Analysis of Oil Film Thickness on a Piston Ring of Diesel Engine: Effect of Oil Film Temperature

Abstract

This paper describes an analysis of oil film thickness on a piston ring of a diesel engine. The analysis of the oil film thickness has been performed by using Reynolds equation and unsteady, two-dimensional energy equation with heat generated from viscous dissipation. The mean oil film temperature was determined from the calculation of the temperature distribution in the oil field which was calculated using the energy equation. The oil film viscosity was then estimated using the mean oil film temperature. The effect of oil film temperature on the oil film thickness of a piston ring was examined. This model has been verified with published experimental results. Moreover, the heat flow at ring and liner surfaces was examined. Results show that the oil film thickness could be calculated using the viscosity estimated from the mean oil film temperature. The calculated values generally agree with the measured values. For higher engine speed conditions, the maximum values of the calculated oil film thickness are larger than the measured values.

Engine piston rings improvement through effective materials, advanced manufacturing methods and novel design shape

“…Under the assumption of incompressible oil film with Newtonian behaviour, uniform viscosity along the whole ring surface, laminar flow, uniform properties as specific heat, heat conductivity, in a engine cycle while the oil viscosity is a function of temperature, fully flooded inlet and Reynolds boundary conditions (the oil starvation is not considered), the one-dimensional unsteady Reynolds equation can be coupled with the energy equation (Harigaya et al, 2003). A result of this work is depicted in Figure 2.…”

“…Oil film temperature analysis The analysis of the oil film thickness can be performed by using Reynolds equation coupled with the two-dimensional energy equation, in order to take into account the oil temperature increasing due to the heat generated from the viscous dissipation (Harigaya et al, 2003).…”

Relación Existente entre la Temperatura del Aceite del Motor, Régimen de Giro y Aceleraciones Efectivas RMS, al Utilizar Gasolina y una Mezcla entre Gasolina-Etanol

“…Estudios han demostrado que, de manera general, al tener un aumento en la temperatura del lubricante, su viscosidad tiende a disminuir, ocasionando menor fricción entre componentes móviles pertenecientes a la máquina térmica (Harigaya, Suzuki, & Takiguchi, 2003;Severa, Havlíček, & Kumbár, 2014) . La fricción interna del motor puede llegar a representar el 50% del total de las pérdidas mecánicas (Macián, Tormos, Ruiz, & Miró, 2016).…”

“…A mayor viscosidad, el espesor aumentará. En los ciclos de admisión y escape se tendrá mayores espesores en comparación a los ciclos de compresión y expansión (variación de temperatura) (Harigaya et al, 2003). El incremento de la presión de lubricación provocará que la viscosidad sea mayor (Bair, 2000;Bair, Jarzynski, & Winer, 2001), aumentando de igual manera el espesor.…”

Effect of Non-Newtonian Effect of Lubricant on the Lubrication Performance of Piston Ring-Cylinder Liner Components for Diesel Enginee

“…In recent years, many results have been achieved. For example, Harigaya [1], Hamatake [2], Froelund, K [3], Ejakov [4], Hamatake, Toshiro [5], Toshiro and Y [6] Harigaya have studied the effects of lubricant viscosity on the film thickness and friction force of piston ring-cylinder liner components. TIAN [7][8] and the research impact of the dynamics of piston and piston ring set on the effect of friction and lubrication.…”