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液滴撞击倾斜表面铺展研究

鲁杰 李亚磊 徐龙 郝继光

鲁杰,李亚磊,徐龙,等. 液滴撞击倾斜表面铺展研究[J]. 实验流体力学,2022,36(X):1-9 doi: 10.11729/syltlx20220012
引用本文: 鲁杰,李亚磊,徐龙,等. 液滴撞击倾斜表面铺展研究[J]. 实验流体力学,2022,36(X):1-9 doi: 10.11729/syltlx20220012
LU J,LI Y L,XU L,et al. Droplet spreading on an oblique surface[J]. Journal of Experiments in Fluid Mechanics, 2022,36(X):1-9. doi: 10.11729/syltlx20220012
Citation: LU J,LI Y L,XU L,et al. Droplet spreading on an oblique surface[J]. Journal of Experiments in Fluid Mechanics, 2022,36(X):1-9. doi: 10.11729/syltlx20220012

液滴撞击倾斜表面铺展研究

doi: 10.11729/syltlx20220012
基金项目: 国家自然科学基金(12072032);国家重点研发计划(2018YFF0300804)
详细信息
    作者简介:

    鲁杰:(1995—),男,汉族,贵州贵阳人,助理工程师。研究方向:流体机械设备设计技术。通信地址:北京市海淀区丰贤东路1号中国船舶工业系统工程研究院航空保障研究所(100094)。E-mail:luj_bit@163.com

    通讯作者:

    E-mail:hjgizq@bit.edu.cn

  • 中图分类号: O352

Droplet spreading on an oblique surface

  • 摘要: 液滴碰撞固体表面后铺展的现象广泛存在于航空航天和工农业应用中。在工程中,被撞击表面多不与液滴速度方向垂直,而前人对于液滴碰撞铺展的研究多基于垂直碰撞,其研究成果无法直接解决工程斜碰撞问题。通过实验研究液滴碰撞倾斜固体表面铺展形成液膜的演化过程,获得了不同表面倾斜角度和不同韦伯数条件下液膜形状的瞬态数据;基于新建立的液滴碰撞倾斜表面铺展理论,分析了液膜形状的瞬态变化过程,发现该理论可以合理预测小倾角下液滴的铺展,而对于大倾角下液膜在倾斜方向最大铺展宽度的预测,由于推导过程中将液膜上沿长度近似为常数,导致误差较大;为解决该问题,通过加入液膜上边沿长度的细致理论分析,建立了一个预测液膜最大形状的解析模型,预测结果相对实验结果的误差可从前人理论的61.8%降至3.2%。本研究提升了大倾角情况下液滴铺展预测的准确性,为工程应用提供了一个简洁准确的理论工具。
  • 图  1  实验装置示意图

    Figure  1.  Sketch of the experimental setup

    图  2  铺展过程参数示意图

    Figure  2.  Sketch of the spreading parameters

    图  3  液滴斜碰撞铺展过程(We=37.6)

    Figure  3.  Spreading process of droplets impacting on inclined substrates (We=37.6)

    图  4  水平方向最大铺展宽度与倾斜角度的关系

    Figure  4.  The variation of the maximum horizontal width as a function of the inclination angle

    图  5  倾斜方向最大铺展宽度与倾斜角度的关系

    Figure  5.  The variation of the maximum oblique width as a function of the inclination angle

    图  6  小倾角下液滴演化的实验与模型预测结果(We=37.6)

    注:图(a)中t=1时的黄线区域为液滴拉伸形成的影像,不是液膜

    Figure  6.  Droplet evolution at small inclination angles from experiments and model prediction (We=37.6)

    图  7  大倾角下液滴演化的实验与模型预测结果(We=37.6)

    Figure  7.  Droplet evolution at large inclination angles from experiments and model prediction (We=37.6)

    图  8  液膜形状尺寸以及位置参数

    Figure  8.  Parameters of the lamella shape and location

    图  9  椭圆中心与碰撞点距离随表面倾斜角度的变化(We=37.6)

    Figure  9.  Distance between the ellipse center and the impact point as a function of the inclination angle (We=37.6)

    图  10  实验与解析模型预测结果(We=37.6)

    Figure  10.  Droplet evolution by experiments and analytical model predictions (We=37.6)

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出版历程
  • 收稿日期:  2022-02-15
  • 修回日期:  2022-04-08
  • 录用日期:  2022-04-27
  • 网络出版日期:  2022-11-15

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