液滴发生器均匀液滴生成过程的动态特性

为了提高液滴发生器生成均匀液滴的稳定性，研究了液滴生成过程的动态特性。在传统射流表面波不稳定性理论的基础上，考虑液滴发生器动态特性的影响，建立了组合动力学模型，确定了传递函数与传递矩阵，并就Re数与We数等对射流表面波增长率的影响以及喷嘴长径比对液滴生成过程动态特性的影响规律进行了分析。采用丙二醇作为液体工质进行了计算与试验校验，结果表明当生成的液滴速度大于19m/s时，组合动力学模型计算得到的最优无量纲波数较射流表面波不稳定性模型结果偏差超过6%；而对于液滴速度30m/s设计工况，两种模型计算结果偏差近10%，此时液滴发生器动态特性的影响不能忽略。

Dynamic Characteristics of Mono Dispersed Droplets Generation Process by Droplet Generator

To improve the stability of mono-dispersed droplets generated by droplet generator, the dynamic characteristics of droplet generation process are studied. Considering the dynamic characteristics of droplet generator, the combined dynamics model is set up based on the conventional capillary instability theory. The transfer functions and the transfer matrices are deduced. The influence of parameters such as Re number and We number on the growth rate of fluid disturbance are analyzed. The effect of injector length/diameter ratio on the dynamic characteristics of droplet generation process is also discussed. Propanediol used as working fluid is calculated and verified experimentally. The results show that the optimum non-dimensional wave number offsets over 6% for the generated velocity of droplets exceeding 19m/s, when the dynamic characteristics of droplet generator are considered in the model. And the optimum non-dimensional wave number offsets almost 10% at the rated condition with 30m/s, so the dynamic characteristics of droplet generator cannot be ignored in this case.