Exhaust gas recirculation

Combustion

Physics

Engineering

Mean effective pressure

Diesel fuel

Ignition system

Hydrogen fuel enhancement

Automotive engineering

Organic chemistry

Chemistry

Materials science

Compression ratio

Diesel engine

Inlet manifold

Environmental science

Internal combustion engine

Hydrogen

Hydrogen fuel

Thermodynamics

International Journal of Hydrogen Energy

The paper presents experimental studies of a dual-fuel diesel engine which was fueled by diesel fuel in to the cylinder and hydrogen to the intake manifold. The effect of co-combustion of hydrogen and diesel fuel on the stability, performance and exhaust gas emission of the test engine was studied. The energy share of hydrogen co-combusted with diesel was changed in the range from 0 (D100) to 30% (DH30). Increasing the hydrogen energy share to 30% in a compression-ignition engine operating at full load resulted in an increase in the maximum combustion pressure (by 13%), the rate of heat release (by 46%) and the rate of pressure rise (by 35%). The addition of hydrogen, due to the increase of the combustion rate and shortening of the total duration of this process, caused an increase in efficiency, by a maximum of 17% for DH14 and DH25. For DH30 there was a significant decrease in engine stability, confirmed mainly by the determined value of the coefficient of covariance in the indicated mean effective pressure. The addition of hydrogen to a compression-ignition engine, up to 25%, resulted in a significant, almost 85% reduction in soot emissions, an almost 57% reduction in carbon monoxide, and an almost 27% reduction in carbon dioxide. The disadvantage of using hydrogen as a fuel for a compression-ignition engine was increase in HC emissions and a significant increase in NO emissions (by over 80% for DH30).

Hydrogen effects on combustion stability, performance and emission of diesel engine