Cylinder liner deformation orders and efficiency of a piston ring-pack

Selmani, Erjon; Delprete, Cristiana; Bisha, Arian

doi:10.1051/e3sconf/20199504001

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…The work given by Selmani et al (2019) describes in detail the influence of liner roundness deviations on the tightness of piston-cylinder liner.…”

Section: Causes and Consequences Of Leaks Diagnosis Of Combustion Chamber Tightnessmentioning

confidence: 99%

Identification of the piston machine combustion chamber tightness

Bielawski

2020

JQME

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PurposeThe lack of integrity of the piston machine combustion chamber manifests itself in leakages of the working fluid between the piston and the cylinder liner, at valves mounted in the cylinder head and between the head and the liner. An untight combustion chamber leads to decreased power output or efficiency of the engine, while leaks of a fluid may cause damage to many components of the chamber. The actual value of working chamber leak is a desired and essential piece of information for planning operations of a given machine.Design/methodology/approachThis research paper describes causes and mechanisms of leakage from the working chamber of internal combustion engines. Besides, the paper outlines presently used methods and means of leak identification and states that their further development and improvements are needed. New methods and their applicability are presented.FindingsThe methods of leak identification have been divided into diagnostic and non-working machine leak identification methods. The need has been justified for the identification of leakage from the combustion chamber of a non-working machine and for using the leakage measure as the value of the cross-sectional area of the equivalent leak, defined as the sum of cross-section areas of all leaking paths. The analysis of possible developments of tightness assessment methods referring to the combustion chamber of a non-working machine consisted in modelling subsequent combustion chamber leaks as gas-filled tank leak, leak from another element of gas-filled tank and as a regulator of gas flow through a nozzle.Originality/valueA measurement system was built allowing the measurement of pressure drop in a tank with the connected engine combustion chamber, which indicated the usefulness of the system for leakage measurement in units as defined in applicable standards. A pneumatic sensor was built for measuring the cross-sectional area of the equivalent leak of the combustion chamber connected to the sensor where the chamber functioned as a regulator of gas flow through the sensor nozzle. It has been shown that the sensor can be calibrated by means of reference leaks implemented as nozzles of specific diameters and lengths. The schematic diagram of a system for measuring the combustion chamber leakage and a diagram of a sensor for measuring the cross-sectional area of the equivalent leak of the combustion chamber leakage are presented. The results are given of tightness tests of a small one-cylinder combustion engine conducted by means of the set up measurement system and a pre-prototype pneumatic sensor. The two solutions proved to be practically useful.

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“…The work given by Selmani et al (2019) describes in detail the influence of liner roundness deviations on the tightness of piston-cylinder liner.…”

Section: Causes and Consequences Of Leaks Diagnosis Of Combustion Chamber Tightnessmentioning

confidence: 99%

Identification of the piston machine combustion chamber tightness

Bielawski

2020

JQME

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“…To ensure the proper application of materials, including composite materials, it is essential for understanding the force distribution on the construction element. During operation, a combustion engine piston is under a complex system of stresses, which has been widely discussed, analyzed, and described by many authors [ 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that the main function of piston rings is to seal the combustion chamber against the crankcase. In turn, inter-ring dynamics are highly affected by inter-ring fluid dynamics, and many authors have considered both phenomena together, similar to Selmani et al [ 34 ]. The forces acting on the piston rings were discussed by Niewczas et al [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Tribological Properties of Aluminum Matrix Composites Intended for Cooperation with Piston Rings in Combustion Engines

et al. 2022

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Tribological interactions between the piston groove and ring in combustion engines have a significant influence on mechanical friction losses. Based on the analysis of the distribution of forces acting on the piston, the conditions for the friction tests were selected. The research was carried out on composites reinforced with silicon carbide (SiCp), glassy carbon (GCp), and a hybrid mixture of particles (SiCp + GCp). Tribological tests were carried out under extremely unfavorable dry sliding conditions using a pin-on-block tester. The friction of coefficient and wear values of the matrix alloy, composites, and iron were compared. Profilometry was used to perform quantitative and qualitative analyses of the wear tracks formed on the tested surfaces. The effect of the presence of reinforcing particles on the geometry of working surfaces was also evaluated. The obtained results show that AlSi12CuNiMg/SiCp and AlSi12CuNiMg/SiCp + GCp composites provided satisfactory effects towards stabilizing the friction coefficient and reducing the wear of tested tribological couples. This may provide a new solution dedicated to an important system, which is the piston groove/piston ring in diesel engines.

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“…This additional tightness decreases the engine efficiency due to the increase in frictional losses and increases the emission as more fuel will be consumed [7,9]. Enhancing the geometrical performance of the cylinder liner to increase its roundness in the hot state represents a good solution for this dilemma [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Structural Performance of Additively Manufactured Cylinder Liner—A Numerical Study

et al. 2022

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Climate change is exacerbated by vehicle emissions. Furthermore, vehicle pollution contributes to respiratory and cardiopulmonary diseases, as well as lung cancer. This requires a drastic reduction in global greenhouse gas emissions for the automobile industry. To address this issue, researchers are required to reduce friction, which is one of the most important aspects of improving the efficiency of internal combustion engines. One of the most important parts of an engine that contributes to friction is the piston ring cylinder liner (PRCL) coupling. Controlling the linear deformation enhances the performance of the engine and, as a result, contributes positively to its performance. The majority of the tests to study the conformability between cylinder liner and piston were carried out on cylinder liners made of cast iron. It is possible to improve the performance of piston ring cylinder liner couplings by implementing new and advanced manufacturing techniques. In this work, a validated finite element model was used to simulate the performance when advanced manufactured materials were adapted. The deformation of the cylinder liner due to thermal and mechanical loads is simulated with five different additive manufactured materials (Inconel 625, Inconel 718, 17-4PH stainless steel, AlSi10Mg, Ti6Al4V). Simulated roundness and straightness errors, as well as maximum deformation, are compared with conventional grey cast iron liner deformation. Some additive manufactured materials, especially Ti6Al4V, show a significant reduction in deformation compared to grey cast iron, both in bore and circumferential deformation. Results show that Ti6Al4V can reduce maximum liner deformation by 36%. In addition, the roundness improved by 36%. The straightness error when Ti6Al4V was used also improved by 44% on one side, with an average of 20% over the four sides. Numerical results indicate that additive manufactured materials have the potential to reduce friction within the piston liner arrangement of internal combustion engines.

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Cylinder liner deformation orders and efficiency of a piston ring-pack

Cited by 6 publications

References 15 publications

Identification of the piston machine combustion chamber tightness

Identification of the piston machine combustion chamber tightness

Assessment of the Tribological Properties of Aluminum Matrix Composites Intended for Cooperation with Piston Rings in Combustion Engines

Structural Performance of Additively Manufactured Cylinder Liner—A Numerical Study

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