Features of two types of injection system, central- and side-injection systems, were compared, as to the effective use of air in the combustion chamber, that is, the optimization of swirl intensity and injection nozzle specifications coupled with combustion chamber shapes. In the present report, various factors affecting the optimum swirl intensity were examined by making use of the specially designed two-stroke-cycle test engine, in which swirl intensity could be altered during engine operation with 'variable angle swirler' installed around scavenging ports. Combustion performance of various typed combustion chambers were clarified for both injection systems. In the central-injection combustion, a new concept of relative swirl intensity defined with the geometrical configuration of injected jets and the motion of air swirl, were successfully applied to quantitative evaluation of the optimum swirl intensity. When combustion characteristics for marine diesel oil are compared with those for the bunker fuel oil, use of the latter was easy to get into the overswirl state at relatively lower intensity. In the side-injection combustion, it was recognized necessary to give a higher swirl intensity than in the central-injection combustion. Therefore, acceleration of swirl during compression stroke plays an important role in this combustion system.
Influences of air swirl on fuel spray combustion in a marine diesel engine
Einfluss der Luftverwirbelung auf Gemischbildung und Verbrennung in einem Schiffsdieselmotor
1985
26 Seiten, 21 Bilder, 4 Tabellen, 7 Quellen
(not foliated)
Conference paper
English
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