| 平片激振对分离剪切层的影响 |
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| 引用本文： | 徐诚.平片激振对分离剪切层的影响[J].力学学报,1994,26(5):521-529. |
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| 作者姓名： | 徐诚 |
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| 作者单位： | 南京理工大学机械学院 |
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| 基金项目： | VW－Stiftung基金,教委回国留学人员资助金 |
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| 摘 要： | 实验研究了从前缘加入周期性扰动，对一个楔形体模型形成的含回流的分离剪切层影响问题，实验雷诺数Ｒｅ＿ｃ＝６．６７×１０￣５．揭示了含回流的分离剪切层在未激振与激振状态下峰值中心频率的演化特征；探讨了分离剪切层局部响应频率与激振基本频率的关系。研究表明：激振作用改变了分离剪切层峰值中心频率向下游的演化过程，增加了湍流脉动强度和湍流混合，加快了分离剪切层增长，致使剪切层中心线下弯，从而分离剪切层再附或分离泡缩短。
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| 关 键 词： | 分离流动，控制，湍流结构，剪切层 |
THE EFFECTS OF EXTERNAL EXCITATION ON DEPARATED SHEAR LAYER |
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| Xu Cheng.THE EFFECTS OF EXTERNAL EXCITATION ON DEPARATED SHEAR LAYER[J].chinese journal of theoretical and applied mechanics,1994,26(5):521-529. |
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| Authors: | Xu Cheng |
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| Abstract: | An experimental research about the effects of external excitation on shearlayer bounding the reverse flow region was carried out.The model is a sharp leading-edgewedge like model with oscillating flap, The experimental Reynolds number is 6.67×10￣5。The inherent character of the evolution of peak frequency in shear layer bounding reverseregion for the casses with and without excitation is revealed.The response of local shearlayer to excitation is studied. The main function of excitation are to change the evol... |
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| Keywords: | Separation flow Control Turbulent structure Shear layer |
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