水滴撞击倾斜非Newton除冰液液膜动力学行为特性数值研究
Numerical Study on Dynamic Behavior Characteristics of Water Droplets Hitting Inclined Non-Newtonian Deicing Liquid Films
崔静 1岳茂昌 1牛书鑫 1杨广峰1
作者信息
- 1. 中国民航大学 航空工程学院,天津 300300
- 折叠
摘要
为了探究降雨天气下水滴撞击除冰液液膜后引发的非Newton动力学行为,耦合相界面控制方程及组分输运方程,构建了多相、多组分、多体系耦合作用的液滴撞击非Newton液膜的动力学行为模型.开展了水滴撞击除冰液液膜非稳态演化行为特性数值研究,以实验结果验证并修正了模型.此外,进一步分析了除冰液的剪切稀化特性和斜面坡度对撞击过程的影响机制.研究结果表明:液滴撞击倾斜液膜后会产生非对称的液冠,而除冰液非Newton特性引发的黏度差异进一步导致撞击后的非对称运动;在液冠的形成过程中,除冰液被带离液膜,与水分的稀释效应共同降低了液膜的黏度;坡度的增加限制了水滴在液膜上游的作用范围,促进了下游液冠的生长进而加快了除冰液的脱离,因此液膜在下游的黏度显著降低.
Abstract
To investigate the non-Newtonian dynamic behavior of water droplets hitting deicing fluid films un-der rainy weather conditions,the phase interface control equation was coupled with the component transport e-quation to construct a dynamic behavior model for multi-phase,multi-component and multi-system coupling ac-tions of droplets hitting non-Newtonian liquid films.The non-steady-state evolution characteristics of water droplets hitting deicing fluid films were numerically studied,and the model was validated and modified based on experimental results.Furthermore,the influence mechanisms of shear-thinning characteristics of the deicing fluid and slope gradients on the impact process were further analyzed.The results indicate that,an asymmetric liquid crown will form after a droplet impacts the inclined liquid film.The viscosity disparity resulting from the non-Newtonian characteristics of the deicing liquid further contributes to the asymmetrical motion following the impact.During the formation of the liquid crown,the deicing liquid is taken away from the film,and the dilu-tion effect of water reduces the film viscosity.Increasing the slope restricts the upstream range of water drop-lets,facilitating the growth of the downstream liquid crown and accelerating the deicing of the film.Conse-quently,the viscosity of the downstream liquid film significantly decreases.
关键词
除冰液/剪切稀化/组分输运/坡度Key words
deicing liquid/shear thinning/component transport/slope引用本文复制引用
基金项目
国家自然科学基金面上项目(52076212)
天津市研究生科研创新项目(2022SKYZ359)
出版年
2024
国家科技期刊平台
NSTL
万方数据