Výzkum primární atomizace konického kapalného filmu produkovaného vysokotlakým vířivým GDI vstřikovačem

Investigation into Primary Break Up of Conical Liquid Sheets Produced by a Pressure Swirl Gasoline Direct Injector.

článek ve sborníku ve WoS nebo Scopus

en

The fuel break up and atomisation processes in the near nozzle region of a second generation high pressure-swirl direct injection gasoline fuel injector have been characterised. The Phase Doppler technique has been used to measure the axial and radial droplet velocities and the resultant flow angles of the fuel droplets. Mean estimates based on time bin averaging the data over 20 microsecond time bins have shown that, during the transient formation of the hollow fuel cone there is a distinct high frequency fluctuation in the mean flow angle. Images of the spray cone have confirmed the fluctuations found by the PDA analysis and suggest that the phenomenon is due to waves in the spray cone which can be attributed to the instabilities behind the break up of the conical liquid sheet.

Je zkoumána atomizace paliva v blízkosti trysky u druhé generace vysokotlakého GDI vstřikovače Pro měření axiální a radiální rychlosti a výsledného úhlu proudění kapek spreje je použita PDA technika. Střední odhady založené na hodnocení dat v časových úsecích po 20us ukazují vysokofrekvenční fluktuaci úhlu kuželu spreje ve počáteční fázi vstřiku. Vizualizace tyto výsledky potvrzuje a naznačuje, že je tento jev spojen s nestabilitami při rozpadu kapalného filmu.

The fuel break up and atomisation processes in the near nozzle region of a second generation high pressure-swirl direct injection gasoline fuel injector have been characterised. The Phase Doppler technique has been used to measure the axial and radial droplet velocities and the resultant flow angles of the fuel droplets. Mean estimates based on time bin averaging the data over 20 microsecond time bins have shown that, during the transient formation of the hollow fuel cone there is a distinct high frequency fluctuation in the mean flow angle. Images of the spray cone have confirmed the fluctuations found by the PDA analysis and suggest that the phenomenon is due to waves in the spray cone which can be attributed to the instabilities behind the break up of the conical liquid sheet.

chybejici klicova slova v CJ, Micek 10. 1. 2006

spray quality, liquid break up, pressure swirl gasoline direct injector, spray cone

2005

01.01.2005

Laboratoire de Combustion et Systemes Reactifs, CNRS Orleans

Orleans, France

Proceedings 20th Annual Conference on Liquid Atomization and Spray Systems

6