Modeling of Ring Twist For an IC Engine

Ejakov, Mikhail A.; Schock, Harold; Brombolich, Lawrence J.

doi:10.4271/982693

Cited by 28 publications

(28 citation statements)

References 4 publications

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“…As these deviations can be within the dimensions of the groove clearances, this influences the flow and pressure conditions in the ring-pack. The static ring twist on a piston ring is not constant over the circumference [32,41,47]. Its value is smallest at the ring end gap and reaches its max.…”

Section: Bar) -Effect Of Static Twist On the Axial And Radial Ring Stmentioning

confidence: 97%

“…In addition, a labyrinth-capillary gas flow model was developed that took into account the actual flow conditions of the real gap geometries. Another simulation model was developed by Brombolich [30] and expanded by Ejakov et al [31][32][33] over the years. The same numerical methods were implemented in the model to calculate the hydrodynamics, gas flow, contact force and boundary friction [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

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2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

Lyubarskyy

Bartel

2016

Tribology International

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Section: Bar) -Effect Of Static Twist On the Axial And Radial Ring Stmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

Lyubarskyy

Bartel

2016

Tribology International

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“…F urthermore, such a change in gas¯ow routes and¯owrates has a profound in¯uence on the oil¯ow on the piston and directly affects oil transport and oil consumption. Secondly, a ring may be pushed inwards by the gas pressure acting on the ring running surface and causes a direct gas leakage through the ring±liner interface [1,9,10]. This phenomenon is called ring radial colla pse and the emergence of the additional gas¯ow path during ring radial collapse also has a direct impact on blowby and oil transport.…”

Section: Introductionmentioning

confidence: 98%

Dynamic behaviours of piston rings and their practical impact. Part 1: Ring flutter and ring collapse and their effects on gas flow and oil transport

Tian

2002

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper describes the physics of two major dynamic behaviours of the piston rings, namely ring¯utter and ring collapse, and their effects on gas¯ow and oil transport. The analysis was conducted by applying a theoretical model in a spark ignition engine and a heavy-duty diesel engine. Parameters that have great in¯uence on these dynamic behaviours are discussed for these two different types of engine and different rings. Speci®cally, the importance of ring twist, torsional stiffn ess and ring±groove clearance to ring¯utter are discussed in detail. F or ring radial collapse, the paper presents a simple formula that determines value of the critical parameters to eliminate ring radial collapse. Emphases are placed on the importance of mechanical designs in changing the performance of the piston ring pack in blowby and oil consumption.

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“…For deformations that are small compared to the ring radius, the radial displacement of the neutral axis, y, can be expressed as [19]: (28) E and I are the ring Young's modulus and area moment of inertia. The ring is meshed with the curved beam element presented here and a straight beam element found in the literature [11]. Translation and rotation degree of freedoms of the base node are cancelled and the radial force F r is applied at the end node.…”

Section: Ring Structural Responsementioning

confidence: 99%

“…To address this issue, several numerical models of piston rings have been developed. Modeling the ring structure using straight beam finite elements has been a method of choice [11,12,13]. With this technique, ring deformation can be coupled to nonlinear contact with the ring surroundings (piston groove and cylinder liner).…”

Section: Introductionmentioning

confidence: 99%

A Dual Grid Curved Beam Finite Element Model of Piston Rings for Improved Contact Capabilities

Baelden

Tian

2014

SAE Int. J. Engines

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Piston rings are large contributors to friction losses in internal combustion engines. To achieve higher engine efficiency, low friction ring packs that can maintain good sealing performance must be designed. To support this effort, simulation tools have been developed to model the performance of piston rings during engine operation. However, the challenge of predicting oil consumption, blow by, and ring pack friction with sufficient accuracy remains. This is mostly due to the complexity of this system. Ring dynamics, deformation, interaction with liner and piston, gas and lubricant flow must all be studied together to make relevant predictions. In this paper, a new curved beam finite element model of piston rings is proposed. Ring structural deformation and contact with the liner are treated on two separate grids. A comparison with ring models in the literature and analytical solutions shows that it can provide accurate results efficiently. The proposed model can serve as a numerical framework to couple ring structural deformation, interaction with liner and piston, and predict oil transport. The new model is used to study conformability of piston rings to distorted bore. Results show that the differences between existing conformability criteria can be explained by the singular behavior of the ring gap region.

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Modeling of Ring Twist For an IC Engine

Cited by 28 publications

References 4 publications

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

2D CFD-model of the piston assembly in a diesel engine for the analysis of piston ring dynamics, mass transport and friction

Dynamic behaviours of piston rings and their practical impact. Part 1: Ring flutter and ring collapse and their effects on gas flow and oil transport

A Dual Grid Curved Beam Finite Element Model of Piston Rings for Improved Contact Capabilities

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