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Combustion and emissions of a hydrogen-ammonia mixture engine with passive and active turbulent jet ignition
1
Doctoral School of Faculty of Civil and Transport Engineering, Poznan University of Technology, Poland
2
Faculty of Civil and Transport Engineering, Poznan University of Technology, Poland
These authors had equal contribution to this work
Submission date: 2026-02-07
Final revision date: 2026-05-24
Acceptance date: 2026-05-29
Online publication date: 2026-06-23
Corresponding author
Ireneusz Pielecha
Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3 street, 61-131, Poznań, Poland
Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3 street, 61-131, Poznań, Poland
KEYWORDS
TOPICS
ABSTRACT
The search for fossil fuel substitutes has led to the adoption of carbon-free solutions, including hydrogen and ammonia. It is also possible to use mixtures of both these fuels. Due to their different physical and chemical properties, the combustion processes of hydrogen and ammonia differ. The paper describes research on hydrogen and hydrogen-ammonia mixture combustion in the AVL 5804 engine. The engine is equipped with a two-stage combustion system with a passive and active prechamber. During the study, an indicator analysis of the combustion process in the prechamber and main chamber was performed. The study also included an evaluation of changes in hydrogen and nitrogen oxides concentrations, as well as changes in the number of particulate matter particles in the exhaust gases. By comparing the combustion of hydrogen and hydrogen-ammonia mixtures, it was observed that the thermodynamic parameters of the combustion process changed, along with emissions of unburned hydrogen and nitrogen oxides. However, there were insignificant differences in the number of particulate matter.
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