INTRODUCTION The different volatility of the components of a fuel mixture will result in different vaporization rates of components at the droplet surface, and the fuel becomes non-uniform inside the liquid phase because of the mass diffusion resistance inside the droplet. For practical, multidimensional simulations of IC engines, zero-dimensional models for the liquid phase are necessary becau...

In this paper a numerical approach for the prediction of the unsteady atomization process of liquid fuel in Diesel engine is presented. The dependences between the transient nozzle flow and spray formation are analysed. For that purpose models to simulate unsteady nozzle flows including the transient behaviour of cavitation and two-phase atomization process are employed. Results of transient fl...

The spray formation and breakup of n-dodecane was investigated experimentally on a common rail diesel injector using a long working distance microscope. The objectives were to further the fundamental understanding of the processes involved in the initial stage of diesel spray formation under engine-like operating conditions, i.e. high ambient pressure and temperature. Present measurements show ...

Experiments are performed to investigate the effects of fuel spray on in-cylinder mixture preparation and its impingement on cylinder walls and piston top inside a direct-injection spark-ignition engine with optical access to the cylinder. Novel image processing algorithms are developed to analyze the fuel impingement quantitatively on in-cylinder surfaces. The technique is useful to optimize t...

Robust manufacturing of micro parts at high throughput needs tailored concepts and methods to assure unchanging work piece quality. An actual challenge is the dimensional metrology with meso-to-microscopic high-aspect ratio features of micro-system components, e.g. micro gears for watches and micro motors, ferrules of optical fibers, hollow microneedles for painless drug delivery into living ce...

Understanding and controlling mixing and combustion processes is fundamental in order to face the challenges set by the ever more demanding pollutant regulations and fuel consumption standards of direct injection diesel engines. The fundamentals of these processes haven been long studied by the diesel spray community from both experimental and numerical perspectives. However, certain topics, su...

The combination of emulsified diesel and low temperature combustion (LTC) technology has great potential in reducing engine emissions. A visualization study on the spray and combustion characteristics of water emulsified diesel was conducted experimentally in a constant volume chamber under conventional and LTC conditions. The effects of ambient temperature on the evaporation, ignition and comb...