摘要
利用FIRE混合多相流模型,模拟了柴油机缝隙式喷油嘴高压喷射时嘴内的空穴流动现象,分析了空穴在喷油嘴内分布情况。基于这一模型进一步分析了喷射压力和喷孔长宽比等参数对喷孔内空穴分布的影响。通过模拟计算可知,提高缝隙式喷嘴喷射压力可以提高空穴强度,其完全空穴主要由上壁面空穴流产生,同时也发现较圆孔式喷嘴其空穴流强度更大,但空穴在喷孔出口截面上不及圆孔式分布均匀。从燃油空穴雾化理论的角度出发,空穴强度的提高有利于燃油的破碎雾化。
The cavitation flow in a gapping noozle at high pressure spray of a diesel engine was simulated,and the distribution of cavitation inside the nozzle was analyzed using multiphase flow model in FIRE.Based on this model, the effects of parameters, such as injection pressure, length-wide ratio, on the distribution of the cavitation inside the nozzle are analyzed. Simulation results show that the all cavitation is mainly obtained at the top face of gapping nozzle and the cavitation in gapping nozzle is more intensive than the round one＇s, but bad in uniform distribution of cavitation at the nozzle exit section. Then better atomization can be realized by enhancing the cavitation intensity via increasing the injection pressure.
出处
《小型内燃机与车辆技术》
2016年第4期44-49,共6页
Small Internal Combustion Engine and Vehicle Technique
