scholarly journals Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack of Internal Combustion Engines

2004 ◽  
Author(s):  
Yeunwoo Cho ◽  
Tian Tian
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Internal Combustion ◽  
Engine Oil ◽  
Combustion Engines ◽  
Piston Ring Pack ◽  
Ring Pack

Computer Simulation of the Behavior of the Piston Ring Pack of Internal Combustion Engines

2016 ◽  
Vol 821 ◽  
pp. 166-171
Author(s):  
Peter Raffai ◽  
Pavel Novotný ◽  
Jozef Dlugoš
Keyword(s):  
Computer Simulation ◽  
Research And Development ◽  
Internal Combustion Engines ◽  
Piston Ring ◽  
Internal Combustion ◽  
Optimization Process ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Piston Ring Pack ◽  
Ring Pack

The continuously tightening regulations limiting the amount of exhaust gas components of internal combustion engines force the manufacturers to further increase the effectivity of their power units. Due to the already relatively highly-developed state of engines result in the need of research and development of even smaller engine parts – e.g. piston rings. The main aim of this project was to develop a tool for the computer simulation of the behavior of the piston ring pack, which could aid the optimization process of the piston ring pack towards lowered friction losses.

An Integrated Model of Ring Pack Performance

1991 ◽  
Vol 113 (3) ◽  
pp. 382-389 ◽  
Author(s):  
R. Keribar ◽  
Z. Dursunkaya ◽  
M. F. Flemming
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Engine Speed ◽  
Integrated Model ◽  
Design Parameters ◽  
Combustion Engines ◽  
Predictive Tool ◽  
Engine Friction ◽  
Piston Ring Pack ◽  
Ring Pack

This paper describes an integrated model developed for the detailed characterization and simulation of piston ring pack behavior in internal combustion engines and the prediction of ring pack performance. The model includes comprehensive and coupled treatments of (1) ring-liner hydrodynamic and boundary lubrication and friction; (2) ring axial, radial, and (toroidal) twist dynamics; (3) inter-ring gas dynamics and blowby. The physics of each of these highly inter-related phenomena are represented by submodels, which are intimately coupled to form a design-oriented predictive tool aimed at the calculation of ring film thicknesses, ring motions, land pressures, engine friction, and blowby. The paper also describes the results of a series of analytical studies investigating effects of engine speed and load and ring pack design parameters, on ring motions, film thicknesses, and inter-ring pressures, as well as ring friction and blowby.

An integrated model for the performance of piston ring pack in internal combustion engines

2017 ◽  
Vol 232 (3) ◽  
pp. 371-384 ◽  
Author(s):  
Kamel G Mahmoud ◽  
Oliver Knaus ◽  
Tigran Parikyan ◽  
Guenter Offner ◽  
Stjepan Sklepic
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Three Dimensional ◽  
Combustion Engines ◽  
Two Dimensional ◽  
Modelling Method ◽  
Ring Dynamics ◽  
Piston Ring Pack ◽  
Ring Pack ◽  
Modelling Approach

Piston rings are important components in internal combustion engines. Their primary function is to seal dynamically the gap between moving piston and cylinder liner surface in order to prevent the combustion gases from penetrating into the crankcase. The rings also control the oil leakage from the crankcase to the combustion chamber. The performance of the piston ring pack impacts the engine efficiency, durability and emissions. The recognition of the impact of the ring-pack performance on the engine design resulted in a sustained effort of research and development aimed at understanding the operation of the piston ring pack. Most of the published models developed in this field are two-dimensional assuming that the ring and liner are perfect circles for the purpose of modelling the axial and radial dynamics. Although this approach has proved to be useful, there exist a number of asymmetrical characteristics of the power cylinder system that can be crucial to the ring-pack performance and therefore it is considered to be appropriate. In this work, an integrated methodology that handles the complex ring-pack mechanism is presented. The physics of the ring-pack mechanism covers the three-dimensional piston ring dynamics of asymmetric engine cylinder due to bore distortion, the mixed lubrication at ring running face as well as the ring flanks and the interring gas dynamics. The modelling method is verified in two steps. In the first step, the dynamic behaviour of the three-dimensional ring model is verified against a commercial finite element software by comparing the eigenmodes up to a frequency of about 1 kHz. In the second step, the ring-pack modelling approach using three-dimensional ring models is also verified against a commercial ring dynamics program, which is based on the two-dimensional modelling. It is shown that the three-dimensional ring dynamics modelling method has advantages over the two-dimensional modelling approach as it facilitates studying the influence of the non-uniform twist along its circumference (ring winding), the effect of bore distortion on blow-by, ring friction, friction power losses and wear.

Tribotest of engine piston ring/cylinder liner pairs with different nanoparticles added into engine oil

2018 ◽  
Vol 72 (2) ◽  
pp. 217-231
Author(s):  
Selman Demirtas ◽  
Hakan Kaleli ◽  
Mahdi Khadem ◽  
Dae-eun Kim
Keyword(s):  
Carbon Nanotubes ◽  
Internal Combustion Engines ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Economic Life ◽  
Engine Oil ◽  
Combustion Engines ◽  
Content Type ◽  
Walled Carbon Nanotubes

Purpose Wear on internal combustion engines is a loss of material that occurs with the rubbing of the materials in contact with each other and significantly reduces the economic life of the engine. Even the smallest precaution that can be taken to prevent friction and wear in the engines can provide economical savings in very large quantities. Internal combustion engines are widely utilized in modem automobiles. Around 10 per cent of the total fuel energy is dissipated to heat due to mechanical friction, among which 20 per cent is caused by the contact between the cylinder liner and the piston rings. Design/methodology/approach In this study, real piston ring-cylinder specimens were tested with reciprocating tribometer by using five different nanoparticles added to engine oil to investigate their wear and friction behavior. Findings With regard to the experiments, it has been found that the best results were determined by TiO2 and single-walled carbon nanotubes according to boron nitride, multi-walled carbon nanotubes and graphene nanoparticles added to the engine oil, respectively. At the end of the tests, different wear mechanisms have been determined after the surface analyses on the piston ring and cylinder liner surface, and abrasive wear has been observed as the main wear mechanism. Originality/value This paper has an originality with regard to adding different nanoparticles into the commercial engine oil.

scholarly journals Interring Gas Dynamic Analysis of Piston in a Diesel Engine considering the Thermal Effect

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Wanyou Li ◽  
Yibin Guo ◽  
Tao He ◽  
Xiqun Lu ◽  
Dequan Zou
Keyword(s):  
Gas Dynamics ◽  
Thermal Deformation ◽  
Internal Combustion Engines ◽  
Piston Ring ◽  
Combustion Engines ◽  
Inverse Heat Conduction ◽  
Piston Head ◽  
Ring Dynamics ◽  
Piston Ring Pack ◽  
Ring Pack

Understanding the interaction between ring dynamics and gas transport in ring pack systems is crucial and needs to be imperatively studied. The present work features detailed interring gas dynamics of piston ring pack behavior in internal combustion engines. The model is developed for a ring pack with four rings. The dynamics of ring pack are simulated. Due to the fact that small changes in geometry of the grooves and lands would have a significant impact on the interring gas dynamics, the thermal deformation of piston has been considered during the ring pack motion analysis in this study. In order to get the temperature distribution of piston head more quickly and accurately, an efficient method utilizing the concept of inverse heat conduction is presented. Moreover, a sensitive analysis based on the analysis of partial regression coefficients is presented to investigate the effect of groove parameters on blowby.

The effects of DLC-coated journal on improving seizure limit and reducing friction under engine oil lubrication

2021 ◽  
pp. 146808742110129
Author(s):  
Hidemi Ogihara ◽  
Takumi Iwata ◽  
Yuji Mihara ◽  
Makoto Kano
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Internal Combustion ◽  
Engine Oil ◽  
Combustion Engines ◽  
Main Bearing ◽  
Dlc Coating ◽  
Lubrication Regime ◽  
Mixed Lubrication Regime ◽  
Reduce Emissions

Internal combustion engines have been improved markedly in recent years through efforts to conserve resources, reduce emissions and improve fuel efficiency. In this regard, the authors have been working to reduce friction and improve the seizure properties of the crankshaft main journal and main bearing. These mechanical components of internal combustion engines incur large friction losses. In order to reduce friction, journals have been coated with a diamond-like carbon (DLC) coating, which has been reported to reduce friction in the fluid lubrication regime in recent years. Another current issue of journals and bearings is the need to improve seizure resistance. Therefore, these properties were evaluated for material combinations of aluminium alloy bearings and DLC-coated journals, which have low affinity. The results revealed that friction was reduced under a fluid lubrication regime and seizure resistance was improved under a mixed lubrication regime.

Overview of engine oil replacement technologies in internal combustion engines of agricultural machinery

2020 ◽  
pp. 10-16
Author(s):  
S.A. Belov ◽  
I.V. Busin
Keyword(s):  
Economic Efficiency ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
The State ◽  
Engine Oil ◽  
Combustion Engines ◽  
Lubrication System ◽  
Agricultural Machinery ◽  
High Quality

The article reviews four existing technologies for replacing engine oil and a method for determining its suitability for improving economic efficiency. It is established that the oil is replaced according to the need in accordance with the defect indicators. This technology of oil condition is characterized by a more complete use of its resource. The frequency of replacement is determined by the indicators of condition, which is monitored by special sensors built into the engine lubrication system. However, the difficulty of using this technology is due to the lack of high-quality devices for monitoring the state of running engine oil in the engine.

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