Numerical investigations of laminar-turbulent transition control in compressible streamwise corner flows

可压缩流向角流层流-湍流转捩控制的数值研究

• 批准号: 252196516
• 负责人: Professor Dr.-Ing. Ulrich Rist
• 金额: --
• 依托单位: Institut für Aerodynamik und Gasdynamik (IAG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/252196516?language=en
• 关键词: Numerical; investigations; laminar; turbulent; transition

The present fundamental research aims at a first-time investigation of active flow control in compressible, laminar streamwise corner flows based on linear stability theory and direct numerical simulations. The basic configuration is obtained when two flat plates meet at a right angle to form a corner or a wedge parallel to the free-stream flow direction. Different active means to control laminar-turbulent transition in the corner flow are to be investigated and compared here: Global versus local methods, as well as suction versus heating and cooling at the walls. These investigations aim at increasing the critical Reynolds number of the streamwise corner flow.In reference to the latest findings in our previous work, where the base-flow deformation observed in wind-tunnel experiments led to a destabilization of the flow, and where spatial transient disturbance growth was observed in direct numerical simulations, it is intended to investigate whether both processes can be stabilized by local suction in the corner region. These investigations aim at stabilization of the deformed boundary layer up to the critical Reynolds number of the undeformed and beyond, if possible.

本基础研究旨在首次基于线性稳定性理论和直接数值模拟研究可压缩层流向转角流动的主动流动控制。当两个平板以直角相交形成平行于自由流动方向的角或楔时，即可获得基本构型。本文将研究和比较控制转角流动中层流-湍流过渡的不同主动方法：全局方法与局部方法，以及吸力与壁面加热和冷却方法。这些研究的目的是提高沿流转角流动的临界雷诺数。参考我们之前工作的最新发现，在风洞实验中观察到的基流变形导致了流动的不稳定，以及在直接数值模拟中观察到的空间瞬态扰动增长，旨在研究这两个过程是否可以通过角落区域的局部吸力来稳定。这些研究的目的是稳定变形边界层到临界雷诺数的未变形和超越，如果可能的话。