年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
DIESEL SPRAY IMPINGING ON A FLAT WALL, PART I: CHARACTERISTICS OF ADHERED FUEL FILM IN AN IMPINGEMENT DIESEL SPRAY
要約
The relationship between the behavior of a spray impinging on a vertical flat wall and the fuel mass adhered on the wall was investigated experimentally. Behavior of diesel fuel spray injected into a high-pressure chamber of cold state was observed by a drum camera. An aluminum circular plate was put on the impingement wall to catch the adhered fuel, and the transparent wall was inserted into the pressure chamber to permit photographing the adhered fuel film. The adhered fuel mass was analyzed by dividing the mass into two types, the fuel film itself and the sparsely adhered fuel encircling with the film. As a result, the splash occurring with breakup of the fuel film leads to a reduction of the adhering fuel mass on the wall. The adhered fuel ratio increased remarkably with an increase of the wall distance. In cases of wall distances of 30, 50, and 70 mm, the adhered fuel ratios were more than 40%. The fuel film thickness was estimated at 10−30 μm. As the wall distance became .shorter, the film thickness became thinner, while the sparsely adhering fuel in the vicinity of the film increased.
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