Review On Effects of Piston and Piston Ring Dynamics Emphasis with Oil Consumption and Frictional Losses in Internal Combustion Engines

Kurbet, S. N.; Malagi, Ravindra R.

doi:10.4271/2007-24-0059

Cited by 16 publications

(9 citation statements)

References 74 publications

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“…The HHT method uses the finite difference expression of Newmark 31 method, together with the variable numerical damping factor . The best choice of is in the interval À 1 3 , 0 Â Ã . The method is conditionaly stable and maintains the second-order accuracy.…”

Section: Dynamics Equation Numerical Solutionmentioning

confidence: 99%

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

Mahmoud

Knaus

Parikyan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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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 ringpack 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.

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Section: Dynamics Equation Numerical Solutionmentioning

confidence: 99%

“…It contributes about 20% of the total engine mechanical losses. 1 Therefore, the potential to improve the engine efficiency by reducing the friction in the piston ring pack is relatively large.…”

Section: Introductionmentioning

confidence: 99%

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

Mahmoud

Knaus

Parikyan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…However, the wear occurrence on the engine components leads to power loss, greatly increasing oil consumption and the CO 2 emissions to the environment. A reduction of friction between piston rings and the cylinder running surfaces is particularly effective to improve the matters, because roughly half of the mechanical friction losses in an internal combustion engine are generated in this tribological system [1][2][3]. One of the methods being developed to help meet the demands is thermal spray coatings technology for protecting the cylinder running surface.…”

Section: Introductionmentioning

confidence: 99%

Tribological behaviors of internal plasma sprayed TiO 2 -based ceramic coating on engine cylinder under lubricated conditions

He¹,

Guo²,

Wang³

et al. 2016

Tribology International

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“…3,4 The 1980s saw the incorporation of hydrodynamic lubrication (HL) into dynamic equations governing the piston secondary motions. 5…”

Section: Introductionmentioning

confidence: 99%

Detailed analysis of piston secondary motion and tribological performance

Delprete

Razavykia

Baldissera

2019

International Journal of Engine Research

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This article presents a detailed analytical model to evaluate piston skirt tribology under hydrodynamic lubrication. The contribution of the piston ring pack lubrication has been taken into account to study piston secondary motion and tribological performance. A system of nonlinear equations comprising Reynolds equation and force equilibrium is solved to calculate piston ring pack friction force and its moment about wrist pin axis. Instantaneous minimum oil film thickness at piston ring/liner interface has been estimated considering different boundary conditions: full Sommerfeld, oil separation, and Reynolds cavitation and reformation. The ring pack model has capability to be used for a wide range of ring face profiles under boundary and hydrodynamic lubrication. Piston secondary motion is evaluated using lubrication theory and equilibrium of forces and moments, to examine the effect of wrist pin location, piston skirt/liner clearance, and oil rheology. Numerical method and finite difference scheme have been used to define piston eccentricity and hydrodynamic pressure acting over the skirt.

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Review On Effects of Piston and Piston Ring Dynamics Emphasis with Oil Consumption and Frictional Losses in Internal Combustion Engines

Cited by 16 publications

References 74 publications

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

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

Tribological behaviors of internal plasma sprayed TiO 2 -based ceramic coating on engine cylinder under lubricated conditions

Detailed analysis of piston secondary motion and tribological performance

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