Thermohydrodynamic Lubrication Characteristics of Piston Rings in Diesel Engine Considering Transient Heat Transfer under the Parameterized Surface Texture of Cylinder Liners

Hongyang Zhang, Xiaori Liu (), Junzhen Gong, Shuzhan Bai (), Ke Sun () and Haoran Jia
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Hongyang Zhang: School of Energy and Power Engineering, Shandong University, Jinan 250100, China
Xiaori Liu: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300130, China
Junzhen Gong: State Key Laboratory of Engine and Powertrain System, Weifang 261061, China
Shuzhan Bai: School of Energy and Power Engineering, Shandong University, Jinan 250100, China
Ke Sun: School of Energy and Power Engineering, Shandong University, Jinan 250100, China
Haoran Jia: School of Energy and Power Engineering, Shandong University, Jinan 250100, China

Energies, 2023, vol. 16, issue 24, 1-17

Abstract: The cylinder liner and piston ring form the most crucial friction pair in the diesel engine, contributing 35–40% of its overall friction losses. Recent research indicates that transient heat transfer significantly affects piston ring lubrication. However, the impact of such a transfer on varying surface textures and lubrication traits remains unclear. This paper takes the piston ring–cylinder liner of a certain diesel engine as the research object, which is based on a two-dimensional averaged Reynolds function and Greenwood–Tripp micro convex body contact model; establishes a numerical calculation model of the transient heat fluid lubrication characteristics of a vertical piston ring–cylinder liner assembly by combining the oil film thickness equation, energy equation, lubricating oil viscosity–temperature, and viscosity pressure characteristics; avoids large errors associated with assuming different temperature values for lubricants; and also uses the cylinder liner surface texturing technique to examine the effects of surface texturing on lubrication properties in the presence of transient thermal fluids. The findings indicate that employing transient thermal fluid for determining the mean value of the oil film temperature in isothermal lubrication calculations yields comparable values for minimum oil film thickness and frictional power consumption, while the friction power consumption calculated by the transient thermal fluid is slightly lower. The depth of the recesses on the surface of the cylinder liner should be minimized, while the radius of the texture should be maximized, taking into consideration the current circumstances. Compared with a cylindrical texture, a spherical texture achieves lower friction with good lubrication indexes.

Keywords: diesel engine; piston ring lubrication; transient heat transfer; surface texture; thermohydrodynamic lubrication characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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