Political, environmental and marketing factors mean there is a global requirement to produce
vehicles with improved fuel economy and reduced emissions. This thesis shows that the gasoline
direct injection (GDI) engine will continue to form a significant portion of the automotive
propulsion market in the short to medium term. However, to reach future targets continuous
development and optimisation of these engines is essential. The introduction to this thesis
discusses the role some of the key aspects of GDI engine design have on overall engine efficiency.
The fuel spray is shown to be a key contributor to this, as it is a primary driver in the fuel/air mixing
process, and therefore intrinsically linked to the combustion efficiency. [Continues.]
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.