A numerical investigation of the effect of hydrogen blending on the temperature field and polutants emission of a four stroke spark lgnition engine

Abstract EN

The internal combustion engines are generally a major source of air pollution.

However the spark ignition engines are recognized by their carbon monoxide and unburned hydrocarbon emission.

One of the methods used to reduce the emission of these pollutants is the blending of hydrogen with the gasoline fuel, either on a mass basis or on energy replacement basis.

The present research study is devoted to concern with developing a numerical model to predict the effect of hydrogen blending (based on energy replacement) on the emitted concentrate of carbon and nitrogen oxides and the temporal and local variation of cylinder temperature.

It is found that hydrogen blending improves combustion process by increasing the flame propagation speed and hence increasing maximum cylinder temperature.

The timing of maximum cylinder temperature is also advanced due to hydrogen blending.

It is also found that the hydrogen blending reduces CO and CO2 concentrations and increases NOx concentrations.

It is found that when the hydrogen blending ratio exceeds 20 % the engine performance is deteriorated.