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为了改善双旋流杯点火性能,需要优化其下游的流场和油雾场。利用激光粒子动态分析技术(PDA)测量基准双旋流杯下游的流场和油雾场,据此提出一级旋流器旋流数仅增大6.7%,但切向动量矩减小44%的改进方案,并进行了流场和油雾场对比试验。试验结果表明:减小双旋流杯一级旋流切向动量矩会使旋流杯下游流场结构发生较大变化,使其从收扩型转变为扩张型,同时减小油雾的索太尔平均直径(SMD);当与旋流杯出口距离超过2.5倍文氏管喉道直径时,流场输运和油滴蒸发作用增强,使得油雾分布更加均匀,燃油SMD更小。在航空发动机燃烧室双旋流杯设计中,不仅要考虑传统的旋流数概念,还应考虑各级切向动量矩的综合影响作用。
In order to improve the ignition performance of the double swirl cup, it is necessary to optimize its downstream flow field and oil mist field. The laser particle dynamic analysis (PDA) is used to measure the flow field and oil mist field downstream of the reference double swirl cup. It is proposed that the swirl number of primary swirler increases by only 6.7%, but the tangential momentum moment decreases by 44% Improvement program, and the flow field and oil mist field comparative test. The experimental results show that reducing the first-order tangential momentum moment of the double-swirl cup causes the structure of the flow field downstream of the swirl cup to change greatly, which makes it change from the receiving and expanding to the expanding and the oil mist reducing Tyrolean Mean Diameter (SMD). When the outlet of the swirl cup exceeds 2.5 times the venturi throat diameter, the transport of the flow field and the evaporation of the droplet are enhanced, resulting in more uniform oil mist distribution and smaller fuel SMD. In aero-engine combustor double swirl cup design, not only the traditional concept of swirl number should be considered, but also the comprehensive influence of tangential momentum moment should be considered.