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Experimental investigation on the influence of passive/active pre-chamber
injection strategy on the hydrogen knock limit
1
, Poland
These authors had equal contribution to this work
Submission date: 2025-05-09
Final revision date: 2025-06-18
Acceptance date: 2025-06-20
Online publication date: 2025-07-07
Corresponding author
Ireneusz Pielecha
Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3 street, 60-965, Poznań, Poland
Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3 street, 60-965, Poznań, Poland
KEYWORDS
TOPICS
ABSTRACT
Hydrogen combustion in an engine is related to the high speed of the process, the wide variability of the excess air ratio, and the high intensity of knock combustion. This paper presents analyses of knock combustion in a TJI engine under passive and active pre-chamber fuelling. The tests were conducted on a single-cylinder AVL 5804 test engine at n = 1500 rpm and medium load (IMEP = 3–4 bar). Attention was focused on the knock indicator – MAPO at different excess air ratio values. The possibilities of reducing this phenomenon in the TJI engine during different pre-chamber fuel injection strategies and at different excess air ratio values are presented. The probability of knock occurrence was determined cycle by cycle for several combustion cases (including a further 2 to 5 engine cycles). The paper shows that knock occurs differently in the main chamber and pre-chamber when the engine is actively or passively fed.
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