摘要
通过数值模拟方法研究了雾化锥角对蒸发的喷雾液滴群在横流气体中掺混特性的影响,寻求强化掺混和提高温降效果的雾化锥角。提出了评价掺混水平的方法,在与实验吻合的基础上,获得了40°、60°、80°、90°和100°雾化锥角下气相温度的概率分布函数规律、流场结构和两相掺混度曲线。结果表明,随雾化锥角增大,温降效果提高,而掺混度先增大,雾化锥角90°时达到最大值,继续增大雾化锥角,掺混度降低;小雾化锥角时产生对称多涡对结构,在一定区域内促进掺混,而较大雾化锥角时产生混乱的多尺度涡结构,有利于整个掺混截面的温度均匀分布;综合考虑掺混度和温降效果,90°～100°为优化喷雾雾化角。
The influences of spray angle on the mixing of evaporating spray droplets in the crossflow were investigated via a nu- merical simulation to obtain the optimum spray angle that leads to an enhanced mixing and an improved cooling effect. An evalua- tion criterion for mixing effect and degree of mixedness,was proposed. Based on the well validation with the experiment, the distri- butions of crossflow temperature, flowfield structures and curve of mixing degree under five spray angles of 40°, 60°, 80° , 90° and 100° were numerically obtained. The results show that the cooling effect increases with the increase of spray angle,while the mixing degree reaches the maximum when the spray angle is 90° and then decreases with the continuous increase of spray angle. The sym- metrical vortex pairs under the small spray angle contribute to the mixing in certain regions. However, an improved mixing uniformi- ty can be achieved with a larger spray angle attributed to the multi-scale vortex pairs. The spray angle within the range between 90° and 100° is preferred in terms of both the mixing degree and the cooling effect.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2013年第1期50-55,共6页
Journal of Solid Rocket Technology
基金
国家自然科学基金创新群体(50821064)
关键词
喷雾
横流
掺混
蒸发
雾化锥角
spray
crossflow
mixing
evaporation
spray angle
