DESIGN AND EVALUATION OF INTERNAEL COMBUSTION ENGINES PERFORMANCE

Abstract

Operating an internal combustion engines with different values of time, Speed, Compression ratio and temperature needs a lot of work & effort. To have best evaluation of operating processes and engine performance DOE – 9 Expert is used. In designing process time, Number of cycles per minute and compression ratio were input as variable factors and the calculated results of fuel consumption rate, Torque is the response and brake power, the brake thermal efficiency, brake specific fuel consumption, the brake mean effective pressure, the volumetric and mechanical efficiency and the indicated power are the theoretically calculated factors .The first designed experimental work was for combustion engine which worked with gasoline only. Then a 10% of methanol added to gasoline is considered as mixture operating fuel. The DOE – 9 obtained predicted results were compared with the results and showed a good agreement. DOE – 9 perturbation plot show that as speed and mechanical efficiency and brake power increased (10 %).