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气液针栓式喷注器液膜破碎过程和结构的数值研究

林伟 郑水华 柴敏 孙泽楠 金台

林伟, 郑水华, 柴敏, 等. 气液针栓式喷注器液膜破碎过程和结构的数值研究[J]. 航空动力学报, 2023, 38(3):618-629 doi: 10.13224/j.cnki.jasp.20210514
引用本文: 林伟, 郑水华, 柴敏, 等. 气液针栓式喷注器液膜破碎过程和结构的数值研究[J]. 航空动力学报, 2023, 38(3):618-629 doi: 10.13224/j.cnki.jasp.20210514
LIN Wei, ZHENG Shuihua, CHAI Min, et al. Numerical simulation of liquid sheet breakup process and structures in gas-liquid pintle injector[J]. Journal of Aerospace Power, 2023, 38(3):618-629 doi: 10.13224/j.cnki.jasp.20210514
Citation: LIN Wei, ZHENG Shuihua, CHAI Min, et al. Numerical simulation of liquid sheet breakup process and structures in gas-liquid pintle injector[J]. Journal of Aerospace Power, 2023, 38(3):618-629 doi: 10.13224/j.cnki.jasp.20210514

气液针栓式喷注器液膜破碎过程和结构的数值研究

doi: 10.13224/j.cnki.jasp.20210514
基金项目: 国家自然科学基金(51976193); 浙江省自然科学基金(LY21E060009);能源清洁利用国家重点实验室开放基金(ZJU-CEU2020004); 浙江省基础公益计划项目(LGG22E060011)
详细信息
    作者简介:

    林伟(1996-),男,硕士生,主要从事针栓式喷注器雾化机理研究

    通讯作者:

    金台(1988-),男,副教授,博士,主要从事多相湍流流动与燃烧研究。E-mail:jintai@zju.edu.cn

  • 中图分类号: V434.3

Numerical simulation of liquid sheet breakup process and structures in gas-liquid pintle injector

  • 摘要:

    为了更好地认识针栓式喷注器雾化场的结构,基于网格自适应加密技术以及VOF (volume of fraction)方法追踪气液的分界面,采用realizable k-ε湍流模型模拟整个流动过程,还原了不同时刻气/液撞击的初次破碎过程,数值模拟结果与高速摄影试验结果定性定量对比均吻合较好,验证了数值方法的准确性。进一步对针栓式喷注器气/液撞击的初次破碎过程、内部流场涡结构、速度场进行分析,研究了初次破碎雾化的动力学过程和机理。研究结果表明:液桥的形成主要是由液洞的扩展和拉伸、合并而形成,而液滴主要是由中心液膜拉伸、液丝断裂以及液桥断裂而形成,液膜破碎阶段形成的涡结构是造成液膜断裂的主要原因。

     

  • 图 1  针栓式喷注器的结构及边界条件

    Figure 1.  Structure of pintle injector and boundary conditions

    图 2  局部网格加密

    Figure 2.  Zoomed local mesh

    图 3  基于梯度的自适应网格细化

    Figure 3.  Adaptive mesh refinement based on gradient

    图 4  模拟与试验喷雾的图像对比

    Figure 4.  Comparison of the simulated sprays with the experimental spray images

    图 5  喷雾锥角的比较

    Figure 5.  Comparisons of the spray cone angle

    图 6  三种不同网格对应的模拟雾化模式

    Figure 6.  Spray patterns from simulations with three different grids

    图 7  不同时刻液膜破碎过程(Lopen=0.4 mm)

    Figure 7.  Breakup process of liquid sheet at different instants (Lopen = 0.4 mm)

    图 8  不同时刻液膜的形成和破碎

    Figure 8.  Formation and breakup of liquid sheet at different instants

    图 9  液膜上液洞的形成及液桥的产生

    Figure 9.  Formation of liquid hole on liquid sheet and formation of liquid bridge

    图 10  K-H不稳定波的发展

    Figure 10.  Development of K-H unstable wave

    图 11  多个液洞合并及液桥的产生

    Figure 11.  Merge of multiple liquid holes and formation of liquid bridge

    图 12  中心液膜形成的液滴

    Figure 12.  Droplets formed in the central liquid sheet region

    图 13  液丝断裂形成的液滴

    Figure 13.  Droplets formation due to the fracture of the liquid ligaments

    图 14  液桥断裂形成的液滴

    Figure 14.  Droplets formation due to the fracture of the liquid bridge

    图 15  速度等值线(Lopen=0.4 mm,$\dot m_{{\rm{liquid}}} $=45.2 g/s)

    Figure 15.  Velocity contour (Lopen=0.4 mm,$\dot m_{{\rm{liquid}}} $=45.2 g/s)

    图 16  速度流线图(Lopen=0.4 mm,$ \dot m_{{\rm{liquid}}} $=45.2 g/s)

    Figure 16.  Velocity streamline (Lopen=0.4 mm,$ \dot m_{{\rm{liquid}}} $=45.2 g/s)

    图 17  液膜厚度

    Figure 17.  Liquid film thickness

    图 18  液膜厚度随时间的变化

    Figure 18.  Temporal evolution of liquid film thickness

    图 19  液膜破碎长度的定义

    Figure 19.  Definition of liquid sheet breakup length

    图 20  液膜破碎长度随时间的变化

    Figure 20.  Temporal evolution of liquid sheet breakup length

    表  1  针栓式喷注器的几何尺寸

    Table  1.   Geometrical dimensions of the pintle injector

    参数数值参数数值
    Dpost/mm8.0θpost/(°)30
    Dcg/mm4.55 θpt/(°)40
    Dpr/mm3.0rpost/mm3.0
    Dpt/mm8.0tpost/mm0.5
    tann/mm0.5Lopen/mm0.4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-14
  • 网络出版日期:  2022-11-22

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