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Article

Numerical Methodology for Determining the Energy Losses in Auxiliary Systems and Friction Processes Applied to Low Displacement Diesel Engines

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Programa de Administración de Empresas, Universidad Francisco de Paula Santander, Avenida Gran Colombia No. 12E-96 Barrio Colsag, San José de Cúcuta 540001, Colombia
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Programa de Ingeniería Civil, Universidad Francisco de Paula Santander, Avenida Gran Colombia No. 12E-96 Barrio Colsag, San José de Cúcuta 540001, Colombia
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Facultad de Ingeniería, Universidad Francisco de Paula Santander, Sede el Algodonal Vía Acolsure, Ocaña-Norte de Santander 546551, Colombia
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Author to whom correspondence should be addressed.
Lubricants 2020, 8(12), 103; https://doi.org/10.3390/lubricants8120103
Received: 29 October 2020 / Revised: 2 December 2020 / Accepted: 2 December 2020 / Published: 3 December 2020
The problem of climate change and the reduction of fossil fuels has motivated the development of research focused on improving the efficiency of internal combustion engines. This research proposes a methodology based on mathematical models to determine the energy losses caused by auxiliary systems and friction processes in the engine. Therefore, models are proposed for calculating the energy losses in fuel injection, lubrication, and cooling system. In the same way, models are proposed for the energy losses due to friction in the piston, valve train, and bearings. Experimental tests are carried out on a single-cylinder diesel engine under different operating conditions to validate the proposed models. The results showed that the energy losses of the fuel injection, lubrication, and coolant system are equal to 0.61%, 0.30%, and 0.31% of the chemical energy of the injected fuel. In the case of the energy losses by friction processes, the piston, valve train, and bearings represent 5.47%, 1.34%, and 1.85% of the fuel energy, respectively. Additionally, the proposed model allows estimating the minimum lubrication film present in the piston, valve train, and bearings, which in the particular case of the present study were 0.63 µm, 0.10 µm, and 0.57 µm, respectively. In general, the methodology developed in the present work stands as a robust tool to evaluate the modifications and/or designs of auxiliary systems and friction processes to reduce the energy losses and protect the system from wear caused by lubrication problems. Additionally, the methodology allows evaluating the effect of different types of fuels on the lubrication conditions of the piston and the crankshaft bearings. View Full-Text
Keywords: auxiliary systems; energy losses; friction; hydrodynamic; lubrication; tribological performance auxiliary systems; energy losses; friction; hydrodynamic; lubrication; tribological performance
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MDPI and ACS Style

Abril, S.O.; Piero Rojas, J.; Flórez, E.N. Numerical Methodology for Determining the Energy Losses in Auxiliary Systems and Friction Processes Applied to Low Displacement Diesel Engines. Lubricants 2020, 8, 103. https://doi.org/10.3390/lubricants8120103

AMA Style

Abril SO, Piero Rojas J, Flórez EN. Numerical Methodology for Determining the Energy Losses in Auxiliary Systems and Friction Processes Applied to Low Displacement Diesel Engines. Lubricants. 2020; 8(12):103. https://doi.org/10.3390/lubricants8120103

Chicago/Turabian Style

Abril, Sofia O., Jhan Piero Rojas, and Eder N. Flórez 2020. "Numerical Methodology for Determining the Energy Losses in Auxiliary Systems and Friction Processes Applied to Low Displacement Diesel Engines" Lubricants 8, no. 12: 103. https://doi.org/10.3390/lubricants8120103

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