Devising a model of the airflow with dust particles in the intake system of a vehicle’s internal combustion engine

Abstract

This paper considers the mechanism of malfunction of internal combustion engines that implies the accelerated local wear of parts in individual cylinders as a result of uneven distribution of dust particles that pass through the air filter in the intake system. In order to acquire quantitative data on the effect of the structure of the intake system on the redistribution of dust in engine cylinders, the two-phase flow of air with dust particles in the standard elements of the intake system was mathematically modeled. ANSYS software package was used to solve the problem. A simulation technique was devised in which the airflow was first calculated to determine the boundary conditions for dust, after which the flow of air with particles was calculated. The calculations were carried out in a range of air velocities of 5‒20 m/s in branching channels with diversion angles of 45°, 90°, and 135° for the most characteristic particle sizes of 5‒30 µm. It has been estimated that dust particles deviate from the air streamlines by inertia and can slip through the lateral drain the stronger the larger particle size, diversion angle, and velocity of air. The comparison of the simulation results with experimental data confirmed that in the intake system of some engines, due to uneven particle distribution, there is local abrasive wear in one or more cylinders, which can significantly reduce the resource. This paper shows the need to take into consideration the centrifugation and redistribution of dust in the intake systems during the design, modernization, expert studies to determine the causes of faults associated with faulty operating conditions, as well as to clarify the regulations for the maintenance of existing engines.

Building a mathematical model of the destruction of a connecting rod-piston group in the car engine at hydraulic lock

“…It follows that the proposed model qualitatively corresponds to the studied process of loading parts with loads that are not provided for in the design of the engine and are caused by a violation of operating conditions. Such tasks are considered and solved in a set of expert research methods, including for other components and systems of engines, by developing models applicable under abnormal conditions and loads [26].…”

A Study on the Effect of Inlet Air Pollution on the Engine Component Wear and Operation

“…On the other hand, the authors of the paper [114] believe that the wear of the friction pair "cylinder-piston rings" and thus the durability of the internal combustion engine depends not only on the efficiency of the inlet air filtration and the wear resistance of the parts, but also on the design of the intake manifold. In the intake manifold of a multicylinder car engine (Figure 35a), due to the rapid twisting of the flowing air in the ducts and the associated effect of the inertial force on the dust particles, uneven distribution of the dust particles to the individual engine cylinders can occur, resulting in uneven wear of the piston-cylinder group.…”

“…In the intake manifold of a multicylinder car engine (Figure 35a), due to the rapid twisting of the flowing air in the ducts and the associated effect of the inertial force on the dust particles, uneven distribution of the dust particles to the individual engine cylinders can occur, resulting in uneven wear of the piston-cylinder group. Simulation studies were carried out in the air velocity range of 5-20 m/s in branched manifold channels with diversion angles of 45°, 90°, and 135° for the most characteristic particle sizes of 5-30 μm [114,115]. The computational results showed that the dust particles deviate from the air flow line due to inertia and can move through the side outlet the larger the particle size, channel deflection angle and air velocity-Figure 35b.…”

“…According to the author of the paper [116], the excessive presence of sulfur in the fuel may be the cause of additional corrosion wear of piston rings and cylinder liners, i.e., those engine elements which are in contact with exhaust gases. This type of corrosion wear caused by sulfuric acid intensifies when the engine is operated at low temperatures and Simulation studies were carried out in the air velocity range of 5-20 m/s in branched manifold channels with diversion angles of 45 • , 90 • , and 135 • for the most characteristic particle sizes of 5-30 µm [114,115]. The computational results showed that the dust particles deviate from the air flow line due to inertia and can move through the side outlet the larger the particle size, channel deflection angle and air velocity-Figure 35b.…”