Simulation of a gasoline engine to evaluate the performance and thermal efficiency using different gasoline fuels

• Different fuel types were tested on the same engine. • Improved fuels gave higher engine power than regular fuel. • GS fuel showed the greatest power increase at high speed. • Fuel use was lower when using GS and WM fuels. • Engine efficiency was highest with GS fuel. In this study, the effects of different gasoline fuels are investigated to evaluate the performance and thermal efficiency of the gasoline engine using GT-Power Simulation. The study was conducted on a spark ignition engine, single cylinder, four-stroke (type-Robin EH17), using local gasoline (WA), local enhanced gasoline (WS) and commercial enhanced gasoline (WM) as fuel with constant compression ratio, constant spark timing, and engine speed range between (1200 to 2800 rpm) and at the whole throttle opening (WOT). The Simulation results have been validated against experimental data. The average error percentage in brake torque, brake power, brake specific fuel consumption, and brake thermal efficiency obtained by (5.93%, 5.26%, 5.75%, 5.56%), respectively5.62%. The final results show higher brake torque by about (24%, 20%, 15.23%) with (GS), (WM) and (WS), respectively, at (2800 rpm) compared to (WA) fuel. Also, improved brake power with (WS), (WM) and (GS), with the highest improvement with (GS) fuel by about (26.1%) at speed (2800 rpm). On the other hand, BSFC increased with fuel (WS) by about (5.36%) and decreased with (GS), (WM) by about (11.47%, 6.46%) respectively compared to (WA) fuel at (2800 rpm). In addition, brake thermal efficiency has improved profitability with (WS), (WM), and (GS), resulting in a significant improvement. The higher brake thermal efficiency obtained with (GS) fuel by about (13.45%) compared to (WA) fuel at (2800 rpm). The use of the GT-Power model has thus provided good predictive power for engine performance parameters.