Modeling of the Rotary Engine Apex Seal Lubrication

2015-01-2035

09/01/2015

Event
JSAE/SAE 2015 International Powertrains, Fuels & Lubricants Meeting
Authors Abstract
Content
The Wankel rotary engine is more compact than conventional piston engines, but its oil and fuel consumption must be reduced to satisfy emission standards and customer expectations. A key step toward this goal is to develop a better understanding of the apex seal lubrication to reduce oil injection while reducing friction and maintaining adequate wear. This paper presents an apex seal dynamics model capable of estimating relative wear and predicting friction, by modeling the gas and oil flows at the seal interfaces with the rotor housing and groove flanks. Model predictions show that a thin oil film can reduce wear and friction, but to a limited extent as the apex seal running face profile is sharp due to the engine kinematics. The seal-housing interface remains between the boundary and mixed lubrication regimes, which leads to large asperity contact pressure and therefore significant wear of the running face, and an effective friction coefficient that varies between 0.03 to 0.11 depending on speed and load.
Meta TagsDetails
DOI
https://doi.org/10.4271/2015-01-2035
Pages
11
Citation
Picard, M., Tian, T., and Nishino, T., "Modeling of the Rotary Engine Apex Seal Lubrication," SAE Technical Paper 2015-01-2035, 2015, https://doi.org/10.4271/2015-01-2035.
Additional Details
Publisher
Published
Sep 1, 2015
Product Code
2015-01-2035
Content Type
Technical Paper
Language
English