低温风洞中液氮液滴的破碎特性模拟研究

苗庆硕; 魏震; 陈佳军; 张海洋; 钟富豪; 郑勉; 刘秀芳

doi:10.7652/xjtuxb202402009

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低温风洞中液氮液滴的破碎特性模拟研究

更新时间：2025-05-13

- 低温风洞中液氮液滴的破碎特性模拟研究
- Simulation of Breakup Characteristics of Liquid Nitrogen Droplets in Cryogenic Wind Tunnel
- 西安交通大学学报 2024年58卷第2期页码：91-99
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 中国空气动力研究与发展中心设备设计及测试技术研究所,四川,绵阳,621000
- 作者简介：
  
  : 2023-03-10。作者简介: 苗庆硕(1999—),男,硕士生
  刘秀芳(通信作者),女,副教授,博士生导师。基金项目: 国家自然科学基金资助项目(52076164)
- 基金信息：
  
  : 2023-03-10。作者简介: 苗庆硕(1999—),男,硕士生;刘秀芳(通信作者),女,副教授,博士生导师。基金项目: 国家自然科学基金资助项目(52076164);国家科技重大专项资助项目(J2019-Ⅲ-0010-0054);结冰与防除冰重点实验室开放课题资助项目(IADL20220107)。
- DOI：10.7652/xjtuxb202402009
  中图分类号： TK121
- 网络首发：2024-02-10，
  
  纸质出版：2024
- 稿件说明：
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苗庆硕, 魏震, 陈佳军, 等. 低温风洞中液氮液滴的破碎特性模拟研究[J]. 西安交通大学学报, 2024,58(2):91-99.

MIAO Qingshuo, WEI Zhen, CHEN Jiajun, et al. Simulation of Breakup Characteristics of Liquid Nitrogen Droplets in Cryogenic Wind Tunnel[J]. 2024, 58(2): 91-99.
苗庆硕, 魏震, 陈佳军, 等. 低温风洞中液氮液滴的破碎特性模拟研究[J]. 西安交通大学学报, 2024,58(2):91-99. DOI： 10.7652/xjtuxb202402009.

MIAO Qingshuo, WEI Zhen, CHEN Jiajun, et al. Simulation of Breakup Characteristics of Liquid Nitrogen Droplets in Cryogenic Wind Tunnel[J]. 2024, 58(2): 91-99. DOI： 10.7652/xjtuxb202402009.

摘要

为探究低温风洞中液氮液滴的破碎特性并阐明其破碎机理

基于耦合水平集流体体积函数(CLSVOF)方法

采用自适应局部网格加密技术

构建了二维液氮液滴破碎模型

对比了液氮液滴与常温液滴的形态演变规律

计算分析了韦伯数(We)对液氮液滴形态、变形系数及时间特性的影响规律。模拟结果表明:液氮液滴的We高于常温液滴

且更容易发生变形和破碎; 随着We的增大

液氮液滴依次发生袋状破碎、多模式破碎和剪切破碎; 液滴迎风面和背风面的压差均随时间呈现先增大后减小的规律

发生转变的原因是袋状结构形成或边缘液滴颗粒脱落; 不同液氮液滴破碎模式下

变形系数的变化规律差异明显; 液氮液滴无量纲初始破碎时间随We的增大而减小

在0<We<100时

临界变形系数维持在2.6附近。研究结果可为低温风洞中液氮喷雾冷却系统的优化提供理论依据。

Abstract

To explore the breakup characteristics of liquid nitrogen droplets in a cryogenic wind tunnel and determine the underlying mechanism

a two-dimensional liquid nitrogen droplet breakup model is established adopting the coupled level-set and volume of fluid(CLSVOF)method and adaptive local mesh refinement technology. The morphological evolution patterns of liquid nitrogen droplets and normal temperature droplets are compared

and the effects of We on the morphology

deformation coefficient and temporal features of liquid nitrogen droplets are analyzed. The results show that compared with normal temperature droplets

liquid nitrogen droplets have a higher We

which makes them more prone to deformation and fragmentation. As the We increases

the droplets sequentially undergo bag breakup

multimode breakup and shear breakup. For the three different breakup modes

the pressure difference between windward and leeward sides of the liquid nitrogen droplet increases first and then decreases with time. This is attributed to the formation of bag structures or the separation of droplets from the edge. Under different breakup modes of liquid nitrogen droplets

the pattern of deformation coefficient is distinctly different. The dimensionless initial breakup time of the droplet decreases with the increase of We. In the range of 0<We<100

the critical deformation coefficient is maintained around 2.6. This study can provide a theoretical basis for the optimization of liquid nitrogen spray cooling system in cryogenic wind tunnel.

关键词

Keywords

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