Air-Entrainment in Wall-Jets Using SLIPI in a Heavy-Duty Diesel Engine

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Abstract

Mixing in wall-jets was investigated in an optical heavy-duty diesel engine with several injector configurations and injection pressures. Laser-induced fluorescence (LIF) was employed in non-reacting conditions in order to quantitatively measure local equivalence ratios in colliding wall-jets. A novel laser diagnostic technique, Structured Laser Illumination Planar Imaging (SLIPI), was successfully implemented in an optical engine and permits to differentiate LIF signal from multiply scattered light. It was used to quantitatively measure local equivalence ratio in colliding wall-jets under non-reacting conditions. Mixing phenomena in wall-jets were analyzed by comparing the equivalence ratio in the free part of the jet with that in the recirculation zone where two wall-jets collide. These results were then compared to φ predictions for free-jets. It was found that under the conditions tested, increased injection pressure did not increase mixing in the wall-jets. Comparisons with free-jet predictions further indicated that mixing in wall-jets is less effective than in free-jets for identical conditions and downstream distances. The confined nature of the wall-jet in the optical engine is suspected to be the reason for these observations. A rapid leaning-out of the jet after end of injection was observed for all cases, but this enhanced mixing was not transmitted to the wall-jet.

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Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Energiteknik
Originalspråkengelska
Artikelnummer2012-01-1718
Sidor (från-till)1684-1692
Antal sidor9
TidskriftSAE International Journal of Engines
Volym5
Utgåva nummer4
StatusPublished - 2012 sep 10
PublikationskategoriForskning
Peer review utfördJa
EvenemangSAE 2012 International Powertrains, Fuels & Lubricants Meeting - Malmo, Sverige
Varaktighet: 2012 sep 182012 sep 20