Experimental analysis between performance parameters for an internal combustion engine fueled by gasoline and ethanol when submitted to engine block vibration.

Abstract

Ethanol and gasoline are widely used as fuels in Otto cycle engines. These fuels have diferent heating power and octane numbers and the engine behaves diferently depending on the type of fuel used. The objective of this study is to measure, compare and investigate the factors that afect the block vibration of an internal combustion engine, which uses ethanol or gasoline as its fuel, as a function of shaft torque and shaft power engine, main efective pressure, advanced ignition, pressure combustion engine and other parameters. The experiment consisted of instrumenting the side of the engine block with a triaxil accelerometer to measure the level of the vibration acceleration value of the engine running on a bench dynamometer, while varying the engine speed under full load conditions. The results showed that the engine vibration level was infuenced by engine speed, load, type of fuel and performance parameters of the engine. The highest level of vibration was noted in the region of maximum torque and maximum pressure combustion. The combustion process is primarily responsible for the highest level of vibration reached when using ethanol as a fuel. Under all operating conditions, the vibration level of the engine block was highest when using ethanol. On average, the longitudinal, vertical and transverse engine vibration was 3%, 31% and 56% higher in the engine running on ethanol compared to the engine run on gasoline. This study holds relevance as it correlates the longitudinal, vertical and transverse vibration level of the block of an internal combustion engine, as is found in an engine combustion process fueled by ethanol and gasoline.