中文摘要：

为了研究阀芯结构对双流体喷雾粒子特性的影响,提升喷雾效果,运用相位多普勒粒子分析仪（PDPA）对不同阀芯结构的双流体喷雾雾滴粒径、轴向速度以及雾滴数目进行了测试,并对测量结果进行了分析和讨论。结果表明：随着轴向距离的增大,雾滴索特平均直径（SMD）、算术平均直径（AMD）呈先增大后趋于平缓的趋势,轴向速度以及湍流脉动速度均呈减小趋势,雾滴数目呈先增大后减小的趋势;随着气液压力比的增大,SMD呈先增大后减小的趋势,而AMD、轴向速度以及雾滴数目均呈减小趋势;阀芯的喉口直径、出口直径的减小均有利于喷雾效果的提升,但同时导致速度稳定性变差;当喉口直径为1.5mm、出口直径为2.5mm时,与原始阀芯结构相比,雾滴数目和雾滴轴向速度分别增大了82.43%和22.31%,SMD和AMD分别减小了52.18%和21.47%,综合喷雾效果得到了大幅提升。

英文摘要：

In order to study the effects of spool structure on droplet characteristics of two-fluid spray and improve the spray effects,the droplet diameters,droplet axial velocities and droplet numbers of two-fluid spray under different spool structures were measured with phase Doppler particle analyzer（PDPA）.According to the test results,the droplet characteristics were analyzed and discussed systematically.The test results indicate that spool structures have a great influence on droplet characteristics.With the axial distance increase,the Sauter mean diameter（SMD）and the arithmetic mean diameter（AMD）of droplet increase first and then remain constant,the droplet axial velocity and turbulent fluctuation velocity decrease,the droplet numbers increase first and then decrease.With the air？water pressure ratio increase,SMD increases first and then decreases,but AMD,droplet axial velocity and droplet numbers decrease.Moreover,the decrease of throat diameter and outlet diameter of spool structure are benefit for improving the spray effectiveness,but it is disadvantage to the stability of speed.It has a good spray effectiveness when the throat diametera is as 1.5mm and the spool outlet diameter is as 2.5mm.Compared with the original spool structure,the droplet numbers and droplet axial velocity increase by 82.43% and 22.31%,the SMD and AMD decrease by 52.18% and 21.47%respectively,the comprehensive spray effectiveness has a great improvement.