A One-Line Correlation for Predicting Oil Vaporization from Liner for IC Engines

2018-01-0162

04/03/2018

Features
Event
WCX World Congress Experience
Authors Abstract
Content
The increasingly stringent regulations for fuel economy and emissions require better optimization and control of oil consumption. One of the primary mechanisms of oil consumption is vaporization from the liner; we consider this as the “minimum oil consumption (MOC).” This paper presents a physical-mathematical cycle model for predicting the MOC. The numerical simulations suggest that the MOC is markedly sensitive to oil volatility, liner temperature, engine load and speed but less sensitive to oil film thickness. A one-line correlation is proposed for quick MOC estimations. It is shown to have <15% error compared to the cycle MOC computation.
In the “dry region” (between top ring and OCR at the TDC), oil is depleted due to high heat and continual exposure to the combustion chamber. MTU Friedrichshafen GmbH, who develops and produces large high-speed engines and propulsion systems, conducted experiments on an single-cylinder diesel engine, which is only used for test purposes and measured the oil content in the exhaust gas via radioactive markers. This measured oil consumption was a result of both oil transport and oil vaporization. However, the MOC prediction including the dry region without treatment to oil film thickness and properties unreasonably exceeded the measured oil consumption. Therefore, excluding the dry region is believed to be a better gauge for lower bound estimations of the MOC.
Meta TagsDetails
DOI
https://doi.org/10.4271/2018-01-0162
Pages
15
Citation
Zhang, Q., Tian, T., and Koeser, P., "A One-Line Correlation for Predicting Oil Vaporization from Liner for IC Engines," SAE Technical Paper 2018-01-0162, 2018, https://doi.org/10.4271/2018-01-0162.
Additional Details
Publisher
Published
Apr 3, 2018
Product Code
2018-01-0162
Content Type
Technical Paper
Language
English