Experimental and Numerical Analysis of Direct Injection Process for Hydrogen-Fuelled Internal Combustion Engines Politecnico di Torino

Format:

Book

Conference/Event

Author/Creator:

Pucillo, Francesco, author.

Contributor:

Giordana, Sergio

Millo, Federico

Piano, Andrea

Rapetto, Nicola

Vargiu, Luca

Conference Name:

2025 Stuttgart International Symposium (2025-07-02 : Stuttgart, Germany)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

In the context of the clean transport sector, there has been growing interest in the use of hydrogen in internal combustion engines due to its potential to nearly eliminate all engine-out criteria pollutants, while maintaining high thermal efficiency through the use of a lean combustion process. In direct injection configurations, mixing process is significantly influenced by hydrogen jet dynamics. First, a comprehensive experimental campaign was conducted in a constant volume vessel to assess the performance of a hydrogen injector using the Schlieren technique. The jet behavior was analyzed by varying injector recess, injection pressure, and back pressure. Subsequently, the case study was replicated in a 3D Computational Fluid Dynamics (CFD) environment, addressing the complexities associated with modeling under-expanded jets. The model was first validated against experimental data, both in terms of jet morphology and through three geometric indices. Then, a simplified simulation approach was developed to significantly reduce computational effort while maintaining the reliability of the results. Among the analyzed parameters, injector recess was found to have the greatest influence on the jet shape and its evolution inside the chamber

Notes:

Vendor supplied data

Publisher Number:

2025-01-0307

Access Restriction:

Restricted for use by site license