双级轴向旋流杯气量比对雾化性能影响的试验

为探索小状态下改善雾化性能的途径,从调节旋流杯气量分配的角度出发,对不同一、二级气量比的双级轴向旋流杯开展了试验研究,获得了气量比对液滴平均直径、液滴尺寸分布指数以及喷雾锥角的影响规律。试验结果表明:气量比的增大不仅降低液滴平均直径,而且使得旋流杯在较宽的供油压差范围内都具有良好的雾化品质,可实现小状态下雾化性能的改善。旋流杯喷雾锥角随气量比的增大而增大,随供油压差的增大而增大并逐渐趋于稳定。旋流杯总气量恒定时,气量比接近1时的综合雾化性能最佳。 

Experiment on effects of airflow ratio on spray characteristics of dual-axial swirl cup

In order to explore a way to improve the spray performance under low injection pressure differential, from the perspective of regulating airflow split, effects of airflow ratio of primary swirler to secondary swirler on the spray characteristics of dual-axial swirl cup were studied by experimental system. The influences of airflow ratio on mean drop diameter, drop size distribution parameter and spray angle were obtained. The experimental results indicated that increasing the airflow ratio, the mean drop diameter decreased, and the swirl cup had good spray property over a wide range of injection pressure differential, which could achieve the improvement of the spray performance under low injection pressure differential. The spray angle increased with the airflow ratio, and firstly increased but then remained constant with the injection pressure differential. For a given total airflow of swirl cup, the optimal comprehensive spray performance was obtained when the airflow ratio was about 1.