MDBD等离子体激励器诱导流场耦合作用机理

徐泽阳; 高超; 王玉帅; 贾天昊; 王娜

doi:10.13224/j.cnki.jasp.20220170

MDBD等离子体激励器诱导流场耦合作用机理

doi: 10.13224/j.cnki.jasp.20220170

1.
西北工业大学航空学院，西安 710072
2.
西安航空学院液压技术研究院，西安 710077

基金项目: 国家自然科学基金（12172299，1190021162）

详细信息

作者简介:
徐泽阳（1990−），男，博士，主要从事等离子体流动控制方面的研究

中图分类号: V211.3
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- 文章访问数: 100
- HTML浏览量: 58
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-30
- 网络出版日期: 2023-11-01

Mechanism of coupling effect of flow field induced by MDBD actuator

1.
School of Aeronautics，Northwestern Polytechnical University，Xi’an 710072，China
2.
National Joint Engineering Research Center for Special Pump Technology，Xi’an Aeronautical Institute，Xi’an 710077，China

摘要

摘要:
为揭示多级介质阻挡放电（multi dielectric barrier discharge，MDBD）等离子体激励器诱导流场耦合机理，采用等离子体体积力模型与Navier-Stokes（N-S）方程结合的数值模拟方法，开展静止大气条件下4组激励器并联的MDBD诱导流场特性研究。结果表明：定常激励时，MDBD可以有效提高诱导射流速度与厚度、拓宽激励区域。非定常激励时，MDBD每级激励器对诱导涡起到持续的动量注入作用，延缓其耗散，并增强诱导涡的对流与掺混能力。激励频率对MDBD性能影响较大，激励频率f=20 Hz时，DBD诱导脉冲射流形成的低压区域对诱导涡起“拖拽”作用，使其加速向壁面靠近；f=50 Hz时，诱导涡出现融合现象，旋涡强度增强，对流速度提高，涡核高度降低；f=200 Hz时，诱导涡之间相互作用减弱，呈现为一组“涡簇”向激励器下游移动。
- 等离子体 /
- 流动控制 /
- MDBD激励器 /
- 诱导涡 /
- 激励频率
Abstract:
In order to reveal the mechanism of the coupling effect of the flow field induced by the multi dielectric barrier discharge (MDBD) actuator, the numerical simulation method based on the combination of the plasma body force model and Navier-Stokes (N-S) equation was employed to study the actuation characteristics of MDBD under the condition of the static atmosphere. The results indicated that, under the condition of steady actuation, the MDBD plasma actuator can effectively increase the induced flow velocity and thickness, and broaden the actuation area. In addition, under the condition of unsteady actuation, each actuator of MDBD provided a continuous momentum injection to the induced vortex, retarded its dissipation process and enhanced its convective and mixing capabilities. The cyclic actuation frequency had a large impact on MDBD performance. When the actuation frequency was f=20 Hz, the low-pressure region formed by the pulse jet accelerated the induced vortex towards the wall of the plate. The phenomenon of the induced vortex fusion was observed at the condition of f=50 Hz, which can enhance the induced vortex strength and velocity, and reduce the height of the induced vortex core. When the actuation frequency was f=200 Hz, the effect between the induced vortices was weakened, which was convected downstream of the actuator as a format of vortex clusters; in this condition, the effect of MDBD was similar to multiple independent SDBD actuators.
- plasma /
- flow control /
- MDBD actuator /
- induced vortex /
- actuation frequency

HTML

图 1 DBD激励器示意图

Figure 1. The sketch of DBD

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图 2 电势方程和电荷密度方程的边界条件

Figure 2. Boundary conditions for the equations of electric potential and charge density

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图 3 激励器尺寸与计算网格

Figure 3. Size and computational grids of actuator

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图 4 诱导速度场分布数值模拟与文献[17]实验结果对比

Figure 4. Comparison of Ref.[17] data and numerical results of the induced velocity field

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图 5 非定常激励流场结构数值模拟与文献[16]实验结果对比

Figure 5. Comparison of Ref.[16] data and numerical results of flow structure under unsteady actuation

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图 6 MDBD诱导速度场分布

Figure 6. Induced flow velocity field distribution of MDBD

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图 7 MDBD与SDBD在y=0.3 mm高度处壁面射流U_x对比

Figure 7. U_x comparison between MDBD and SDBD at the height of y=0.3 mm

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图 8 MDBD不同位置速度型

Figure 8. Velocity profile of MDBD at different positions

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图 9 MDBD放电波形

Figure 9. Waveforms of MDBD

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图 10 SDBD与MDBD诱导涡演化过程对比（f=10 Hz）

Figure 10. Comparison of induced vortex evolution processes of SDBD and MDBD （f=10 Hz）

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图 11 SDBD与MDBD诱导涡涡核轨迹比较（f=10 Hz）

Figure 11. Comparison of the induced vortex core trajectory of SDBD and MDBD （f=10 Hz）

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图 12 SDBD与MDBD诱导涡x方向对流速度对比（f=10 Hz）

Figure 12. Comparison of the x component velocity of induced vortex core of SDBD and MDBD （f=10 Hz）

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图 13 涡量分布与诱导涡涡核运动轨迹（f=20 Hz）

Figure 13. Vorticity distribution and the trajectory of induced vortex core （f=20 Hz）

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图 14 诱导涡x方向对流速度（f=20 Hz）

Figure 14. x component velocity of vortex core （f=20 Hz）

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图 15 涡量分布与诱导涡融合过程（f=50 Hz）

Figure 15. Vorticity distribution and induced vortex fusion process （f=50 Hz）

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图 16 诱导涡x方向对流速度与涡核运动轨迹（f=50 Hz）

Figure 16. x component velocity and the trajectory of induced vortex core （f=50 Hz）

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图 17 f=200 Hz时T时刻流线图与速度分布

Figure 17. Streamline and velocity distribution at the time of T with f=200 Hz

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图 18 y=0.3 mm高度脉冲射流x方向速度时-空分布结果与不同激励频率最大脉冲射流速度对比

Figure 18. Spatio-temporal contours of the x component velocity of the impulse jet and the maximum velocity of x component impulse jet with different actuation frequencies at heigh of y=0.3 mm

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