Journal
OPTICS EXPRESS
Volume 23, Issue 26, Pages 33028-33037Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.033028
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Funding
- Romanian National Authority for Scientific Research and Innovation (ANCSI)
- CNCS - UEFISCDI
- Renault Technology Roumanie [PN-II-PT-PCCA-2011-3.2-1040 (58/2012)]
- LAPLAS of ANCSI [PN 09.39.01.01]
- CNCS - UEFISCDI, Romania
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Laser sparks that were built with high-peak power passively Q-switched Nd:YAG/Cr4+:YAG lasers have been used to operate a Renault automobile engine. The design of such a laser spark igniter is discussed. The Nd:YAG/Cr4+:YAG laser delivered pulses with energy of 4 mJ and 0.8-ns duration, corresponding to pulse peak power of 5 MW. The coefficients of variability of maximum pressure (COVPmax) and of indicated mean effective pressure (COVIMEP) and specific emissions like hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and carbon dioxide (CO2) were measured at various engine speeds and high loads. Improved engine stability in terms of COVPmax and COVPmax and decreased emissions of CO and HC were obtained for the engine that was run by laser sparks in comparison with classical ignition by electrical spark plugs. (C)2015 Optical Society of America
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