Effect of hydrogen mole fraction and air-fuel distribution of hydrogen-methane blend on SI engine performance

The effect of the Hydrogen mole fraction and the air-fuel distribution of the Hydrogen-methane blend on the SI engine performance is studied in the present work. Presented model was validated with experimental data for the natural gas at the lean condition and was generalized to predict the engine performance for hydrogen-methane blends for a variety of hydrogen contents. Results showed that the charge stratification improved the engine performance by increasing the indicated mean effective pressure and decreasing the specific fuel consumption. The effect of the hydrogen mole fraction was also investigated. Results indicated that increasing mole fraction of the hydrogen content would improve the stratification effect on the engine performance. An advantage of presented model was its flexibility and simplicity that made it possible to investigate several effects، such as the mixture distribution and fuel constituents on the engine performance more practical than other types of the simulation.