Ignition of a large stationary natural gas engine by high-peak power passively Q-switched Nd:YAG/Cr⁴⁺:YAG laser spark plugs

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Beckert, Erik ; Kraze, Felix ; Tünnermann, Andreas ; Schröder, Lukas ; Geiger, Mirko ; Brüggemann, Dieter ; Rickert, Andreas ; Kusgörd, Jan ; Warkentin, Paul ; Grigore, Oana-Valeria ; Pavel, Nicolaie:
Ignition of a large stationary natural gas engine by high-peak power passively Q-switched Nd:YAG/Cr⁴⁺:YAG laser spark plugs.
In: Optics Express. Bd. 33 (2025) Heft 22 . - S. 46944-46955.
ISSN 1094-4087
DOI: https://doi.org/10.1364/OE.575912

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Abstract

A high-power large stationary natural gas engine was operated with the help of compact laser ignitors. The laser devices, employing high-peak power passively Q-switched composite Nd:YAG/Cr4+:YAG ceramic media with monolithic resonators, were designed for both pre-chamber and direct ignition configurations. The maximum cylinder pressures and their cycle-to-cycle variability (expressed as the coefficient of variation of the maximum pressure) were evaluated at nominal engine operating powers of 200 kW and 250 kW, as well as at a higher output of 275 kW. Under nominal operating conditions, including lean fuel-air mixtures near the misfire limit, the laser spark plug with pre-chamber achieved higher maximum pressures and showed either improved combustion stability at 200 kW or comparable to that at 250 kW relative to the pre-chambered electric spark plug. Furthermore, long-term endurance testing over several hours yielded encouraging results, supporting the viability of laser ignition technology for high-power natural gas engines.