Ignition characteristics of a diesel spray impinging on a wall

Abstract

Ignition and combustion characteristics of diesel spray impinging on a flat wall were experimentally investigated. Ignition position and appearance position of the luminous flame kernel were stereoscopically observed using a two-way fiber optical system. Distance from nozzle tip to impingement point on the wall was set at 50mm and ambient temperature was varied from 653K to 793K. Effect of ambient temperature on ignition position was investigated. As the result, ignition positions were observed near the spray periphery. However, the luminous flame appeared near the impingement wall because the fuel rich region was formed near the wall.