Wandeinflüsse auf Gemischbildung und Verbrennung bei kleinvolumigen DI-Dieselmotoren

Leipertz, Alfred; Blumenröder, Kurt; Schünemann, Erik; Peter, Frank; Potz, Detlev

doi:10.1007/bf03226511

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…It is supposed that the jets of the small spray holes impede the wall-jets of the larger holes because of interaction. But the wall-jets enhance the air utilization and the backflow towards the center of the combustion chamber [6]. The gradient of the velocity of the HF400/6?6Hnozzle is lower than the gradient of the HF400/8H-nozzle.…”

Section: Assessing the Air Utilization And The Backflowmentioning

confidence: 96%

“…So with sufficient spray momentum the fuel is reflected by the piston bowl and flows back to the middle of the combustion chamber which leads to higher air entrainment. The vortices support the transport of fuel back towards the middle of the combustion chamber too [6]. These effects can decrease the soot emissions in low load ranges [6][7][8].…”

Section: Mixture Formationmentioning

confidence: 99%

“…The vortices support the transport of fuel back towards the middle of the combustion chamber too [6]. These effects can decrease the soot emissions in low load ranges [6][7][8]. On the other hand the soot emissions can increase if fuel deposits on the wall [9].…”

Section: Mixture Formationmentioning

confidence: 99%

“…The high number of spray holes leads to strong overlapping of the individual wall-jets so no directed flow can be achieved. This can lead to very rich combustion zones with high soot formation [6]. With both 8h-nozzles, the backflow to the center of the combustion chamber already occurs at this time.…”

Section: Nozzle Comparison Hf355/8h-hf355/14h-hf205/ 8hmentioning

confidence: 99%

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Reduction of soot emissions in diesel engines due to increased air utilization by new spray hole configurations

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2016

Automot. Engine Technol.

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With conventional combustion processes there remain unused regions with air between the injection jets. To use these, a 14-hole-nozzle and a nozzle with six smaller and six larger spray hole diameters were developed. Both nozzles show strongly increased soot emissions. The optical analysis shows that the combustion zones of the 14-hole-nozzle overlap and create very rich local combustion zones. Furthermore, the small spray hole diameters reduce the spray momentum and a backflow from the piston bowl which would lead to improved air utilization cannot be created. The small spray holes of the 6?6-nozzle create a spray momentum that is too large to only use the air in the middle of the combustion chamber. At the same time the injection jets restrain the backflow generated by the larger spray holes.

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Section: Assessing the Air Utilization And The Backflowmentioning

confidence: 96%

Section: Mixture Formationmentioning

confidence: 99%