Document Type

Article

Publication Date

2024

Department

Department of Mechanical Engineering-Engineering Mechanics

Abstract

Favorable fuel properties of hydrogen for combustion system opens a new avenue to achieve deep decarbonization in transportation sector. Meanwhile, various technical challenges including low volumetric energy density, nitrogen oxide emissions, and backfire impede successful implementation of hydrogen in combustion engines. To overcome those issues, stratified charge combustion (SCC) is considered to optimize engine performance and emissions. As direct injection approach is utilized in SCC mode, ensuring quality of air-fuel mixing in combustion chamber is crucial. This study aims to understand hydrogen mixing behavior by quantitative measurement on equivalence ratio using laser-induced breakdown spectroscopy (LIBS). This measurement has been conducted under non-reacting conditions, employing realistic injection strategy, multiple injection, so the influences of dwell time, and split ratio are addressed. In addition to LIBS, this study includes a morphological analysis of the hydrogen jet, which was visualized using high-speed schlieren imaging. The experimental data showed that shorter first injection duration was resulted in an increased jet width at the spark plug location, which reduced the equivalence ratio within the center of the jet. Longer dwell time also demonstrated wider jet width at the spark plug location, reducing the equivalence ratio within the center of the jet.

Publisher's Statement

© 2024 The Authors. Published by Elsevier Inc. on behalf of The Combustion Institute. Publisher’s version of record: https://doi.org/10.1016/j.proci.2024.105767

Publication Title

Proceedings of the Combustion Institute

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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