Abstract

A prior paper has presented a novel design of a heavy-duty truck engine fueled with H2. in this design, the customary in-cylinder Diesel injector and glow plug are replaced with a main chamber fuel injector and a jet ignition pre-chamber. the jet ignition pre-chamber is a small volume that is connected to the in-cylinder through calibrated orifices accommodating another fuel injector and a glow or a spark plug that controls the start of combustion. This design permits to operate the engine in four different modes: traditional compression ignition (CI), diffusion, Diesel-like (M1); mixed gasoline/Diesel-like (M2); traditional spark ignition (SI), premixed, gasoline-like (M3); premixed, homogeneous charge compression ignition HCCI-like (M4). in the mode diffusion with jet ignition (M1), an injection occurs in the jet ignition pre-chamber before the main chamber fuel is injected and the engine operates therefore mostly Diesel-like. in the mode mixed diffusion/premixed Diesel/gasoline-like (M 2) an injection occurs in the jet ignition pre-chamber after only part of the main chamber fuel is injected and mixed with air. in the mode premixed with jet ignition (M3), an injection occurs in the jet ignition pre-chamber after the main chamber fuel is injected and mixed with air and the engine operates gasoline-like. Finally, in the mode premixed without jet ignition (M4), no injection occurs in the jet ignition pre-chamber and the engine operates HCCI-like. Modelling results have already been presented and discussed with H2 as the main chamber and pre-chamber fuel. This paper considers the option to accommodate a second main chamber injector that will inject the NH3 that will then burn in air thanks to the hot combusting gases from the combustion of H2 and air using the modes M1 and M2 described above. the mode M3 also of interest is not considered here. First results of simulations show the opportunity to achieve better than Diesel fuel energy conversion efficiency thanks to the reduced heat losses of the "cold burning" NH3 and suggest performing the experiments needed to further support the findings. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Compression ignition; Dual fuel operation; H fuel 2; Jet ignition; NH fuel 3; Spark ignition

International Standard Serial Number (ISSN)

0360-3199

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 May 2012

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