旋流杯套筒混合段长度对点火特性的影响

为研究旋流杯套筒过长的混合段长度对燃烧室点火特性的影响，设计了两种不同的套筒混合段长度试验件，在常温常压条件下，采用单头部模型燃烧室进行了起动点火性能试验，同时采用马尔文进行了燃油雾化颗粒度测量，并结合Fluent软件的数值模拟对结果进行分析.研究结果表明:套筒混合段长度对燃烧室头部流场和油雾分布有很大影响，过长的套筒混合段长度将造成液雾与套筒壁碰撞，限制旋转射流和液滴的径向运动，造成喷雾锥角减小了32%，贫油起动点火油气比增加了20%左右. 

Effects of sleeve mixing length of swirl cup on the ignition characteristics

A research was performed done to study the effect on the ignition performance by the too long mixing length of sleeve. Two variations of sleeve mixing length were made to test the ignition performance using a single module test combustor under normal temperature and atmospheric pressure. Melvin was used to test the spray particle size, and the software Fluent was used to analyze the experimental results. The research results show:the hardware geometry of sleeve mixing length has a great influence on the flow fields, and spray distributions of the dome. The spray drops will impact on the wall of sleeve when the mixing length of sleeve is long enough, and the radial movement of swirl jets and spray drops will be confined, leading to the decrease of spray cone angle by 32% and the increase of fuel air ratio(FAR) of lean ignition about 20%.