Within the unit Combustion and Spray, a major focus is on modeling and improving the injection and combustion process. In the combustion process, the chemical energy in the fuel is converted to thermal energy which drives the engine. This is done by injecting the fuel under high pressure and creating a cloud of fuel droplets in the engine. This fuel-air mixture can then ignite to create efficient combustion.
How efficient the combustion is and what emissions are created are very dependent on the injection process, for example the control and how it affects the mixture, the injection pressure and the timing of injection. A detailed understanding of spray formation, how a fuel spray is broken down into droplets which evaporates and is mixed with air, and the properties of the injectors is thus crucial for creating efficient injection systems for renewable fuels and future engine concepts.
World class spray lab
Chalmers’ world class spray lab provides good opportunities for using innovative methods to investigate sprayers and combustion properties at different pressures and temperatures. Examples of methods used are planar laser-sheet imaging, laser-induced fluorescence and high-speed cameras. The focus is on exploring and developing models for turbulent combustion, improving the injection process, combustion of different fuels and reducing emissions. The results from Combustion and Spray are then used to develop and model entire engines and powertrains.