Development of a methodology for the prediction of the real volume in the combustion chamber of diesel engines using finite elements
DOI:
https://doi.org/10.17981/ingecuc.14.1.2018.11Keywords:
Adjustment, Strain, Diesel engine, Simulation, Instantaneous volumeAbstract
Introduction: Currently, diagnostic thermodynamic modeling in diesel engines is a widely-used tool which is based on the pressure data inside the cylinder. However, its study requires the adjustment of submodels through iterative processes that demand excessive time and high uncertainties. Among these submodels is the instantaneous volume in the combustion chamber, since the connecting rod is a highly deformable element due to its low modulus of rigidity and, therefore, this variation affects the mechanical expansion work calculated for the global energy balance.
Objective: In this study, are trying to implement a methodology for the characterization of the instantaneous volume in the combustion chamber oriented to its estimation in a fast and precise way using the ANSYS® software.
Methodology: The characterization of a diesel engine was performed using data of pressure measured in the cylinder corresponding to tests in drag (without combustion) for the regimes of 1000, 1700 and 2400 rpm.
Results: The results obtained in the simulation and experimentally validated indicate that the proposed methodology generates homoscedasticity in the Kdef adjustment coefficient, which has a value of 0.701 for the engine under study and remains almost constant regardless of the rotation regime.
Conclusions: It is also verified that a better prediction of the real volume of the combustion chamber with the developed methodology is achieved, while the proposed adjustment factor Kdef allows the adjustment of the theoretical model proposed and absorbs the uncertainties inherent to the modeling of this type of systems.
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