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Technical Paper

Diesel Spray Impingement Behavior and Adhering Fuel on a Recessed Wall

2003-05-19
2003-01-1834
Characteristics of fuel adhering after wall impingement of diesel spray were investigated experimentally. A flat wall, a recessed-wall which has a conical opening at impingement point, and a rugged-wall which has many concentric circular grooves, were used as an impingement wall. Diesel spray was impinged vertically to the wall in a high pressure chamber under a cold state. The spray behavior impinged on each of the three types walls was observed using a drum camera, which allowed high speed photographs. The spray after impingement on the recessed-wall was reflected from the wall with rolling-up motion, while the spray impinging on the flat wall was expanded along the wall surface to the radial direction. So, the recessed-wall might be expected to control the spray attitude in real engines. The spray height on the recessed-wall was higher than that on a flat wall. The amount of fuel stuck on each wall was measured by a precision balance.
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