Abstract
The droplet characteristics of unsteady fuel spray formed by multi-hole injector used in direct injection gasoline engine was investigated. In order to understand the detail structure of transient spray, a phase Doppler anemometer was used. The traverse system of the vessel was designed to obtain two-dimensional structure of spray. The laser power at measurement volume was optimized in order to detect relative smaller droplets. It is necessary to evaluate the effect of laser power of measurement volume on detection limit of smaller droplets under 10 μm. Phase locking method was used to analyze ensemble mean value of axial/radial droplet velocity, axial/radial slip velocity, relative droplet Reynolds number, and droplet turbulent kinetic energy. As a result, smaller droplets under 10 μm can follow the entrainment vortex at the spray shell. On the other hand, larger droplets over 30 μm have larger velocity to penetrate the entrainment vortex. Intermediate droplets of 15<D≦ 20μm in diameter are criteria for follow/penetration of vortex.
| Original language | English |
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| Publication status | Published - Dec 1 2006 |
| Event | 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 - Kyoto, Japan Duration: Aug 27 2006 → Sept 1 2006 |
Other
| Other | 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 |
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| Country/Territory | Japan |
| City | Kyoto |
| Period | 8/27/06 → 9/1/06 |
Keywords
- Entrainment structure
- Multi-hole injector
- Size-classified droplet behavior
- Turbulent kinetic energy
ASJC Scopus subject areas
- Surfaces, Coatings and Films