金属海绵阻力特性数值计算

张丽芬; 葛鑫; 胡兴龙; 韦瑞荣; 余邦拓; 刘振侠

doi:10.13224/j.cnki.jasp.20220638

金属海绵阻力特性数值计算

doi: 10.13224/j.cnki.jasp.20220638

1.
西北工业大学动力与能源学院，西安 710072
2.
中国航空发动机集团有限公司航空发动机动力传输重点实验室，沈阳 110015

详细信息

作者简介:
张丽芬（1980-），女，副教授、硕士生导师，博士，主要从事航空发动机通风系统部件流动、换热以及金属海绵离心通风器的研究

中图分类号: V233.4
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- 文章访问数: 156
- HTML浏览量: 63
- PDF量: 49
- 被引次数: 0
出版历程
- 收稿日期: 2022-08-30
- 网络出版日期: 2024-03-07

Numerical calculation on resistance characteristics of metal foam

1.
School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China
2.
Key Laboratory of Power Transmission Technology on Aero-engine，Aero Engine Corporation of China，Shenyang 110015，China

摘要

摘要:
采用体心立方结构和Kelvin结构重建金属海绵的胞体结构，分析比较了单相流和两相流下金属海绵内部阻力、不同切角时金属海绵内部阻力。结果表明：①体心立方结构能够达到的孔隙率e的范围为68.01% < e < 98.01%；而Kelvin结构能够达到的孔隙率的范围为72.1% < e < 98.7%；②油滴质量分数为9.1%、进口速度小于20 m/s时，两相流计算的压降比单相流计算的压降高约5%；③切向角为30°的Kelvin结构金属海绵与实际金属海绵的阻力特性一致性较高，能够较好地表征金属海绵的阻力特性。
- 金属海绵 /
- 阻力特性 /
- 体心立方结构 /
- Kelvin结构 /
- 离心通风器
Abstract:
The cell structure of the metal foam was reconstructed using the body-centered cubic structure and Kelvin structure, respectively, and the internal resistances of the metal foam under single-phase flow and two-phase flow at different cutting angles were analyzed and compared. The results showed that: 1) the body-centered cubic structure can achieve a porosity e range of 68.01% < e < 98.01%; while the Kelvin structure can achieve a porosity range of 72.1% < e < 98.7%; 2）the pressure drop calculated by two-phase flow was about 5% higher than that calculated by single-phase flow when the mass fraction of oil droplets was 9.1% and the inlet velocity was less than 20 m/s; 3) the resistance characteristics of the Kelvin structure metal foam with a cutting angle of 30° were in high agreement with those of the actual metal foam, and can better characterize the resistance characteristics of the metal foam.
- metal foam /
- resistance characteristics /
- body-centered cubic structure /
- Kelvin structure /
- centrifugal ventilator

HTML

图 1 体心立方结构胞体

Figure 1. Body-centered cubic structure cell

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图 2 金属海绵简化模型

Figure 2. Simplified model of metal foam

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图 3 Kelvin结构

Figure 3. Kelvin structure

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图 4 Kelvin结构胞体

Figure 4. Kelvin structure cell

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图 5 Kelvin结构胞体阵列

Figure 5. Kelvin structure cell array

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图 6 金属海绵模型切取方向示意图

Figure 6. Sketch of cutting direction of metal foam model

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图 7 不同切角下体心立方结构

Figure 7. Body-centered cubic structure at different cutting angles

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图 8 不同切角下Kelvin结构

Figure 8. Kelvin structure at different cutting angles

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图 9 数值模拟计算域

Figure 9. Computational domain of numerical simulation

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图 10 计算域网格划分

Figure 10. Grid of computational domain

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图 11 金属海绵模型内两相流与单相流阻力对比

Figure 11. Two-phase flow versus single-phase flow resistance in metal foam model

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图 12 体心立方结构金属海绵压力云图与速度云图

Figure 12. Pressure and velocity contours of metal foam with body-centered cubic structure

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图 13 Kelvin结构金属海绵压力云图与速度云图

Figure 13. Pressure and velocity contours of metal foam with Kelvin structure

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图 14 不同切角金属海绵的阻力

Figure 14. Resistance of metal foam with different cutting angles

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图 15 Kelvin结构数值计算结果与实验值对比

Figure 15. Comparison of numerical results of Kelvin structure with experiment

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图 16 体心立方结构数值计算结果与实验值对比

Figure 16. Comparison of numerical results of body-centered cubic structure with experiment

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表 1 空气质量流量与油滴质量流量

Table 1. Air mass flow rate and lubricant mass flow rate

入口速度/ （m/s）	入口表面积/ 10⁻⁶ m²	空气质量流量/ 10⁻⁵ （kg/s）	油滴质量流量/ 10⁻⁶ （kg/s）
6	9	6.966	6.966
7	9	8.127	8.127
10	9	11.6	11.6
15	9	17.4	17.4
20	9	23.2	23.2

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表 2 文献[26]实验的金属海绵参数

Table 2. Experimental metal foam parameters in literature [26]

PPI	体积分数/%	密度/（g/m³）
30	9.8	0.450
20	6.6	0.410

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