Air and fuel supercharge in the performance of a diesel cycle engine/Sobrealimentacao de ar e combustivel no desempenho de um motor ciclo Diesel

• Published in: Ciência rural 2017-06, Vol.47 (6)
• Main Authors: de Farias, Marcelo Silveira, Schlosser, Jose Fernando, Ma, Santos, Gustavo Oliveira dos, Estrada, Javier Solis
• Format: Article
• Language: Spanish
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20161117

This paper aimed to evaluate the performance of a Diesel cycle engine, changing the configurations for the air and fuel supply system. Variables analyzed were torque, power, specific fuel consumption and thermal efficiency in four different engine configurations (aspirated, aspirated + service, turbocharged + service and turbocharged). For that, there were dynamometer experiments by power takeoff of an agricultural tractor. The experimental outline used was entirely randomized, in a bifatorial design with three repetitions. Results indicated that the engine supercharge, compared to its original configuration, provided a significant increase of torque and power. Only the addition of turbo does not caused a significant effect in the engine performance. Application of turbocharger provides an improvement in the burning of the air/fuel mixture, which favors the increase of engine power and; consequently, reduced the specific fuel consumption. Key words: agricultural tractor, turbocharger, injection pump, fuel consumption. Este trabalho teve como objetivo avaliar o desempenho de um motor ciclo Diesel, alterando a configuragao do sistema de alimentagao de ar e de combustivel. As variaveis analisadas foram torque, potencia, consumo especfico de combustivel e eficiencia termica em quatro diferentes configuragoes do motor (aspirado, aspirado + servigo, turboalimentado + servigo e turboalimentado). Para isso, foram realizados experimentos dinamometricos por meio da tomada de potencia de um trator agricola. O delineamento experimental utilizado foi inteiramente casualizado, em desenho bifatorial com tres repetigoes. Os resultados indicam que, a sobrealimentagao do motor, em relagao a configuragao original, proporciona aumento significativo do torque e potencia. Somente a adigao de turbo nao causa efeito significativo no desempenho do motor. A aplicagao do turbocompressor proporciona melhoria na queima da mistura ar/combustivel, o que favorece o aumento da potencia do motor e, consequentemente, reduz o consumo especifico de combustivel. Palavras-chave: trator agricola, turbocompressor, bomba injetora, consumo de combustivel.