Numerical Analysis of the Forces on the Components of a Direct Diesel Engine

Nguyen, Dung Viet; Duy, Vinh Nguyen

doi:10.3390/app8050761

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…It is known that the force (moment) of friction that occurs in the pairing of the pin with the connecting rod and piston is not taken into consideration in the classical theory in any way, they are neglected due to their smallness in comparison with other acting forces [18,19]. The classical theory is actually built on the absence of friction in the conjugation of the pin [20,21]. However, what is permissible under normal loads can give a big mistake when the operating conditions of the car are violated.…”

Section: Determining and Studying The Ranges Of Loads And Deformation...mentioning

confidence: 99%

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

Khrulev

Saraiev

2022

EEJET

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This paper investigates the process of destruction of parts of the connecting rod-piston group of the engine due to hydraulic lock after the ingress of liquid into the cylinders of the engine. Comparing expert data on actual engine destruction due to hydrolock with existing estimation models has made it possible to identify a number of significant contradictions affecting the objectivity and accuracy of the destruction assessment. To resolve the existing contradictions, a mathematical model for reconstructing the destruction of the connecting rod-piston group of the engine during a hydraulic lock has been improved. Unlike the existing ones, the model makes it possible to take into consideration not only the static deformation of the connecting rod but also to give a comprehensive assessment of the deformations of the connecting rod, piston pin, and piston at different volumes of hydrolock fluid. Underlying the model is the hypothesis assuming that the deformation of the piston pin under excessive load caused by hydraulic lock leads to the emergence of tension and an increase in the friction in the mated pin-piston. The calculation from the condition of differential change in the amount of friction in the mated pin-piston produced a satisfactory result that does not contradict the practical data and has confirmed the working hypothesis. By calculation, the onset of the destruction of engine parts during hydrolock at a pressure in the cylinder close to 17.3 MPa, at a crankshaft angle of about 346°, was revealed. In addition, it was found that in the case of violating the operating conditions, due to friction, the mated pin-piston is exposed to the lateral force on the skirt that reaches 17.2 MPa, which exceeds the permissible one, calculated according to known procedures, by 2.8 times. The results reported here are confirmed by known practical data, which makes the devised model applicable to the practice of expert studies into the causes of engine malfunctions when violating the operating conditions of a car

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Section: Determining and Studying The Ranges Of Loads And Deformation...mentioning

confidence: 99%

“…In (21), it is necessary to clarify the area of contact f. When ovalized, the pin deforms the hole, but not along the entire circumference, since it is originally installed in a hole with a small gap, which in the hot state is usually about Δ = 0.020 mm.…”

Section: Determining and Studying The Ranges Of Loads And Deformation...mentioning

confidence: 99%

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

Khrulev

Saraiev

2022

EEJET

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“…Therefore, it is important to work with sufficiently simple yet accurate models. The current study was done with the ANSYS mechanical software, which is able to study liner deformation [22][23][24][25][26]. It is attractive due to its capability of handling dynamic, thermal, material, geometric, and contact nonlinearities in the finite element model.…”

Section: Physical and Computational Modelmentioning

confidence: 99%

Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study

et al. 2020

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Reducing friction is an important aspect to increase the efficiency of internal combustion engines (ICE). The majority of frictional losses in engines are related to both the piston skirt and piston ring–cylinder liner (PRCL) arrangement. We studied the enhancement of the conformation of the PRCL arrangement based on the assumption that a suitable conical liner in its cold state may deform into a liner with nearly straight parallel walls in the fired state due to the impact of mechanical and thermal stresses. Combining the initially conical shape with a noncircular cross section will bring the liner even closer to the perfect cylindrical shape in the fired state. Hence, a significant friction reduction can be expected. For the investigation, the numerical method was first developed to simulate the liner deformation with advanced finite element methods. This was validated with given experimental data of the deformation for a gasoline engine in its fired state. In the next step, initially conically and/or elliptically shaped liners were investigated for their deformation between the cold and fired state. It was found that, for liners being both conical and elliptical in their cold state, a significant increase of straightness, parallelism, and roundness was reached in the fired state. The combined elliptical-conical liner led to a reduced straightness error by more than 50% compared to the cylindrical liner. The parallelism error was reduced by 60% to 70% and the roundness error was reduced between 70% and 80% at different liner positions. These numerical results show interesting potential for the friction reduction in the piston-liner arrangement within internal combustion engines.

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“…This broad use has resulted in a growing demand for petroleum-based diesel [1][2][3][4][5]. However, global fossil-fuel reserves have become limited due to rising fuel prices, depleting petroleum reserves and issues related to atmospheric pollution [4][5][6][7][8][9]. As a result, many researchers have concentrated on the discovery of renewable, carbon-neutral, and environmentally-friendly non-petroleum-based diesel in recent years [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Waste Cooking Oil via Recycling as Biofuel for Diesel Engines

Xa¹,

Viet

Duc

et al. 2020

Recycling

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In this study, waste cooking oil (WCO) was used to successfully manufacture catalyst cracking biodiesel in the laboratory. This study aims to evaluate and compare the influence of waste cooking oil synthetic diesel (WCOSD) with that of commercial diesel (CD) fuel on an engine’s operating characteristics. The second goal of this study is to compare the engine performance and temperature characteristics of cooling water and lubricant oil under various engine operating conditions of a test engine fueled by waste cooking oil and CD. The results indicated that the engine torque of the engine running with WCOSD dropped from 1.9 Nm to 5.4 Nm at all speeds, and its brake specific fuel consumption (BSFC) dropped at almost every speed. Thus, the thermal brake efficiency (BTE) of the engine fueled by WCOSD was higher at all engine speeds. Also, the engine torque of the WCOSD-fueled engine was lower than the engine torque of the CD-fueled engine at all engine speeds. The engine’s power dropped sequentially through 0.3 kW, 0.4 kW, 0.6 kW, 0.9 kW, 0.8 kW, 0.9 kW, 1.0 kW and 1.9 kW.

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Numerical Analysis of the Forces on the Components of a Direct Diesel Engine

Cited by 9 publications

References 18 publications

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

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

Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study

Utilization of Waste Cooking Oil via Recycling as Biofuel for Diesel Engines

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