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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
ANALYSIS OF THE THERMAL EFFICIENCY OF A DIESEL ENGINE OPERATING IN DIESEL AND ETHANOL DUAL-FUEL MODE
Submission Author:
Lucindo Soares Pereira , RS
Co-Authors:
Lucindo Soares Pereira, Paulo Roberto Wander, Josimar Souza Rosa
Presenter: Lucindo Soares Pereira
doi://10.26678/ABCM.ENCIT2020.CIT20-0490
Abstract
This study evaluates the thermal efficiency of a single-cycle diesel engine coupled to a three-phase electric power generator with constant load. The behavior of the engine operating in dual-fuel mode, S-10 diesel oil and ethanol was analyzed using the ethanol fumigation technique by the air intake manifold. The tests consisted of changing the proportions of fuel mass supplied to the engine, by controlling the opening time of the ethanol injection nozzle and the accelerator that controls the diesel fuel injection pump, keeping the engine rotation constant. The data to perform the analyzes were collected from load cells installed in the fuel tanks and from a pressure transducer installed inside the combustion chamber, from which it was possible to generate the real cycle of the engine through the pressure versus diagram. volume. After analyzing the collected data, it was possible to determine the thermal efficiency of the engine for each test performed, it was noted a reduction in thermal efficiency according to the increase in the proportion of ethanol, due to the delay in the start of combustion and the reduction of the temperature of admission, both factors influenced by ethanol fumigation. These factors interfered with the combustion efficiency, compromising the complete burning of the fuel. Another factor that was also observed was the increase in specific fuel consumption, due to the difference in calorific value between diesel oil and ethanol.
Keywords
Thermal Efficiency, ethanol fumigation, Diesel cycle
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