Diesel Spray Liquid Length Imaging at High Pressure

Engine efficiency and emissions depend on the fuel atomization and dispersion. The fuel atomization and dispersion depend heavily on the ambient pressure and temperature. In this work, to study Diesel sprays in engine conditions, an electrically heated, constant-volume, pressurized vessel was designed and manufactured. The controlling electronics and software were developed and tested to ensure safe and precise operation. A commercial Bosch six-hole automotive Diesel injector was used. The spray spatial and temporal development were studied. In the literature, spray liquid length and cone angle are extensively used to quantify fuel dispersion. In this work, these parameters were quantified using a high-speed shadowgraph technique. Models were derived to describe the temporal evolution of the liquid core. Such models can be used to predict the Diesel spray behaviour and the engine performance.

Automated summary

In this study, an electrically heated, constant-volume, pressurized vessel was designed and manufactured to investigate Diesel sprays in engine conditions. The controlling electronics and software were developed to ensure safe and precise operation. The spray spatial and temporal development were analyzed using a high-speed shadowgraph technique, and models were derived to describe the temporal evolution of the liquid core, which can be used to predict the Diesel spray behavior and engine performance.