| 基于POD的受激励后向台阶分离流低阶模型 |
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| 作者姓名： | 李卓越 白宏磊 高南 |
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| 作者单位： | 1.大连理工大学航空航天学院，辽宁大连 116024 |
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| 基金项目： | 国家自然科学基金项目11572078973项目2014CB744100 |
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| 摘 要： | 在对后向台阶流场进行合成射流激励并研究不同激励频率对流场发展影响的过程中，发现流场在低频激励条件下与中高频条件下表现完全不同.为了详细分析这一现象，使用本征正交分解法（proper orthogonal decomposition，POD）将由PIV方法测得的流速分布数据进行分解，采用相位平均手段对含湍流动能较大的主要模态间的关系进行分析，并使用主要模态对流场的主要运动形式进行还原.结果表明，流场在各条件下的主要运动形式均可用少量低阶模态加以基本概括，低频激励下低阶模态相图近似于Lissajous图形，并描述了剪切层在激励作用下的摆动过程.
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| 关 键 词： | 后向台阶流动 合成射流 POD分解 相位平均 |
| 收稿时间： | 2017-01-06 |
Reduced Order Models of Forced Flow over a Backward Facing Step Based on POD Method |
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| Institution: | 1.School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China2.Department of Civil & Environmental Engineering, the Hong Kong University of Science & Technology, Hong Kong 999077, China3.State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian 116024, China |
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| Abstract: | In the process of studying the influence of a synthetic jet actuator to a backward facing step field, it was noticed that flow field perturbed at frequency near St=0.04 is quite different from that at higher frequencies. In order to analyze this phenomenon, the snapshot proper orthogonal decomposition (POD) method was used to decompose the velocity distribution data collected by PIV, and low order motions were used to rebuild the main motion of the field. The result shows that the phase diagram of lower frequency perturb is similar to the Lissajous, and describes the flapping motion of the shear layer. |
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