Influence of the Inlet System Design on Dust Centrifugation and the Parts Wear of the Modern Internal Combustion Engines

Khrulev, Alexander; Дмитриев, С. А.

doi:10.20998/0419-8719.2020.2.10

Cited by 2 publications

(4 citation statements)

References 2 publications

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“…Experience shows that the specific abrasive wear due to the centrifugation of dust in branching channels is observed in the real ICE structures [22,23]. This wear is particularly severe when operating conditions are violated, from minor violations of engine maintenance regulations and late replacement of the air filter to the improvised modernization of the engine by installing non-regular air filters.…”

Section: Discussion Of Modeling Results and Comparison With Experimental Datamentioning

confidence: 99%

“…In particular, with the increase in the air velocity, despite the increase in aerodynamic forces, the inertia of particles increases significantly, and the stronger the larger the size and mass of the particle. That causes the trajectories of the particles to deviate from the air streamlines [22]. If small particles follow the air streamlines even at large angles of the flow deviation, at high rates the particles slip past the outlet even at small angles.…”

Section: Discussion Of Modeling Results and Comparison With Experimental Datamentioning

confidence: 99%

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

Saraiev

Khrulev

2021

EEJET

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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.

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Section: Discussion Of Modeling Results and Comparison With Experimental Datamentioning

confidence: 99%

Section: Discussion Of Modeling Results and Comparison With Experimental Datamentioning

confidence: 99%

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

Saraiev

Khrulev

2021

EEJET

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“…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.…”

Section: Components Of Dust Percent By Weight [%]mentioning

confidence: 99%

“…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.…”

Section: Components Of Dust Percent By Weight [%]mentioning

confidence: 99%

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

Dziubak

2022

Energies

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This paper systematically reviews the research progress in the field of the influence of air pollutants in the engine inlet on the accelerated wear of the elements of the association: piston, piston rings, cylinder liner (P-PR-CL), and plain bearing (journal–panel). It was shown at the outset that the primary component of air pollution is road dust. Its main components are dust grains of hard minerals (SiO2, Al2O3), which penetrate the oil film area between two frictionally mating surfaces causing their abrasive wear. Therefore, the effect of three dust parameters (grain size and hardness, and dust concentration in air) on the accelerated wear of the friction pair: piston, piston rings, cylinder liner(P-PR-CL), and plain bearing (journal–pan) is presented extensively. It was noted that the wear values of the same component were obtained by different researchers using different testing techniques and evaluated by different indices. It has been shown that the greatest wear of two frictionally cooperating surfaces is caused by dust grains with sizes equal to the thickness of the oil film at a given moment, which in typical combustion engine associations assumes varied and variable values in the range of 0–50 µm. The oil film thickness between the upper ring and the cylinder liner varies and depends on the crankshaft rotation angle, engine speed and load, and oil viscosity, and takes values less than 10 µm. It was shown that the maximum wear of the cylinder liner, resulting from the cooperation with the piston rings, occurs in the top dead centre (TDC) area and results from unfavorable (high temperature, low piston speed) operating conditions of these elements. From the extensive literature data cited, it follows that abrasive wear is caused by dust grains of specific dimensions, most often 5–20 µm, the greater the wear the greater the hardness of the grains and the sulfur content of the fuel. At the same time, it was shown that the main bearing, crankshaft bearing, and oil ring experienced maximum wear by a different range of particle size, respectively: 20–40, 5–10, and 20–80 μm. It was shown that the mass of dust that enters the engine cylinders and thus the wear of the components is determined by the concentration of dust, the value of which is definitely reduced by the air filter. However, it was pointed out that the low initial filtration efficiency and the presence of large dust grains in the purified air in the initial period of the filter operation (after replacement of the filter element with a new one) may have an impact on the accelerated wear of mainly (P-PR-CL) association. The next stage of the paper presents the effects of excessive wear of the cylinder liner and piston rings of the engine, resulting from actual vehicle operation and bench tests on the decrease in compression pressure and engine power, increase in the intensity of exhaust gas blow-by into the oil sump and increase in oil consumption and exhaust gas toxicity. This paper addresses the current problem of the effect of engine inlet air contaminants on the performance of the air flow meter, which is an essential sensor of the modern internal combustion engine. The phenomenon of deposition of contaminants (mineral dust, salt, carbon deposit, and moisture) on the measuring element (wire or layer anemometer) of the air flow meter has been analyzed. The empirical results presented show that the mineral dust layer on the measuring element of the air flow meter causes a 17.9% reduction in output voltage, and the dust and oil layer causes a 46.7% reduction in output voltage. This affects the decrease in engine power and exhaust toxicity.

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Influence of the Inlet System Design on Dust Centrifugation and the Parts Wear of the Modern Internal Combustion Engines

Cited by 2 publications

References 2 publications

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

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

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

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