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Experimental investigation on the influence of passive/active pre-chamber injection strategy on the hydrogen knock limit

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.

Topic: Engine testing and modeling

Author: D. Mielcarzewicz

Co-authors: F. Szwajca, I. Pielecha

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Experimental investigation on the influence of passive/active pre-chamber injection strategy on the hydrogen knock limit