An assessment of gas power leakage and frictional losses from the top compression ring of internal combustion engines

Turnbull, Rob; Dolatabadi, Nader; Rahmani, Ramin; Rahnejat, Homer

doi:10.1016/j.triboint.2019.105991

Cited by 35 publications

(24 citation statements)

References 28 publications

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“…The combustion gases flow into and out of the piston-piston ring crevices during a typical engine cycle. Therefore, some engine power loss can be associated with the gas blow-by as is highlighted in Turnbull et al 39 To evaluate the leakage power loss a gas control volume model needs to be utilised to predict the mass flows through these crevices as shown schematically in Figure 2.…”

Section: Outline Of Methodologymentioning

confidence: 99%

“…Several methods for gas blow-by have already been presented in the literature. 16,39,59,60 The gas blow-by model used in the current study is that presented in Turnbull et al 39 Therefore, the details are repeated here for the sake of brevity. The associated power loss is obtained as 39,61 :…”

Section: Outline Of Methodologymentioning

confidence: 99%

“…32,33 These studies were later extended to include more realistic flexible elastodynamics of the compression ring in a series of studies for its in-plane (radial) and out-of-plane (axial and twist) motions. 33–37 Ring dynamics is essential in the study of both gas blow-by and frictional performance; an approach recently highlighted by Turnbull et al 38,39 Therefore, an integrated solution of gas dynamics through the crevices formed by an elastic ring and piston retaining grooves, together with a 2D tribological contact of ring-bore is required.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energy loss and emissions of engine compression rings with cylinder deactivation

Turnbull

Dolatabadi

Rahmani

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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A novel integrated multi-physics assessment of the piston top compression ring of an internal combustion engine under normal operation mode, as well as subjected to cylinder deactivation is carried out. The methodology comprises ring-liner thermo-mixed hydrodynamics, elastodynamics of ring, as well as combustion gas blow-by and emissions. Therefore, the analysis provides prediction of ring-liner contact’s energy losses and gas power leakage across the piston and ring crevices, as well as the resulting emissions. Cylinder deactivation (CDA) technology reduces the unburnt fuel entering the ring-pack crevices, as well as the emissions. It is also shown that the frictional and gas leakage power losses are exacerbated under CDA by as much as 20%. Although this is much lower than the potential gains in fuel usage when using CDA. The optimisation of the piston compression ring would provide further fuel efficiency and improved emissions, an issue which has not hitherto received the attention which it deserves. The in-depth analysis has also shown that CDA reduces the predicted CO, NOx and HC emissions by nearly as much as 8.5%, 10% and 8.7%, respectively.

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Section: Outline Of Methodologymentioning

confidence: 99%

Section: Outline Of Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy loss and emissions of engine compression rings with cylinder deactivation

Turnbull

Dolatabadi

Rahmani

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…The Reynolds equation 5is solved using the finite difference method and the application of the above approximations with boundary conditions. Relaxation method is used for finalizing the numerical solution using an initial guess for film thickness equation (6). The Newtonian lubricant is used in the numerical scheme for the lubrication solution.…”

Section: Simulation Algorithmmentioning

confidence: 99%

The compression ring profile influence on hydrodynamic performance of the lubricant in diesel engine

Menacer

Bouchetara

2020

Advances in Mechanical Engineering

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For different operating conditions of an internal combustion engine, the piston–ring–liner compartment represents one of the largest sources of friction and power losses. The aim of this article is to evaluate the effect of the compression ring profile on the main tribological performance of the lubricant in a four-stroke diesel engine. A one-dimensional analysis was developed for the hydrodynamic lubrication between the compression piston ring and the cylinder wall. A numerical method was applied to analyze the influence of different ring geometrical designs during the working cycle on oil film thickness, frictional force, and power losses. Our predicted results were validated with the Takiguchi data of a previous study, and they have shown a good agreement. The results in the current analysis demonstrated that the ring geometry profile, the engine speed, and load have a remarkable effect on oil film thickness, friction force, and friction power losses between the top ring and cylinder liner. Therefore, it would help in reducing friction as well as making a contribution to the improvement of engine performance such as torque, efficiency, and fuel consumption.

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“…ere are also some researches focusing on frictional losses [14], lubricating oil transport between piston and cylinder liner [15], experiment study of friction [16], and so on.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization Study of Piston in Diesel Engine Based on ABC-OED-FE Method

Qi¹,

Dong²,

Liu³

et al. 2021

Mathematical Problems in Engineering

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In order to increase the reliability and service life of piston in a heavy-duty diesel engine, the geometric structure of piston was optimized based on its maximum temperature and maximum coupling stress. To begin with, the boundary conditions of thermal and stress fields are calculated, which include the heat produced by the combustion in cylinder, the friction-induced heat, and the heat transferred to cooling system. Then, the finite element model was established to calculate and analyse the temperature and thermal-mechanical coupling stress fields of the piston. By combining this simulation model with orthogonal experimental design methods, computations and analyses were performed to determine how the five geometric parameters (depth of intake and exhaust valve grooves, radius of valve grooves transition, radius of top of valve grooves, height of first piston ring groove, and depth of piston ring groove) influence the two evaluation indicators (maximum temperature and maximum stress of piston). Subsequently, using the proposed ABC-OED- FE (artificial bee colony, orthogonal experiment design, and fitting equations) method, the fitting equations between the geometric parameters and evaluation indicators were determined. Taking the minimum values of two evaluation indicators of piston as optimization objectives, artificial bee colony method was run to determine the values of parameters. At last, the two evaluation indicators of the optimized piston were computed. The results indicate that, after optimization, the maximum temperature of piston decreases to be 16.05 K and the maximum stress decreases to be 13.54 MPa. Both temperature and stress conditions of the optimized piston had been improved, which demonstrates the effectiveness of the optimization and the validity of the algorithm.

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An assessment of gas power leakage and frictional losses from the top compression ring of internal combustion engines

Cited by 35 publications

References 28 publications

Energy loss and emissions of engine compression rings with cylinder deactivation

Energy loss and emissions of engine compression rings with cylinder deactivation

The compression ring profile influence on hydrodynamic performance of the lubricant in diesel engine

Analysis and Optimization Study of Piston in Diesel Engine Based on ABC-OED-FE Method

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