Parametric Analysis of the Effect of Engine Speed and Load on the Hydrodynamic Performance of the Lubricant in Diesel Engine

Abstract

The oil consumption in an internal combustion engine is an important source of pollution and particulate emissions, main efforts are done by the manufacturers to reduce to the maximum the impact of the oil consumption on the emissions of the engine, and to satisfy the increasingly rigorous standards of pollution. The losses by friction due to piston ring friction explain 20 % of the total mechanical losses in internal combustion engines. A reduction in piston ring friction would therefore result in higher efficiency, lower fuel consumption and reduced emissions. The goal of this study is to develop a numerical method by using of GT-Suite software to analyze the influence of engine speed and engine load during the working cycle on oil film thickness, frictional force, power losses. Our predicted results were validated with the experimental data of a previous study, and they have shown a good agreement. The results in the current analysis demonstrated that the engine speed and load have a remarkable effect on oil film thickness, friction force and friction power losses between the top ring and cylinder liner. So, it would help in reducing friction as well as making a contribution towards the improvement of engine performance such as torque, efficiency and fuel consumption.

Investigation of friction properties in the piston-cylinder liner region of a single-cylinder compressed air engine using the GT-SUITE program

“…31 Together with the decrease in sliding speed in parts closer to TDC and BDC, asperity friction force increases. 32…”

“…31 Together with the decrease in sliding speed in parts closer to TDC and BDC, asperity friction force increases. 32 Figure 5 shows friction power change based on CA for four different engine speeds (middle ring). According to the results of the analysis, asperity friction force is more effective on ring power loss.…”

Numerical Analysis to Investigate the Impact of Skirt Geometric Parameters on Secondary Piston Movement in a Single-cylinder Diesel Engine

“…This motion can have significant consequences on the engine's performance, vibration and lubrication. Indeed, this secondary motion can increase the friction and wear of components such as cylinder walls, piston rings, and bearings [3]. There are numerous research studies in literature that are dedicated to examining the secondary motion of pistons, specifically concerning the effectiveness, emissions, and longevity of engines, such as [4,5].…”

“…Due to the non-linear behavior of forces and moments acting on the piston, the pressure distribution in the lubrication film is not uniform. As a result, the Reynolds hydrodynamic lubrication model, as referenced in [3], is frequently utilized to describe the system dynamics. The model is formulated as follows in Eq.…”