变形破碎特性对SLD结冰过程影响

基于结冰过程数值模拟,针对过冷大水滴（SLD）条件下的变形破碎特性及其对成冰过程影响进行了研究。利用动态阻力计算模型,分析了水滴变形对水滴运动轨迹影响,采用基于泰勒类比理论的计算模型,研究了水滴破碎过程、子液滴粒径分布特性等。完成了NACA 0012翼型典型SLD结冰算例的数值分析,与参考文献计算结果和实验数据进行对比。结果表明:对于SLD结冰,变形和破碎主要改变了水滴运动轨迹和表面撞击水分布,使水滴撞击极限变小,在加入变形破碎特性的计算模型后,可以较好预测结冰极限位置和冰形轮廓,说明该方法对SLD变形破碎效应及其影响的模拟是可行和正确的。 

Effect of deformation and breakup characteristic on supercooled large droplet icing process

To reveal and master the effects of the droplets deformation and breakup under supercooled large droplet (SLD) conditions, a numerical solver was developed to simulate the ice accretion. The ice accretion on the NACA 0012 airfoil was predicted. For the SLD movement, the droplet deformation and breakup process was investigated using a dynamically varying drag model and Taylor analogy method. Using the above methods, the numerical simulation of ice accretion and icing effects at the deformation and breakup of SLD was performed. These numerical results were compared with the computational and experimental data in several past literatures. The results are in good agreement with experimental data, indicating that the models and methods are feasible and effective. And the comparative results show that accounting of deformation and breakup has made significant improvement to the simulation of the droplet trajectory and ice shape distribution for the SLD icing prediction.