- 著者
- Yuyin ZHANG Keiya NISHIDA Takuo YOSHIZAKI
- 出版者
- 社団法人 日本機械学会
- 雑誌
- JSME International Journal Series B Fluids and Thermal Engineering (ISSN:13408054)
- 巻号頁・発行日
- vol.46, no.1, pp.100-108, 2003 (Released:2004-06-25)
- 参考文献数
- 17
- 被引用文献数
- 2 10
Recent experimental studies have shown that with split injection strategy, the soot and NOx emissions from a diesel engine can be reduced significantly in comparison with a conventional non-split injection. To understand the mechanism of emissions reduction, it is essential to clarify the process of mixture formation in the diesel spray. For characterizing the droplets and vapor concentration distributions inside a fuel spray, a dual-wavelength laser absorption-scattering technique (LAS) was developed by using the 2nd harmonic (532nm) and the 4th harmonic (266nm) of an Nd: YAG laser and using dimethylnaphthalene as a test fuel. By applying the ultraviolet-visible LAS imaging technique, the distributions of droplets and vapor concentrations in the spray, which was injected into a high-temperature and high-pressure nitrogen ambient in a constant volume vessel by a common-rail diesel injection system, were measured and quantitatively analyzed. The effect of injection mass ratio of double-pulse injections on distributions of equivalence ratios of vapor and droplets in the sprays was examined.