摘要
改造普通油嘴 ,采用单次高压燃油喷射系统和阴影照相 ,首次研究了柴油射流柱在亚、超声速气流中横向非定常喷射问题。忽略破碎和雾化过程 ,用双流体模型和高精度格式 ,对该问题进行了初步的数值模拟。结果表明 :沿射流柱表面传播的表面波是引起射流柱破碎的主要因素 ,破碎点位于表面波的波谷。高速气流中射流柱的雾化过程可分为射流柱区、大液块的首次破碎区、小液块的二次破碎区和液滴区。射流激波贴近射流柱迎风面 ,为三维凸形结构 ,在通道内反射 ,形成非定常的复杂波系结构。射流、来流动压比是影响柴油穿透深度的关键参数。
WT5”BZ]The shadowgraph and a single pulsed fuel injection system were used to study diesel transversely injected into a subsonic and supersonic flow.Irrespective of the spray breakup and atomization,the two fluid model and high order schemes were used to simulate this phenomenon.The results indicate that the disintegration of the jet column is caused by the surface waves propagating along the jet body.The jet breaks up at the wave trough.The four regimes,i.e.jet column,primary breakup region,secondary breakup region and droplets zone,appear clearly.The jet shock is three dimensional and close to the windward surface of the jet body.The shock wave reflects in the duct and changes its structure with time.The aerodynamic pressure ratio is the key parameter that affects the jet penetration height.The numerical distribution of diesel agrees qualitatively with the experimental result. [WT5”HZ]
出处
《燃烧科学与技术》
EI
CAS
CSCD
2000年第2期101-106,共6页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目! (1 9882 0 0 5)
中国科学院重点课题资助项目
关键词
柴油喷射
雾化
风洞
超声速流
实验
fuel injection
atomization
wind tunnel
supersonic flow
supersonic combustion
