Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
CONSTRUCTAL DESIGN OF BIODIESEL/BIOGAS DRIVEN INTERNAL COMBUSTION ENGINES
Submission Author:
Sidyel Arcanjo , PR
Co-Authors:
Sidyel Arcanjo, JOSÉ VIRIATO COELHO VARGAS, Wellington Balmant
Presenter: Sidyel Arcanjo
doi://10.26678/ABCM.COBEM2019.COB2019-1684
Abstract
This paper aimed at to present and discuss the minimal exergy destruction for 4-strokes compression ignition internal combustion engines (CI-ICE) driven by biodiesel/biogas mixtures, subject to physical constraints, i.e., the CI-ICE constructal design. Geometric and operating parameters (e.g., rpm, piston and crank diameter, conrod-crank ratio, bore-stroke ratio, compression ratio, cutoff ratio, etc.) are the basis for the model equations, which are capable to calculate the indicated mean effective pressure, indicated power and torque with respect to crank speed. The second law equation (entropy generation rate) is developed at a mathematical model previously experimentally validated. The system mathematical model allows for the exploration of operational and design parameters following a constructal approach, where it is possible to achieve a functional and optimal design, i.e., maximum thermal efficiency and minimal exergy destruction. In this paper, the optimal cutoff ratio is shown as well as the compression ratio as a function of conrod-crank and bore-stroke ratio. In addition, the results are illustrated comparing the diesel and renewable alternative fuels (biodiesel/biogas mixtures only). In conclusion, this model can be a useful tool for simulation, design, and optimization of CI-ICE for any combination of diesel, biodiesel, and biogas fuels.
Keywords
cutoff ratio, Biodiesel/Biogas, Constructal Design, exergy destruction rate, Variable Compression Ratio
