel. A computer program was devised to calculate xr,Tr, Tl and specific heat release, and the consequent performance namely power, ηth and bmep. Results show the relative importance of the parameters such as rc,φ, pc/pi and fuel type on residual gas particulars, and fuel on power and ηth whereas for bmep the pc/pi acquires additional importance.
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