Effect of adding oxygen to the intake air on a dual-fuel engine performance, emissions, and knock tendency

The addition of oxygen to the intake air, commonly known as oxygen-enrichment, is expected to partially resolve these problems. In the present experimental study, a single-cylinder DI (direct injection) diesel engine has been properly modified to run on dual-fuel mode with natural gas as a main fuel and diesel fuel as a pilot; with the ability to enrich the intake air with variable amounts of oxygen. Comparative results are given for both plain dual-fuel (without oxygen-enrichment), and dual-fuel with different percentages of oxygen-enrichment of the intake air, at different load conditions; revealing the effect of adding oxygen to the intake air on engine performance, emissions, and knock tendency.