Abstract
At this time, the severe legislation regarding the level limits of the waste and exhaust gases released by thermal engines and also the necessity of engines efficiency improvement boost the engine research domain to bring in front the use of new technologies that can be used to control the in-cylinder combustion process. Now, the new technologies is represented by LASER spark plug systems which can be successfully used at petrol engines. LASER spark plug technology can have many advantages for engine operation control, an ignition system that could provide improved combustion is the one using plasma generation and a Q-switched LASER that results in pulses with high MW power. The LASER spark plug device used in the current research was a LASER medium Nd:YAG/Cr4+:YAG ceramic structure made up of a 8.0-mm long, 1.0-at.% Nd:YAG ceramic, optically-bonded to a Cr4+:YAG c. It was developed and constructed similar to classical spark plug and could be assembled on a CFR Octane Rating Unit Engine as well as on a Dacia Single Cylinder SI Engine which led to several results among which: influences on in-cylinder pressure, combustion and pollutant emissions.
Highlights
Internal combustion engines are extremely important in transportation and energy production any improvement will lead to a substantial decrease in pollutants and greenhouse gases
The four graphs present the external outlines of the curves for the indicated pressure as well as the maximum values related to the upper and lower external outlines, respectively
The graphs in figures 4a and 4b highlight the existence of several maximum values which are slightly higher in the case of the LASER spark plug (22.4-26.9 bar) compared to those of the classical spark plug (22.0-26.3 bar) for a stoichiometric mix ( =1.0)
Summary
Internal combustion engines are extremely important in transportation and energy production any improvement will lead to a substantial decrease in pollutants and greenhouse gases. For several years researchers have been intent on finding a LASER based ignition source [2], which can replace a classical spark plug with a pulse focused LASER beam and they attempted to control ignition by a LASER source [3]. Laser spark plug systems are intended to protect resources and the decrease CO2 emissions limiting the greenhouse effect. It could be obtained through lower fuel consumption achieved by the spark ignition (SI) engine system, owing to high thermodynamic capacity resulting from direct injection. Several other ignition systems apart from LASER spark plug are reviewed [4] such as microwave ignition and high frequency ignition
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