Combustion chamber of the Diesel engine—theory and numerical simulation

The results of a comparative numerical simulation of combustion and formation of toxic substances in a diesel engine combustion chamber are given. Experimental findings were used to identify the mathematical models. The impact of the standard, RNG and realizable k-ε turbulence models on the accuracy of numerical simulation of combustion and the formation of toxic substances was studied. The realizable k-ε turbulence model was shown to provide a closer agreement of computational and experimental data during simulation of the diesel engine process when turbulent flows are described.

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Numerical Simulation of The Flow in a Symmetrical Deep-Bowl Combustion Chamber of a Diesel Engine Cylinder during The Compression Stroke.(Dept.M)

MEJ. Mansoura Engineering Journal ◽

10.21608/bfemu.2021.175903 ◽

2021 ◽

Vol 12 (2) ◽

pp. 20-30

Author(s):

M. El-Kady ◽

H. Mascheck ◽

A. Hoche

Keyword(s):

Numerical Simulation ◽

Diesel Engine ◽

Combustion Chamber ◽

Compression Stroke ◽

Engine Cylinder

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Modified quasi-stationary method for studying changes in transition temperatures of diesel engine pistons coated with heat-shielding materials

Proceedings of Irkutsk State Technical University ◽

10.21285/1814-3520-2020-5-954-965 ◽

2020 ◽

Vol 24 (5) ◽

pp. 954-965

Author(s):

Mahmood Al-Bdeiri ◽

◽

Vladimir Krasilnikov ◽

Sergey Sergeev ◽

◽

...

Keyword(s):

Numerical Simulation ◽

Finite Element ◽

Diesel Engine ◽

Heat Flow ◽

Combustion Chamber ◽

Oxide Coating ◽

Maximum Temperature ◽

State Equations ◽

Plasma Method ◽

Piston Head

The purpose of the work is to identify complex transient heat flow paths in the combustion chamber of engine, significantly improve the models of diesel engine heat flow, and study the effect of aluminum oxide coating by the galvanic plasma method on short-term and long-term reactions of the piston head. The analysis of operation of aluminum alloy coated diesel engine piston is carried out using a modified quasi -steady method and a finite element method. A thermodynamic analysis is presented using energy and state equations with corresponding gas heat transfer. Time-dependent boundary conditions are set on the gas-blown surfaces of 2D finite element transition models of combustion chamber components. It is shown that this methodology can reveal complex transient paths of the heat flow in engine combustion chambers and distribution details of heat losses in various cooling media. Numerical simulation has shown that the maximum temperature increase relative to the uncoated piston is 64.3% for the coating thickness of 0.13 mm. Tests have shown that the coatings can endure up to 280 thermal cycles. It is found out that predictions of numerical simulation are in good agreement with the results of experiments conducted with repaired pistons. The experimental operation of Cummins КТА 38 engines at Chernogorsk and Vostochno-Beysk coal mines has shown that the engine equipped after repair with the piston coated with aluminum applied by the galvanic plasma method has been in operation for 2 years and 3 months, whereas its set overhaul period is 18,000 hours. Therefore, the proposed methodology allows to reduce temperature variations in the piston and, thereby increase the service life of engine pistons coated with the use of the thermal barrier coating technology.

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