(3-21) A Study of Soot Cloud Structure In High Pressure Single Hole Common Rail Diesel Injection Using Multi-Layered Laser-Induced Incandescence((D-3)Diagnostics 3-Applications and Advamced Technolog)
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Soot cloud structure is studied using Laser Induced Incandescence. A single hole Common Rail Diesel injector is used to enable high injection pressures up to 150MPa. The spray is observed in a high pressure, high temperature cell that reproduces the conditions existing in a combustion chamber of a Diesel engine during injection. LII is used to visualize soot volume fraction and is combined with a multi-layered technique in order to quantify LII signal attenuation by soot lying between the incandescent layer and the camera. Several laser sheet and camera positions are used, including vertical and horizontal sheets with respect to the vertical axis of the spray. Results analysis shows that strong LII signal attenuation occurs in the spray because of very high soot density, preventing any quantitative analysis of soot volume fraction. However, the multi-layered procedure enables a detailed estimation of the attenuation that leads to a qualitative characterization of the soot cloud structure. A database of soot visualizations is built with varying injection parameters. It is found that the first soot particles appear at the periphery of the vapor cloud. Later during injection, a high soot density area is formed at the tip of the spray, the maximum concentration being in the center of the cloud. The very tip of the soot cloud exhibits a very abrupt decay of soot volume fraction while the lateral sides show more progressive gradients. Finally, the effect of injection pressure, ambient temperature and dilution are discussed, and their effect on global soot density during injection is compared. Pressure, temperature and dilution effects do not change the global structure of the soot cloud, but they have an influence on the timing of appearance and on the global location of the soot cloud.
- 2001-07-01
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関連論文
- (3-21) A Study of Soot Cloud Structure In High Pressure Single Hole Common Rail Diesel Injection Using Multi-Layered Laser-Induced Incandescence((D-3)Diagnostics 3-Applications and Advamced Technolog)
- MD3-1: Study of the Effect of Wall Guiding on Direct Diesel Injection by Optical Diagnostics(MD: Measurement and Diagnostics,General Session Papers)