Ignition position of wall impingement diesel spray

Abstract

Ignition and combustion characteristics of diesel spray impinging on a wall were investigated. Delay time of firstly observed luminous flame and its appearance position were measured. Distance from nozzle tip to impingement wall were fixed at 50mm and ambient temperature was varied from 400 to 500℃. As the result, when the delay time became short (<3ms), the luminous flame appeared around the axis of fuel jet. On the other hand, when the delay time became long (>3ms), the luminous flame appeared near the impingement wall. The result showed that the luminous sooty flame was generated inside the spray with high fuel concentration.