壁面振动诱发流固界面上流体粘滞-滑移流动机制的研究

项目名称： 壁面振动诱发流固界面上流体粘滞-滑移流动机制的研究

项目编号： No.51305355

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 刘雁

作者单位： 西北工业大学

项目金额： 26万元

中文摘要： 实验表明机翼局部弹性振动蒙皮与绕流耦合界面上的流体存在着粘滞-滑移（Stick-Slip）交替流动现象，初步研究认为该粘滞-滑移流动是解释翼面蒙皮小能量的局部法向振动能够增升减阻的原因之一，课题拟对壁面振动诱发流固界面上流体粘滞-滑移运动的机制进行深入研究。采用理论、数值分析结合试验研究，分析机翼局部弹性振动诱发边界层内流体的动量迁移和能量输运，分析该动量和能量对界面流体由无滑移产生滑移现象的驱动作用，研究壁面振动的幅值、频率等特性对边界层内动量迁移和能量输运的影响规律。针对以上内容，完善基于非平衡分子动力学等理论的数值模拟方法，用以模拟机翼局部振动弹性蒙皮与绕流界面上的流体微观动力学行为。项目的研究不仅对研究流-固耦合振动界面复杂的动力学行为具有学术意义，也对开发设计翼型前缘局部弹性结构的受控振动系统实现亚音速机翼延迟静态失速、产生高升力、降低阻力等方面具有工程应用价值。

中文关键词： 弹性壁面振动；边界层粘滞-滑移流动；非线性动力学；增升减阻；流动控制

英文摘要： The experiments demonstrate that there exists stick-slip motion on the interface between fluid and oscillating wall of airfoil, and it is considered that the stick-slip motion is one of factors which lead to lift enhancement and drag reduction for the airfoil under oscillation, therefore, the mechanism of such stick-slip motion induced by the local oscillation of wall will studied in detail. In combination with experiments, the momentum transfer and energy transport which are induced by the local oscillating wall of airfoil will be analyzed theoretically and experimently, the mechanisim of stick-slip motion excited by the momentum transfer and energy transport is then studied, and influences of the frequencies and amplitudes of the oscillating wall on the momentum transfer and energy transport are investigated further. For the purposes mentioned above, the non-equilibrium molecular dynamics simulation is used to simulate the dynamic behaviors of fluid in the boundary layer with oscillating boundary. The results are significant for the study of complex dynamics in the interface between fluid and oscillating wall and can be used to develop the local flexible structure to delay the stall, enhance the lift and reduce the drag.

英文关键词： Vibration of Flexible Wall；Stick-Slip Boundary Condition；Nonlinear Dynamics；Enhancement and Drug Reduction；Flow control