The study on vapor-liquid phases of diesel spray-impingement under different wall temperatures by LIEF (Laser indueced exciplex fluorescence)

Paper #:
  • 2018-01-0295

Published:
  • 2018-04-03
Abstract:
The effects of different wall-temperatures on spray-impingement have been investigated in a high-temperature high-pressure constant volume combustion vessel in this paper. A cooling equipment was used to control the wall temperature and to adjust the temperature difference between the wall and the ambient. Laser induced exciplex fluorescence (LIEF) technique was used to probe the vapor and liquid phases of injected fuel. The dodecane was chosen as the diesel surrogate to study the spray process to avoid the interference of diesel fuel on fluorescence. The spray-impingement process was tested by changing the ambient temperatures (Ta)、ambient pressures (Pa)、injection pressures (Pi) and wall temperatures (Tw). The results show that the wall temperature mainly affect the equivalence ratio in the vapor phase of injected fuel, With the wall temperature decrease, it can be found that the higher concentration regions (equivalence ratio >1) enlarged along the wall surface and the total area of vapor phase decrease under the situation of high temperature and high pressure (Ta=773K, Pa=4Mpa). With the increase of injection pressure (600~1600 bar), the effect by the different wall temperature decrease and disappeared at the injection pressures Pi=1600 bar. For the liquid phase of injected fuel, wall temperature have little influence of the concentration. The liquid spray have not touched the wall at the distance L=35 mm (between wall and injector), also it cannot be observed the wall wetting at all wall temperature(343~773K) and injection pressure (600~1600 bar). At the condition of Ta=573K, Pa=4Mpa, lower ambient temperature make the total evaporation of fuel decreased so that it hardly to distinguish the influence of wall temperature. But for the liquid phase, the wet wall phenomenon can be detected and increase with the wall temperature decreased. In general, lower wall temperature reduce the mixture of fuel and ambient gas, but it effect different objects at different ambient condition.
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