斜射流撞壁成膜的液膜形状半经验模型

章宏宙; 黄勇; 袁韦韦

doi:10.13224/j.cnki.jasp.20220238

斜射流撞壁成膜的液膜形状半经验模型

doi: 10.13224/j.cnki.jasp.20220238

章宏宙^{1, 2, 3,},
黄勇^{1, 2, 3,*, ,},
袁韦韦^{1, 2, 3}

1.
北京航空航天大学能源与动力工程学院，北京 100191
2.
北京航空航天大学航空发动机气动热力国家级重点实验室，北京 100191
3.
先进航空发动机协同创新中心，北京 100191

详细信息

作者简介:
章宏宙（1996-），男，博士生，主要从事雾化机理研究

通讯作者:
黄勇（1964-），男，教授、博士生导师，博士，主要从事燃油雾化及燃烧室点火熄火机理研究。E-mail：yhuang@buaa.edu.cn

中图分类号: V434⁺.1
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- 被引次数: 0
出版历程
- 收稿日期: 2022-04-22
- 网络出版日期: 2022-09-09

Semi-empirical model for shape of liquid sheet formed by oblique jet impinging onto wall

ZHANG Hongzhou^{1, 2, 3
,},
HUANG Yong^{1, 2, 3,*
, ,},
YUAN Weiwei^{1, 2, 3}

1.
School of Energy and Power Engineering，Beihang University，Beijing 100191，China
2.
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics，Beihang University，Beijing 100191，China
3.
Collaborative Innovation Center for Advanced Aero-Engine，Beijing 100191，China

摘要

摘要:
通过求解斜射流撞壁形成液膜的厚度和速度分布，并结合能量方程和经验近似，得到预测液膜边界的半经验模型。该模型能直观地描述各因素的影响，无需数值迭代求解复杂方程。为了验证模型的准确性，开展了实验研究，分析了射流速度、撞击角度、黏性和表面张力的影响，然后比较了实验结果和模型结果。结果表明：该模型能很好地预测液膜边界，实验和模型边界曲线的相关系数都在0.99以上，即便对下游流动复杂区域也有很高的预测精度，此时误差约为1%。
- 斜射流 /
- 水平板 /
- 液膜 /
- 半经验模型 /
- 液膜冷却
Abstract:
By solving the thickness and velocity distribution of the liquid sheet formed by an oblique liquid jet impinging onto a wall, in combination with the energy equation and empirical approximation, a semi-empirical model was established to predict the liquid sheet boundary. The model can directly describe the influence of various factors without numerical iteration of the complex equations. To verify the accuracy of the model, experimental studies were carried out, and the influences of the jet velocity, impact angle, viscosity and surface tension were analyzed. Then, the model results were compared with the experimental results. It was found that the model had a good prediction ability for the liquid sheet shape. The correlation coefficients of the experimental and model boundary curves under all working conditions were larger than 0.99. The model also had a high prediction accuracy even for the downstream complex flow area, with the error about 1%.
- oblique jet /
- horizontal plate /
- liquid sheet /
- semi-empirical model /
- liquid sheet cooling

HTML

图 1 液膜流线图

Figure 1. Streamline pattern of a liquid sheet

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图 2 液膜示意图

Figure 2. Schematic diagram of a liquid sheet

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图 3 流量分配比例

Figure 3. Flow distribution ratio

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图 4 表面速度变化 (θ=30°)

Figure 4. Surface velocity variation (θ=30°)

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图 5 厚度变化

Figure 5. Thickness variation

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图 6 实验设置

Figure 6. Experimental setup

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图 7 液膜特征

Figure 7. Characteristics of the liquid sheet

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图 8 不同工况下的液膜原图

Figure 8. Raw images of the liquid sheet under different experimental conditions

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图 9 液膜边界识别

Figure 9. Boundary identification of the liquid sheet

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图 10 液膜边界的坐标提取

Figure 10. Coordinate extraction of the liquid sheet boundary

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图 11 射流速度的影响

Figure 11. Effects of jet velocity

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图 12 撞击角度的影响

Figure 12. Effects of impinging angle

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图 13 黏性的影响

Figure 13. Effects of viscosity

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图 14 表面张力的影响

Figure 14. Effects of surface tension

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图 15 各工况下边界径向长度的相对误差

Figure 15. Relative errors of radial length of boundary under all working conditions

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表 1 实验工况

Table 1. Experimental conditions

工况	$ {u_0} $/ （m/s）	$ \theta $/ （°）	$ \rho $/ （kg/m³）	$ \mu $/ （mPa·s）	$ \sigma $/ （mN/m）
1	9.8	30	997.6	0.94	72.88
2	13.4	30	997.6	0.94	72.88
3	18.9	30	997.6	0.94	72.88
4	9.8	45	997.6	0.94	72.88
5	9.8	75	997.6	0.94	72.88
6	13.4	30	1109.2	5.48	72.88
7	13.4	30	1134.6	9.57	72.88
8	13.4	30	997.6	0.94	40.62
9	13.4	30	997.6	0.94	36.81

下载: 导出CSV

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