管-翅片复合式减涡器内旋涡破碎大涡模拟

张馨丹; 王锁芳; 沈文杰

doi:10.13224/j.cnki.jasp.20230122

管-翅片复合式减涡器内旋涡破碎大涡模拟

doi: 10.13224/j.cnki.jasp.20230122

南京航空航天大学能源与动力学院，南京 210016

基金项目: 国家科技重大专项（2017-Ⅲ-0011-0037）

详细信息

作者简介:
张馨丹（1998-），女，硕士生，研究领域为航空发动机流动与冷却。E-mail：xdzhang@nuaa.edu.cn

通讯作者:
王锁芳（1962-），男，教授，博士，研究领域为航空发动机流动与冷却。E-mail：sfwang@nuaa.edu.cn

中图分类号: V231.1
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- 被引次数: 0
出版历程
- 收稿日期: 2023-03-03
- 网络出版日期: 2024-06-05

Large eddy simulation of vortex broke down in tube-fin vortex reducer

College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

摘要

摘要:
为深入理解管-翅片复合式减涡器的减阻特性，采用大涡模拟方法对比分析了基础管式及管-翅片复合式减涡器内的湍流脉动和旋涡尺度，通过相干结构和功率谱等揭示了减涡器内旋涡破碎的机制。结果表明：基础管式减涡器内减涡管通过破碎大尺度旋涡来降低压损，而在基础管式减涡器内加入翅片能够进一步破坏上游艾克曼边界层，抑制大尺度旋涡的发展，同时降低的旋流比有效削弱减涡管入口处小尺度旋涡的激增现象，使得减涡管区域熵增降低，进而实现更高程度的旋涡抑制效果，且该效果随着翅片下端安装高度的降低更为显著。在管-翅片复合式减涡器盘腔中，能量积分长度尺度随径向高度的降低先增加后减小；与基础管式减涡器相比，能量积分长度尺度的峰值向高半径方向移动，而在盘腔下游区域相对较低。
- 共转盘腔 /
- 减涡管 /
- 翅片 /
- 相干涡 /
- 旋涡尺度
Abstract:
To further understand the drag reduction characteristics of tube-fin vortex reducers (TFVRs), large eddy simulation (LES) was used to compare and analyze the turbulent pulsation and vortex scales in a tube vortex reducer (TVR) and a TFVR, and the vortex breaking mechanism was revealed by coherent structures and power spectrums. Results showed that the tube in TVR reduced the pressure loss by breaking the large-scale vortex, while the fin in TFVR can further destroy the upstream Ekman boundary layer and inhibit the development of large-scale vortex, and the reduced swirl ratio effectively weakened the surge phenomenon of small scale vortex at the inlet of tube, increased the entropy in this region, and achieved a higher degree of vortex suppression, and this effect became more significant as the installation height of the lower end of the fins decreased. The energy integral length scale first increased and then decreased with the decrease of the radial height in TFVR. The peak value in TFVR moved towards the high radius direction, and the energy integral length scale was lower downstream of the cavity, compared with TVR.
- co-rotating cavity /
- tube /
- fin /
- coherent vortex /
- vortex scale

HTML

图 1 共转盘腔结构及几何尺寸

Figure 1. Co-rotating cavity structures

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图 2 共转盘腔尺寸

Figure 2. Co-rotating cavity parameters

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图 3 TFVR-1模型网格

Figure 3. Numerical grid of TFVR-1

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图 4 CFD数值结果与实验结果对比

Figure 4. Comparison of CFD and experimental results

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图 5 盘腔内亚格子活性参数分布

Figure 5. Distribution of sub grid-activity parameter in the cavity

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图 6 流线与归一化熵分布

Figure 6. Distribution of streamlines and normalized entropy

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图 7 旋流比分布

Figure 7. Distribution of swirl ratio

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图 8 盘腔径向静压系数分布

Figure 8. Distribution of static pressure coefficient along radial direction

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图 9 相干结构分布

Figure 9. Distribution of coherent structure

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图 10 湍动能分布

Figure 10. Distribution of turbulent kinetic energy

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图 11 不同径向高度下雷诺正应力随轴向距离的变化

Figure 11. Variations of Reynolds stress with axial distance at different radial heights

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图 12 功率谱

Figure 12. Power spectrum

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图 13 能量积分长度尺度

Figure 13. Energy integral length scale

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