Indian Journal of Science and Technology

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Study of the Influence of Compression Ratio on the Rate of Heat Release in Small Displacement Diesel Engines


Affiliations
1 Mechanical Engineering Department, DIMER Research Group, Universidad del Atlantico, Barranquilla, Colombia
2 Mechanical Engineering Department, KAI Research Group, Universidad del Atlantico, Barranquilla, Colombia
3 Chemical Engineering Department, Sustainable Chemical and Biochemical Processes Research Group, Universidad del Atlantico, Barranquilla, Colombia
 

Background/Objectives: To make implementation of a thermodynamic diagnostic model to determine the rate of heat release in low displacement Diesel engines so that the performance of the combustion process can be quantified and sub-models of heat transfer can be adjusted; so that it can be applied in subsequent predictive modeling. Methods: With the pressure data in the combustion chamber and the set of variables composed of the pressure and temperature in the admission, fuel consumption, speed of rotation, injection pressure, compression ratio and environmental conditions, a thermodynamic model is defined. It allows quantifying how the heat release process occurs in the combustion process. Findings: The results allow verifying the influence of the compression ratio on the heat release process, finding that the rate of heat released increases with the increase of the variable under study. Likewise, it is verified that the most pronounced difference between the release rates for different compression ratios studied is in the premix combustion zone. Application: This methodology can be used for the process of optimization and redesign of thermal engines, to maximize the output power for the same fuel and operational conditions.
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  • Study of the Influence of Compression Ratio on the Rate of Heat Release in Small Displacement Diesel Engines

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Authors

Jorge Duarte Forero
Mechanical Engineering Department, DIMER Research Group, Universidad del Atlantico, Barranquilla, Colombia
Guillermo E. Valencia
Mechanical Engineering Department, KAI Research Group, Universidad del Atlantico, Barranquilla, Colombia
Luis G. Obregon
Chemical Engineering Department, Sustainable Chemical and Biochemical Processes Research Group, Universidad del Atlantico, Barranquilla, Colombia

Abstract


Background/Objectives: To make implementation of a thermodynamic diagnostic model to determine the rate of heat release in low displacement Diesel engines so that the performance of the combustion process can be quantified and sub-models of heat transfer can be adjusted; so that it can be applied in subsequent predictive modeling. Methods: With the pressure data in the combustion chamber and the set of variables composed of the pressure and temperature in the admission, fuel consumption, speed of rotation, injection pressure, compression ratio and environmental conditions, a thermodynamic model is defined. It allows quantifying how the heat release process occurs in the combustion process. Findings: The results allow verifying the influence of the compression ratio on the heat release process, finding that the rate of heat released increases with the increase of the variable under study. Likewise, it is verified that the most pronounced difference between the release rates for different compression ratios studied is in the premix combustion zone. Application: This methodology can be used for the process of optimization and redesign of thermal engines, to maximize the output power for the same fuel and operational conditions.

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DOI: https://doi.org/10.17485/ijst%2F2018%2Fv11i21%2F123236