Preface

An injection process is a common technical practice used in various fields of industry. It disperses liquid droplets evolving them into the output spray; the whole process is generated accordingly to the rules of break‐up liquid stream phenomena. As a result the surface area of the liquid is considerably increased. Also the area covered by injection borders can be fast penetrated and uniformly filled by the liquid. For these reason injection processes are used practically in all energy conversion technologies that are based on combustion of liquid fuel, but also a gaseous and loose solid one. They permit fast fuel distribution, vaporization, and burning, and, consequently, rapid and efficient combustion.

The same is valid and very important of internal combustion engine (ICE) operation. Thus the injection processes are almost solely used for fuelling the combustion chamber of ICE. Presently, due to the intensive development that has taken place since 80ʹs of XXth century, both compression ignition and spark ignition engines are "injection" engines. Their injection system pattern consisting of highly efficient and strength pumping devices together with complex control systems and reliable injector units generate high pressurized and fine atomized fuel sprays which are directly injected into the combustion chamber. Particularly, diesel engine injection systems belong to the true state‐of‐the‐art technology, providing the pressure of injection up to 200 MPa and accurate multi‐split of single cycle amount of fuel injected. Therefore it is possible to meet the restrictive exhaust emission legislations by the engines.

The consecutive book of "Fuel injection" series discusses the various fuel injection issues in internal combustion engine applications. It aims to present research applied for better understanding current fuel injection hitches. Namely, chapters 1 to 2 deal with significance of physical and chemical fuel properties to injection system design and operation. Next two chapters – 3 to 4 – are focused on effects of fuel injection parameters on engine emission and combustion, including premixed charge compression ignition (PCCI) engine operation strategy. The last two chapters 5 to 6 show the numerical studies for simulation injection processes. Some fuel parameters and injection system design factors are investigated, also with use

#### XII Preface

CFD methods, targeting spray penetration, evaporation, and cavitation phenomena.

Editors
