引入DMD方法研究有/无控气流分离的动态结构

doi:10.7527/S1000-6893.2016.120876

流体力学与飞行力学

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引入DMD方法研究有/无控气流分离的动态结构

洪树立^1,2, 黄国平^1,2

1. 南京航空航天大学能源与动力学院, 南京 210016;
2. 南京航空航天大学江苏省航空动力系统重点实验室, 南京 210016

收稿日期:2016-10-21 修回日期:2016-11-18 出版日期:2017-08-15 发布日期:2017-01-11
通讯作者: 洪树立,E-mail:hong_0815@163.com E-mail:hong_0815@163.com
基金资助:
国家自然科学基金（51176072）

Introducing DMD method to study dynamic structures of flow separation with and without control

HONG Shuli^1,2, HUANG Guoping^1,2

1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Naning 210016, China

Received:2016-10-21 Revised:2016-11-18 Online:2017-08-15 Published:2017-01-11
Supported by:
National Natural Science Foundation of China (51176072)

摘要/Abstract

摘要：

为分析非定常流动控制技术抑制分离流的机理，对弯曲扩压通道的试验模型进行了数值模拟，针对扩压通道在无控和采用最佳射流频率状态下的计算结果引入了动力模态分解（DMD）技术进行分析。通过DMD技术能够将包含时空信息的扩压通道复杂流场进行分解，捕获流场包含的动力信息和对应的拟序流动结构。将无控和有控流场分解的结果进行对比分析后表明：采用有效激励措施时，和脱落涡频率一致的涡系对流场的影响更加突显，流场整体上表现得更加有序；非定常控制抑制了一部分涡的增长，使得各模态整体上更加稳定；而有控流场占主导地位的涡系结构相比无控流场较为有序，且对主流区未形成明显的直接影响。

关键词: 流动分离, 非定常, 流动控制, 拟序结构, 动力模态分解(DMD)

Abstract:

To analyze the mechanism of depressing flow separation with unsteady flow control technology, a numerical simulation for the experimental model of the divergent channel is carried out. Dynamic mode decomposition (DMD) technology is adopted to study the flow field of the curved divergent channel with and without pulsed jet control. With DMD technology, the complex flow field of the divergent channel containing spatial and temporal information can be decomposed hierarchically, and dynamical information as well as spatial coherent structure corresponding to the vortex can be captured and rendered. A comparison of the decomposed flow fields with and without control shows that with effective excitation, the coherent structure with the frequency approximating the frequency of the shedding vortex becomes more dominant in the initial flow field, and the overall flow field turns out be to more ordered. Some coherent structures, decomposed from flow field without control, are suppressed to make all modes more steady. The dominant structure of the controlled flow field has no obvious influence on the main flow.

Key words: flow separation, unsteady, flow control, coherent structure, dynamic mode decomposition (DMD)

中图分类号:

V231.3

洪树立, 黄国平. 引入DMD方法研究有/无控气流分离的动态结构[J]. 航空学报, 2017, 38(8): 120876-120876.

HONG Shuli, HUANG Guoping. Introducing DMD method to study dynamic structures of flow separation with and without control[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(8): 120876-120876.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

引入DMD方法研究有/无控气流分离的动态结构

Introducing DMD method to study dynamic structures of flow separation with and without control

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