Cylinder Liner Deformation - An Investigation of its Decomposition Orders
                        under Varied Operational Load

Alshwawra, Ahmad; Pohlmann-Tasche, Florian; Stelljes, Frederik; Dinkelacker, Friedrich

doi:10.4271/2022-01-1040

Cited by 2 publications

(6 citation statements)

References 18 publications

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“…The grey cast iron liner shows a better geometrical performance compared to an aluminum alloy liner. However, the trends of the deformation and the influence of deformation orders are almost the same for both materials [12]. The thermal expansion coefficient dominates other material properties, including thermal conductivity, Young's modulus, and Poison's ratio, in terms of the deformation of the liner to improve the conformability between cylinder liner and piston.…”

Section: Introductionmentioning

confidence: 93%

“…The model focused on the first and half of the second cylinder to capture the different thermal loads generated by adjacent cylinders and their surroundings. It is expected that the deformation of the first and fourth cylinder liners would be more complicated and asymmetric than that of the second or third cylinder liner due to the asymmetric thermal load [12]. The first and half of the second cylinders are shown in Figure 1 as well as their positions in the engine.…”

Section: Simulation Modelmentioning

confidence: 99%

“…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%

“…Another method to control the liner deformation in the hot state is changing the liner material [12]. Materials or processes for the in-cylinder components of internal combustion engines have been investigated for better friction and performance [18,19].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 93%

Section: Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Performance of Additively Manufactured Cylinder Liner—A Numerical Study

et al. 2022

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“…Due to inhomogeneities resulting from the overall engine construction and uneven heat sources and sinks, deformations of the cylinder liner occur. The varying temperature distribution results, on the one hand, from heat flows from combustion combined with the cycle-dependent cooling performance of the coolant mass flow and, on the other hand, from mechanical loads arising from combustion pressure and assembly [2][3][4]. However, some of these effects can be partially compensated during the production of the cylinder liner using honing processes with a pretensioned liner.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Free-Form Honed Cylinder Liner for Heavy-Duty Engines

Stelljes,

Pohlmann-Tasche,

Dinkelacker

2024

Lubricants

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For future internal combustion engines, driven by regenerative fuels, efficiency is more important than ever. One approach to reduce the losses inside the piston cylinder unit (PCU) is to improve the alignment of the liner and the piston. Therefore, a cylinder liner with a free form was developed at the Institute of Technical Combustion (ITV) of the Leibniz University Hannover which compensates radial and linear deformations along the stroke. The layout is based on a FEM simulation. The liner was manufactured by the Institute of Production Engineering and Machine Tools (IFW) of Leibniz University of Hannover with a novel turn-milling process. The liner was investigated on the heavy-duty Floating-Liner engine of ITV with a displacement of 1991 ccm and a bore diameter of 130 mm. The experimental results show improvement in the friction losses over the whole engine map in the range of 9% and up to 17.3% compared to a serial liner. Sealing efficiency could be improved up to 28.8%, depending on the operational point. Overall, the investigation aims for lower fuel consumption which would in result fewer emissions.

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Cylinder Liner Deformation - An Investigation of its Decomposition Orders under Varied Operational Load

Cited by 2 publications

References 18 publications

Structural Performance of Additively Manufactured Cylinder Liner—A Numerical Study

Structural Performance of Additively Manufactured Cylinder Liner—A Numerical Study

Experimental Investigation of a Free-Form Honed Cylinder Liner for Heavy-Duty Engines

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