针栓式喷注器雾化特性试验

采用高速摄影和马尔文测粒系统对针栓式喷注器雾化特性进行研究，得到了索太尔平均直径（SMD）、粒径分布均匀度指数和雾化锥角随针栓式喷注器结构参数的变化趋势。结果表明:SMD沿喷注轴向均匀不变，沿径向增加；随着气液流量比的增大SMD减小，而粒径分布均匀度指数先降低而后有所回升；粒径分布均匀度指数与狭缝宽度的乘积近似为常值0.35；当气液流量比大于0.206时，由于气动力的作用，雾化边界可分为两段，上面段为收缩段，下面段为等直径段；在针栓式喷注器设计时，狭缝宽度取值越小越好，而液膜半锥角应当考虑SMD和雾化锥角折中选取。 

Experiment on atomization characteristics of pintle injectors

To study the atomization characteristics of pintle injectors, the influences of structural parameters of pintle injectors on Sauter mean diameter (SMD), drop distribution homogeneity factors and atomization cone angles were obtained by using high-speed photography and Marvin measuring instrument. The results indicated that SMD kept constant along the injection axis direction, and increased along the radical direction. In addition, with the increase of gas-liquid mass flow ratio SMD decreased, but the drop distribution homogeneity factors reduced firstly and then increased. The product of drop distribution homogeneity factors and slit width kept constant, which was 0.35. When the gas-liquid mass flow ratio was larger than 0.206, with the effects of aerodynamic force, the atomization boundary could be divided into two zones, the upper zone as the contraction stage, and the lower zone as the equal-diameter stage. Moreover, when designing pintle injectors, the slit width should be chosen as small as possible, while the half cone angle of liquid film should be selected according to SMD and atomization cone angles.