表面V肋作用下的横向射流混合增强特性研究

张祺; 胡志云; 曹娜; 田伟

doi:10.13224/j.cnki.jasp.20240676

表面V肋作用下的横向射流混合增强特性研究

doi: 10.13224/j.cnki.jasp.20240676

张祺^{1, 2,},
胡志云²,
曹娜²,
田伟^{1, 2,*, ,}

1.
上海交通大学航空航天学院，上海 200240
2.
上海交通大学四川研究院，成都 100190

基金项目: 国家自然科学基金（11872039）；四川省科技计划资助项目（2022YFSY0002）

详细信息

作者简介:
张祺（1998-），男，硕士，主要从事燃烧室内混合增强研究。E-mail：15211146180@163.com

通讯作者:
田伟（1982-），男，副研究员，博士，主要从事流动测量技术开发、漩涡与分离流动以及流动控制的研究。E-mail：tianwei@sjtu.edu.cn

中图分类号: V211.74⁺6
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出版历程
- 收稿日期: 2024-10-02
- 网络出版日期: 2026-04-22

Enhancement of transverse jets mixing by using surface V-shaped rib

Zhang Qi^{1, 2
,},
Hu Zhiyun²,
Cao Na²,
Tian Wei^{1, 2,*
, ,}

1.
School of Aeronautics and Astronautics，Shanghai Jiao Tong University，Shanghai 200240，China
2.
Sichuan Research Institute，Shanghai Jiao Tong University，Chengdu 100190，China

摘要

摘要:
横向射流作为增强航空发动机燃烧室内掺混的常用手段已经被广泛研究与应用。本研究提出一种新型微尺度V肋结构，通过将其放置在横向射流上游来增强主流和射流的掺混。本研究通过采用基于Realizable k-ε湍流模型的数值模拟和粒子图像测速（PIV）实验测量，研究了动量通量比，V肋高度及V肋与射流孔距离对混合效率的影响规律。结果表明：V肋可以产生与横向射流中肾型涡对同向的涡系结构，从而通过增强肾型涡对强度提高主流与射流的掺混效率。在本研究的实验工况下，V肋诱导肾型涡对与射流肾型涡对融合后整体强度提升近70%，从而使得射流穿透深度增加了16%～46%。此外，相比于V肋与射流孔距离，V肋高度对射流及主流掺混的影响更为显著。V肋高度从0.25D增大到0.5D（D为射流孔直径）会使射流穿透深度增加5%～20%，而V肋与射流孔的距离从D增加到2D仅会导致穿透深度增加3%。
- 横向射流 /
- 微型V肋 /
- 混合增强 /
- 肾型涡对 /
- 涡融合
Abstract:
Transverse jets are widely studied and utilized to enhance the mixing within aero-engine combustors. This study introduced a novel micro-scale V-rib which was positioned upstream of the transverse jet to enhance the mixing between the main flow and the jet. The effects of momentum flux ratio, V-rib height, and the distance between the V-rib and the jet nozzle on mixing efficiency were investigated through numerical simulations using the Realizable k-ε turbulence model and Particle Image Velocimetry (PIV) experiments. The results demonstrated that the V-rib generated vortex structures aligned with the kidney shaped vortices in the transverse jet. The mixing between the main flow and the jet can be improved through enhancement of intensity of kidney shaped vortices. For the cases studied, the V-rib-induced kidney shaped vortices merged with the jet’s kidney vortices. This merger increased the overall strength by nearly 70%, resulting in a 16% to 46% increase in jet penetration depth. Furthermore, the V-rib height was found to have a more pronounced effect on the mixing compared with the distance between the V-rib and the jet nozzle. An increase in V-rib height from 0.25D to 0.5D (D is the diameter of the jet nozzle) led to a 5% to 20% increase in jet penetration depth, whereas altering the distance from D to 2D resulted in a mere 3% increase in penetration depth.
- transverse jets /
- micro-V-rib /
- mixing enhancement /
- kidney shaped vortices /
- vortex mergence

HTML

图 1 V肋/横向射流耦合实验构型示意图

Figure 1. Sketch of experimental configuration for coupled V-rib and transverse jet

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图 2 实验段及实验整体气路示意图

Figure 2. Sketch of experimental segment and total air circuit system

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图 3 仿真模型、边界条件及局部加密网格示意图

Figure 3. Sketch of simulation model, boundary conditions and unstructured meshing with local encryption

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图 4 实验与网格数为800万时仿真结果对比和网格数分别为500万、800万及1300万时的网格无关性验证

Figure 4. Validation comparison between experimental and simulation results （8 million grids） and grid independence validation for 5, 8, and 13 million grids

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图 5 V肋工况与基准工况下均流向速度分布

Figure 5. Distribution of the mean streamwise velocity between V-rib case and BASE case

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图 6 实验拟合V肋工况与基准工况射流穿透边界

Figure 6. Experimentally fitted jet penetration boundaries for the V-rib case and the base case

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图 7 展向肾型涡对形态及融合过程

Figure 7. Morphology of CVP in spanwise and mergence process

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图 8 CVP涡通量随流向位置变化规律

Figure 8. Transformation law of CVP vortex flux with streamwise position

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图 9 固定L=2D时V肋高度对穿透深度的影响

Figure 9. Effect of V-rib height on jet depth when fixing L=2D

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图 10 固定L=2D时V肋高度对CVP涡通量的影响

Figure 10. Effect of V-rib height on CVP vortex flux when fixing L=2D

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图 11 固定H=0.5D时相对距离L对穿透深度的影响

Figure 11. Effect of relative distance L on jet depth when fixing H=0.5D

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图 12 固定H=0.5D时相对距离L对CVP涡通量的影响

Figure 12. Effect of relative distance L on CVP vortex flux when fixing H=0.5D

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