Droplet Size and Velocity Analysis of a Diesel Spray Using Improved ILIDS Method 18ICES/070
Authors
Chang-seong Ryu - Chiba University
Yasuo Moriyoshi - Chiba University
Masato Yamada - Chiba University
Ryo Uchida - Chiba University
Myung-whan Bae - Gyeongsang National University
Abstract
The characteristics of Diesel spray, such as droplet size, velocity and droplet size distribution were simultaneously measured by using an improved ILIDS method. Experiments were performed with an accumulator type unit injector system and a constant-volume high-pressure vessel. The injection pressure and ambient gas pressure were changed from 60 MPa to 100 MPa and up to 1 MPa, respectively. A single hole nozzle with orifice diameter of 0.244 mm was used. The measurement region was chosen at 40-60 mm from the nozzle-tip. Two dimensional cross-section tomograms of sprays were also taken with a double-pulsed Nd-YAG laser and CCD camera. As a result, curve-fittings of Nukiyama-Tanasawas droplet size distribution function were carried out. Under the atmospheric pressure, Value of became small with going downstream. Meanwhile, under the pressurized condition, the value and droplet distribution was almost same. Furthermore, SMD decreased with going downstream in case of ambient pressure of 0.1 MPa. However, under the pressurized condition, the tendency was reverse.