A study of the mixture formation process of a diesel spray under phase change |
| |
Authors: | Jeongkuk Yeom Jongsang Park Sipom Kim Jongyul Ha Sungsik Chung Joongsoon Lee |
| |
Affiliation: | 1.Division of Mechanical Engineering,Dong-A University,Busan,Korea;2.Department of Automobile Engineering,Tongmyong University,Busan,Korea |
| |
Abstract: | The purpose of this study was to analyze the structure and to clarify the mixture formation process within evaporative diesel
spray. Liquid fuel was injected from a single-hole nozzle (l/d=1.0mm/0.2mm) into a constant-volume vessel under high pressure
and temperature in order to visualize the spray phenomena. An exciplex fluorescence method was applied to the evaporative
fuel spray to measure and investigate both the liquid and the vapor phase of the injected spray. The region of interest in
this experiment was downstream towards the end of the spray. For accurate investigation, images of the liquid and vapor phase
regions were recorded with a 35mm still camera and CCD camera, respectively. For the case of the evaporative fuel spray, the
images showed that within the region of liquid phase very small droplets could be found outside of the spray and larger droplets
at the spray’s tip. This can be explained through the droplet classification defined byStokes number (stk) (Chung et al., 1990). From the 2-dimensional analysis results of the heterogeneous distribution of the inner spray, a 3-dimensional
analysis was attempted by using the offset incidence of the laser beam from the spray’s center axis. Finally, in order to
quantify the mixture’s state change within the vapor phase region of the injected spray, images analysis were carried out
based on the entropy of statistical thermodynamics. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|