Characteristics of a Diesel Spray Impinging on a Flat Wall (2nd report)

Abstract

In the experiments presented here, diesel fuel oil was injected into a high pressure chamber in which compressed air or CO2 gas at room temperature was charged. A single spray was impinged on a flat wall at a normal angle. The growth of the spray was photographed, not only with transmitted light but also with scattered light through a narrow slit. The temporal and spatial distribution of the droplets density in the impinging spray applying the concentric circle model was calculated using data collected by the laser light extinction method. From these results, detailed information concerning the droplets density in the impinging diesel spray was obtained. The effects of ambient density, distance from the wall to the nozzle, and injection pressure on the impinging spray were revealed. Finally, experimental equations for the radius and the height of the impinging spray were obtained. © 1990, The Japan Society of Mechanical Engineers. All rights reserved.