Effects of hydrogen and methane addition on combustion characteristics, emissions, and performance of a CI engine

Journal article

Authors/Editors

SOMCHAI WONGWISES

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Publication Details

Author list: Karag๖z Y., G�ler I., SandalcI T., Y�ksek L., Dalkili็ A.S., Wongwises S.

Publisher: Elsevier

Publication year: 2016

Journal: International Journal of Hydrogen Energy (0360-3199)

Volume number: 41

Issue number: 2

Start page: 1313

End page: 1325

Number of pages: 13

ISSN: 0360-3199

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955613647&doi=10.1016%2fj.ijhydene.2015.11.112&partnerID=40&md5=21931a501563d0e67d0c32da358b5c75

Languages: English-Great Britain (EN-GB)

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Abstract

In this study, while a hydrogen + methane mixture in the gas phase (30% H2 + 70% CH4 in moles) is injected from an intake port by a gas injector, ignition is supplied with diesel fuel sprayed from a diesel injector. The energy content of the sprayed gas fuel is modified to constitute 0% (only diesel fuel), 15%, 40%, and 75% of the total fuel energy content. All tests are conducted at 1500 rpm stable engine speed and in full-load condition. The effects of energy content modification of hydrogen + methane gas fuel on engine performance, emissions, and combustion are observed. Both NOx and soot emissions are taken under control with 15% and 40% energy content rates in the gas fuel compared to the diesel-only condition. Although an increase is observed in CO and THC emissions with gas fuel addition compared to the diesel-only condition, an improvement is considered compared to the results obtained for only methane fuel usage with diesel fuel. Moreover, gas fuel mixtures reach a high value (75% energy content) as peak cylinder gas pressure decreases. A single-phase heat release was observed, and the diesel combustion characteristic of the engine was converted into gasoline combustion with the addition of 75% hydrogen + methane as the energy basis. ฉ 2015 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Keywords

Diesel engine, NOx, Smoke, THC