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本文着重研究了喷孔入口处圆角与喷油嘴流量系数的关系。当无因次R大于0.3后,流量系数为恒定,喷孔入口处有圆角比无圆角,其流量约增加20％。由于该喷油嘴的喷油持续期和雾化特性,在柴油机较宽的负荷范围内部百较好的匹配,发动机性能有明显提高,尤其在燃油消耗和排气烟度方面有显著改进,从燃油系统和燃烧分析可认为,其主要原因是消除了后燃。由于该喷油嘴克服了喷孔孔径随使用时间增加而扩大的弊病,从而可提高喷油嘴的使用寿命。
This paper focuses on the relationship between the fillet entrance and nozzle flow coefficient. When the dimensionless R is greater than 0.3, the flow coefficient is constant. There is a round corner at the entrance to the orifice, and the flow rate increases by about 20%. Due to the injection duration and atomization characteristics of the injector, engine performance is significantly improved over a wide load range of the diesel engine, with significant improvements in fuel consumption and exhaust smoke, especially from Fuel system and combustion analysis can be considered, the main reason is the elimination of afterburning. As the nozzle to overcome the spray hole diameter increases with the use of time to expand the shortcomings, which can improve the nozzle life.