| 脉冲射流控制现象的自激-外激耦合模型 |
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| 引用本文： | 陆惟煜,黄国平,杨雨轩.脉冲射流控制现象的自激-外激耦合模型[J].航空动力学报,2022,37(1):181-190. |
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| 作者姓名： | 陆惟煜 黄国平 杨雨轩 |
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| 作者单位： | 1.南京工业大学 数理科学学院，南京 211800 |
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| 基金项目： | 江苏省自然科学基金（BK20200680）； 国家自然科学基金（52106046） |
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| 摘 要： | 为了阐释脉冲射流控制中出现的频率依赖性、位置依赖性、条件同步性及强度依赖性这4种现象，在弱非线性稳定性理论的基础上，建立了一种简化的自激-外激耦合模型，用于近似描述脉冲射流流动控制现象。该模型由偏微分方程组构成，特定情形下可简化为常微分方程进行求解，通过将求解结果与脉冲射流控制的数值模拟及实验数据进行对比，研究发现:该自激-外激耦合模型能定性或半定量反映实际脉冲射流控制中出现的4种现象。结合模型的分析表明:脉冲射流主要利用流动的非线性不稳定性机制，通过使流场与非定常激励产生同步运动，促进主流和分离流间的动量传递，从而实现自激-外激耦合流动控制作用，并表现出脉冲射流控制的4种典型现象。
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| 关 键 词： | 脉冲射流 流动分离 流动控制 耦合模型 非线性 非定常 流动稳定性 |
| 收稿时间： | 2021/2/17 0:00:00 |
Coupling model of self- and external-excitation for phenomena in pulsed jet flow control |
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| LU Weiyu,HUANG Guoping,YANG Yuxuan.Coupling model of self- and external-excitation for phenomena in pulsed jet flow control[J].Journal of Aerospace Power,2022,37(1):181-190. |
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| Authors: | LU Weiyu HUANG Guoping YANG Yuxuan |
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| Affiliation: | 1.School of Physical and Mathematical Sciences，Nanjing Tech University，Nanjing 211800，China2.College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China |
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| Abstract: | In order to explain four phenomena such as frequency-dependent，position-dependent，synchronization and intensity-dependent effects in pulsed jet flow control，a simplified coupling model of self- and external- excitation was established to approximately describe pulsed jet flow control based on the flow stability theory with weak nonlinearity.Composed of two partial differential equations，the model can be simplified as ordinary differential equations for solution in particular cases.By comparing the model results with those from numerical simulation and experiment of pulsed jet flow control，it can be found that the coupling model can qualitatively or semi-quantitatively reflect the four phenomena in actual pulsed jet flow control.Further analysis of the model showed that the pulsed jet mainly used the nonlinear flow instability mechanism to promote the momentum transfer between the main flow and the separated flow by making the flow field synchronize with unsteady excitation.As a result of self- and external- excitation coupling，flow control effects were realized and four typical and unique phenomena were presented. |
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| Keywords: | pulsed jet flow separation flow control coupling model nonlinearity unsteadiness flow stability |
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