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Variations in piston second land pressure as a function of ring gap position
Scania CV AB.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
2010 (English)In: International Journal of Engine Research, ISSN 1468-0874, Vol. 11, no 2, 153-161 p.Article in journal (Refereed) Published
Abstract [en]

The inter-ring pressure and the potential reverse blow-by flow that can drive oil towards the combustion chamber can strongly influence the in-cylinder oil consumption in diesel engines. This paper reports on an experimental investigation of the effect of both cycle-to-cycle variations and variations over a longer period on inter-ring pressure. The inter-ring pressure and piston ring movement were also simulated as a function of ring gap position. The experimental part of the project showed small cycle-to-cycle variations in the second land pressure as well as large variations over time. Simulations of the second land pressure with different ring gap positions showed a similar range of variation in second land pressure as the experimental variation.

Place, publisher, year, edition, pages
2010. Vol. 11, no 2, 153-161 p.
Keyword [en]
blow-by, diesel engine, inter-ring pressure, measurement, ring dynamics, second land pressure, simulation
URN: urn:nbn:se:kth:diva-25415DOI: 10.1243/14680874JER05509ISI: 000277638600006ScopusID: 2-s2.0-77950988844OAI: diva2:358052
PC 20201020 QC 20110104Available from: 2010-10-20 Created: 2010-10-20 Last updated: 2011-01-04Bibliographically approved
In thesis
1. Particulate Emissions Associated with Diesel Engine Oil Consumption
Open this publication in new window or tab >>Particulate Emissions Associated with Diesel Engine Oil Consumption
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Particulate emissions from diesel engines have been a key issue for diesel engine developers in recent decades. Their work has succeeded in reducing the exhaust particles from the combustion of fuel, which has led to increasing interest in the contribution of particulates from lubrication oil.

When discussing oil-related particulate emissions, hydrocarbon particles are customarily referred to. This thesis uses a broader definition, in which oil-related particulate emissions are modelled not only by the hydrocarbons, but also include the ash, carbons, and sulphate oil particulate emissions.

The model developed in the project uses input data as oil consumption and oil ash content combined with tuning parameters, such as the oil ash transfer rate (ash emissions divided by oil consumption and oil ash content). Controlled engine tests have been performed to verify assumptions and fill knowledge gaps. The model can be applied to a variety of diesel engines, although the tuning factors might have to be reset. For example, introducing diesel particulate filters would dramatically reduce the oil ash emissions, since oil ash would accumulate in the filter.

Oil consumption has played a central role in the present research. The modelling results indicate that special attention should be paid to oil consumption under running conditions with a low in-cylinder temperature, since the oil survival rate is high there.

Under low-load and motoring conditions, hydrocarbons proved to be the main contributor to oil-related particulate emissions. At high engine load, oil ash emissions were the largest contributor to oil-related particulate emissions.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 26 p.
Trita-MMK, ISSN 1400-1179 ; 2010:09
Lubrication oil, Particulate emission, Particulate matter (PM), Oil consumption, Diesel engine
urn:nbn:se:kth:diva-25880 (URN)978-91-7415-759-8 (ISBN)
Public defence
2010-11-26, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)
QC 20101103Available from: 2010-11-03 Created: 2010-11-03 Last updated: 2010-11-03Bibliographically approved

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