Diagnosis of hydrous ethanol combustion in a spark-ignition engine

Autor(es)

Rufino, Caio H. ^[1] ; Gallo, Waldyr L. R. ^[2] ; Ferreira, V, Janito

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Mech Engn, Lab Biofuel Engines, BR-13083970 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Dept Energy, Sch Mech Engn, Campinas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING; v. 235, n. 1 JUL 2020.
• Citações Web of Science: 0

Resumo

By evaluating combustion duration and flame development, it is possible to evaluate the effects of utilizing a new type of fuel. This allows for optimization of the operational parameters such as the ignition timing, air-fuel ratio, and throttle opening with respect to efficiency, knock, emissions, and performance. In this work, the combustion of a Brazilian hydrous ethanol fuel was evaluated in a commercial flexfuel engine. Investigations were conducted by performing a heat release analysis of the experimental data and providing combustion characteristics. The experimental design comprised of variations in engine speed, load, ignition timing, and air-fuel ratio under lean condition. The results indicated the relationship between the engine parameters and combustion characteristics under a wide range of operational conditions, and identified the relationship between the physical characteristics of the fuels and their combustion in the commercial engine. For high engine speed, lean combustion presented a similar duration to the stoichiometric combustion duration. When comparing the combustion characteristics obtained for the hydrous ethanol with gasoline combustion, the main differences noted were reduced sensitivity to detonation and a shorter duration of combustion, although the temperature at the start of combustion was lower for ethanol. In addition to shorter combustion duration, ethanol presented a lower value for the Wiebe exponent. The results obtained from the combustion duration values and Wiebe function parameters enable the composition of a set of data required for a simplified combustion simulation. (AU)

• Processo FAPESP: 18/18859-1 - Estudo conceitual de um motor com cilindrada e taxa de compressão ajustáveis
• Beneficiário: Caio Henrique Rufino
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto