Projeto de cabeçote para testes e desenvolvimento de estratégia Ultra High Pressure Direct Injection

Abstract

Given the growing concern about polluting and greenhouse gases, vehicle emission limits are becoming increasingly restrictive. Therefore, the development of more efficient internal combustion engines becomes necessary. One of the strategies used for efficiency rising in Otto cycle engines is the fuel direct injection. Howeverdespite benefiting the efficiency increase, this strategy promotes the formation of pollutant species characteristic of poor mixture formation. Thus, the use of ultra-high injection pressures has been investigated to mitigate the disadvantages associated with this strategy, since with higher pressures, the fuel droplets have a lower surface/volume ratio, improving vaporization. Hence, the present work aims to develop a prototype of a monocylindric cylinder head, based on a commercial model Stellantis GSE T4, to, together with other universities, evaluate the use of ultra-high fuel injection pressures using ethanol as fuel. Some geometric restrictions were carried out due to the manufacturing methods, the restrictions pointed out by other universities, the production costs and the time available for the execution of the project. In this way, the project sought to better represent the operation of the original engine so that it could become comparative with the data acquired by other institutions enabling the experimental study of ultra-high pressure direct injection strategy.