The matching of fuel, air, and combustion chamber influences the combustion process of diesel engines greatly. The swirl chamber diesel engine has low NOx emission, low noise, and good high speed. Proper spray impingement is believed to be an effective method to improve fuel/air mixture formation quality. By using proper impingement, the vaporization rate of the spray can be increased, because the droplets can second be atomized, and the spray can be diffused more widely. Near the end of the compression stroke, the strong air motion generated by squish can also enhance the fuel/air mixing rate, and at the start of the expansion stroke, reverse squish can enhance combustion rate. In order to improve fuel/air mixture homogeneity and enhance air motion in the combustion chamber, a new spray impingement and squish combustion system (SISCS) is developed. The mixture formation and combustion processes in three different combustion chambers are simulated using the AVL-FIRE code. Simulation results show that the passage width has great influence on combustion and emissions. The characteristics of the SISCS are summarized as follows. 1. The strong squish and swirl obtained by SISCS can improve mixture formation and enhance mixture homogeneity in a new combustion chamber. 2. The high central pedestal and annular passage can accelerate air motion, which is in favour of forming squish and reverse-squish. 3. Both NO and soot emissions in the new combustion chamber B are less than that of the original engine. 4. The passage width has a great influence on combustion and emissions. There is also an optimal intensity of squish to reduce emissions.
Study of spray impingement and a squish combustion system for diesel engines
Untersuchung des Strahlimpulses und Quetschwirbel-Verbrennungssystems für Dieselmotoren
2010
8 Seiten, 9 Bilder, 2 Tabellen, 20 Quellen
Article (Journal)
English
Anwendung im Motorenbau , Kraftfahrzeugmotor , Dieselmotor , Abgasemission , Abgaszusammensetzung , Gemischbildung , Sprühverbrennung , Wirbelströmung , Strömungstechnik , Einspritzanlage , Studie (Untersuchung) , CFD-Modell , numerische Simulation , Wirbelkammer , Turbulenzmodell , Turbulenzmodellierung
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