乳化燃料使用ディーゼル機関の性能に及ぼす燃料噴射方向の影響

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This paper presents the influence of injection direction on the performance of a diesel engine driven by water-in-gas oil emulsified fuel. The experiments were conducted on a small direct injection diesel engine equipped with a bowl in the piston, and the directions of fuel injection were changed from the bowl center (ψ=0°: normal condition) to the side wall of the combustion chamber (ψ= 50°), using a single hole nozzle with nozzle diameter of 0.6mm. It was found that when water-in-gas oil emulsified fuel was used, the specific fuel consumption increased significantly compared with gas oil operation as the injection direction changed toward the side wall of the chamber, especially at ψ=50°, whereas the NOx concentration and smoke density were remarkably reduced. The reason may be considered that the degree of constant volume of combustion ηglh and the cooling loss φw deteriorate respectively.
社団法人日本マリンエンジニアリング学会の論文