In this work investigations of the flow-field inside and around a heated, vaporizing diesel-fuel-jet are presented. The experiments are carried out in a high-pressure-chamber at elevated temperatures using a commercial Bosch-Common-Rail Diesel-injection system. The pressure and temperature inside the chamber are chosen according to the conditions in a real engine cylinder after compression. Droplet diameters and velocities inside the fuel jet are measured by means of Phase-Doppler-Anemometry (PDA). In order to obtain the velocities of the gas phase very close to the free penetrating fuel jet by Laser-Doppler-Anemometry (LDA), the air inside the chamber is seeded with Titan-Dioxide (TiO2)-particles. Turbulence values like RMS and length scales are derived from these measurements. In addition to these spatially limited measurements the global flow-field around the penetrating fuel-jet is observed by two-dimensional measurements with Particle-Image-Velocimetry (PIV). From the nozzle exit up to 2/3 of the whole penetration length an air flow perpendicular to the spray axis can be detected. This air-flow into the spray provides the heat transfer and vaporization of the fuel-droplets. The fuel jet contains a high droplet concentration which leads to high intensities in the resulting PIV-images from which discrete spray contours can be calculated. By means of the gas-flow velocity components at this contour the total mass of the absorbed air is calculated. This mass is compared at three injection pressures: 80, 100 and 135 MPa. Further experiments concentrate on a spray impinging straight onto a flat wall. The wall jet leads to additional contributions of air absorption into regions with high droplet concentrations.
- Internal Combustion Engine Division
Experimental Investigation of the Turbulent Flow Field of Vaporizing Diesel-Sprays
- Views Icon Views
- Share Icon Share
- Search Site
Staudt, M, Meingast, U, & Renz, U. "Experimental Investigation of the Turbulent Flow Field of Vaporizing Diesel-Sprays." Proceedings of the ASME 2002 Internal Combustion Engine Division Fall Technical Conference. Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components. New Orleans, Louisiana, USA. September 8–11, 2002. pp. 289-297. ASME. https://doi.org/10.1115/ICEF2002-509
Download citation file: