Improvements in thermal efficiency and exhaust emissions with ozone addition in a natural gas-diesel dual fuel engine

Author:

Kobashi Yoshimitsu1ORCID,Inagaki Ryuya2,Shibata Gen2ORCID,Ogawa Hideyuki2ORCID

Affiliation:

1. Faculty of Natural Science and Technology, Okayama University, Okayama, Japan

2. Division of Energy and Environmental Systems, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido, Japan

Abstract

Here, ozone (O3) was introduced into the intake air in a natural gas fueled engine ignited by diesel fuel, a natural gas–diesel dual fuel engine, to utilize the reactive O-radicals decomposed from the O3 for the promotion of the ignition and for improvements in the thermal efficiency and exhaust emissions. The engine experiments were performed over a range of equivalence ratios of the natural gas in a single cylinder engine. The timing of the pilot injection of the diesel fuel was varied from early in the compression stroke to near top dead center to examine the changes in the effects of the O3 addition on the ignition and combustion with the pilot injection timing while varying the O3 concentration. The results showed that the combination of the O3 addition and the early pilot injection is a means to improve the thermal efficiency and unburned emissions with a small amount of O3. Further, the improvement in the thermal efficiency and the reduction of the unburned hydrocarbons with the O3 addition are more pronounced for lower equivalence ratios of natural gas, while the O3 addition has a limited effect on the thermal efficiency and the unburned hydrocarbons for higher equivalence ratios of the natural gas.

Funder

japan society for the promotion of science

Publisher

SAGE Publications

Subject

Mechanical Engineering,Ocean Engineering,Aerospace Engineering,Automotive Engineering

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Improvement in Oxy-fuel Combustion of SI Engine Fueled by Natural Gas;SAE Technical Paper Series;2023-09-29

2. Special issue on COMODIA 2022;International Journal of Engine Research;2023-08-31

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