Abstract With conventional combustion processes there remain unused regions with air between the injection jets. To utilize these a 14-hole nozzle and a nozzle with 6 smaller and 6 larger spray hole diameters were developed. Both nozzles show strongly increased soot emissions. The optical analyses reveal improved air utilization during the main injection which leads to higher local combustion temperatures for both. The higher temperatures support the soot formation. In the later stages of the combustion the new nozzles show poorer air utilization than the references. The reference nozzles show a distinct backflow of the combustion from the piston bowl which improves the air utilization and support the soot oxidation. With the new nozzles this is less developed because of a lower spray momentum due to the smaller spray hole diameters.
Effects of new nozzle hole configurations on air utilization and soot emissions of diesel engines
2016-01-01
19 pages
Article/Chapter (Book)
Electronic Resource
English
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