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, Tian

doi:10.1243/135065002760199961

Cited by 90 publications

(74 citation statements)

References 13 publications

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“…For example, Tian [7,24] comprehensively studied piston ring design parameters such as ring width, materials, ring twist, torsional stiffness, and ring-groove clearance to analyze the dynamic behavior of piston rings and their impact on gas flow and oil transport. Kapsiz et al [25] used the Taguchi design method to optimize the friction and wear between the piston ring and cylinder liner pair.…”

Section: Design Parameter Optimizationmentioning

confidence: 99%

Design approach for optimization of a piston ring profile considering mixed lubrication

Zhang

Xie

2016

Friction

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Abstract:To reduce the friction of a piston ring while maintaining a large oil film load-carrying capacity, an approach comprising of the inverse method and the sequential quadratic programming algorithm was proposed. The approach considers the variation of mixed lubrication and variable lubricant viscosity with temperature along the engine stroke, is developed to optimize the profile of a piston ring. A piston ring profile is represented by a polynomial function. A case study of the second piston ring shows that the proposed method can be applied for the optimization of a piston ring profile. In addition, this paper illustrates the effects of the degree of a polynomial function. The results show that the minimization of friction and maximization of oil film load-carrying capacity can be balanced simultaneously when the degree of the polynomial is 2 and 5.

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Section: Design Parameter Optimizationmentioning

confidence: 99%

Design approach for optimization of a piston ring profile considering mixed lubrication

Zhang

Xie

2016

Friction

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“…A dynamic piston-ring pack model has been developed at the Sloan Automotive Lab to study friction, oil consumption, wear, and blowby [46][47][48][49]. In quantifying these areas this model specifically examines ring-liner lubrication, gas flows, ring dynamics, and the influence of piston and ring design parameters.…”

Section: Piston-ring Pack Modelmentioning

confidence: 99%

Crevice Volume Effect on Spark Ignition Engine Efficiency

Smith¹,

Cheng²,

Heywood³

2014

SAE Technical Paper Series

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A set of experiments and a simulation study are completed to quantify the effect of the piston crevice on engine efficiency. The simulation study breaks down the loss mechanisms on brake efficiency at different displacement volumes (300 -500 cc) and compression ratios (8-20). Experiments focus on indicated efficiencies for a narrow range of compression ratios (9.24-12.57) with different piston crevice volumes. Piston crevice volume is increased in two steps by machining a groove into the piston top land, and is decreased by raising the top ring. Indicated efficiency is measured at various loads (0.4 -1.0 bar MAP), speeds (1500, 2000, 2500 rpm), and coolant temperatures (50'C and 80'C). All data points compared in this study are recorded at MBT timing with a relative air-fuel ratio (k) of 1.For the baseline case (CR = 9.24, speed = 2000 rpm, coolant = 80'C), increased crevice volume results in an indicated efficiency degradation of 0.3-0.5%-points per 1000 mm 3 . This absolute decrease corresponds to a 1.2-1.5% relative decrease for a 100% increase in crevice volume; referenced to the control piston crevice modification. Decreasing crevice volume leads to a gain in indicated efficiency of 2.3-3.5%-points per 1000 mm 3 , which corresponds to a 6.9-11.8% relative increase for a 100% decrease in crevice volume; referenced to the control piston crevice modification.Results of the experimental investigation, when compared across compression ratio, engine speed, and coolant temperature, show that the crevice effect on efficiency is largely independent of these three parameters. Large gains from decreased piston crevice volume prompt renewed discussions on piston top land, top ring, and crown design.

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“…Additionally, depending on operating condition unstable behaviour of the piston rings may occur [27] like ring flutter (rapid oscillating movement of the piston ring in its groove) or ring collapse (inward forces on the ring exceed the ring tension), which needs to be avoided in practical designs. To summarize, the piston assembly has to fulfil many functions.…”

Section: Sources Of Friction In Icesmentioning

confidence: 99%