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Computational Study on the Frictional Power Loss Reduction of Piston Ring with Laser Surface Texturing on the Cylinder Liner

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Abstract

—Hydrodynamic lubrication is simulated under the contact conditions that the direction of contact velocity reverses with a sudden high applied load in the contact of piston top ring and cylinder liner. Hydrodynamic lubrication film formation and pressure between piston ring and cylinder liner at the top dead center (TDC) location are investigated in detail because most friction loss and wear damage happen at this location due to the thin-film thickness resulting from the slow-down and reversal contact velocities as well as high applied load. The surface roughness on the cylinder liner by the honing process that is similar scale to the lubrication film thickness at TDC location is considered. Around the TDC location, laser surface textured (LST) surface that is larger scale than the surface roughness is designed for the favorable film formation. These two surface roughness parameters are simulated to study the effects of favorable film formation and less frictional loss of piston top ring at TDC location where most of damage and friction loss occur. Frictional power loss and minimum film thickness of the cylinder surfaces of the honed roughness are compared with those of patterned designs.

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Abbreviations

A a :

asperity contact area, m2

c :

piston ring profile height, m

d :

depth of LST pattern, m

F fasp :

friction of asperity contact, N

F fhyd :

shear resistance of the hydrodynamic lubrication film, N

F ring tension :

piston ring tension, N

F 2(χ) :

statistical function of the lubricant film ratio

h(x, y, t):

lubrication film thickness, m

h 0(x, y, t):

minimum film thickness, m

h c(x, y, t):

lubrication film thickness by the piston ring profile, m

h d(x, y, t):

lubrication film thickness by the LST geometry, m

h s(x, y, t):

lubrication film thickness by surface roughness, m

L :

length of the LST pattern, m

L p :

pitch of the LST pattern, m

I pr :

width of the piston ring, m

p hyd :

hydrodynamic pressure, Pa

p asp :

asperity contact pressure, Pa

P c :

vapor pressure of the lubricant, Pa

P comb :

combustion pressure, Pa

R a :

surface roughness, m

R c :

radius of the crank shaft rotation, m

U :

sliding velocity, ms−1

W :

width of the LST pattern, m

W a :

asperity contact load, N

x c :

coordinate in the ring profile, m

x d :

coordinate in the LST pattern, m

x p(θ):

piston’s displacement, m

ẋ p(θ):

piston’s velocity, ms−1

z :

asperity height, m

μ :

lubricant viscosity, Pa·s

ρ :

lubricant density, kg·m−3

θ :

volume fraction of the fluid

β :

radius of curvature of an asperity, m

η :

asperity density per unit surface area, m−2

ρ :

average asperity height, m

τ 0 :

limiting Eyring shear stress, Pa

Ϛ :

pressure-induced shear strength of asperities

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Acknowledgement

This work was supported by the Basic Science Program through the National Research Foundation (NRF), Grant No.: 2018R1D1A1B07043950 & BK21(5199990814084).

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  1. School of Automotive Engineering, Kookmin University, Seoul, 02707, Korea

    Siyoul Jang

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  1. Siyoul Jang
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Correspondence to Siyoul Jang.

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Jang, S. Computational Study on the Frictional Power Loss Reduction of Piston Ring with Laser Surface Texturing on the Cylinder Liner. Int.J Automot. Technol. 23, 855–865 (2022). https://doi.org/10.1007/s12239-022-0076-0

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  • DOI: https://doi.org/10.1007/s12239-022-0076-0

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