Turbulent drag of ridge-type surface structures

脊状表面结构的湍流阻力

• 批准号: 521110788
• 负责人: Professorin Dr.-Ing. Bettina Frohnapfel
• 金额: --
• 依托单位: Institut für Strömungsmechanik (ISTM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/521110788?language=en
• 关键词: Turbulent; drag; ridge; type; surface

Our present predictive capabilities for friction losses occurring in turbulent flow over rough surfaces include large uncertainties, especially for large scale inhomogeneous surfaces. The ridge-type surface structures of the present proposal are a model system for a spanwise variation in roughness that is widely employed in literature. The surface mounted ridges are oriented in streamwise flow direction. Previous work by our group has revealed that this simple surface geometry results in a complex drag behavior that can be classified by different drag regimes. The present project aims at investigating whether these drag regimes can be reproduced with different types of ridge geometries and which flow phenomena can be linked to the different drag regimes. We envisage that the obtained insights can provide important understanding for the further development of predictive roughness tools for inhomogeneous rough surfaces.

我们目前对粗糙表面上湍流中发生的摩擦损失的预测能力包括很大的不确定性，特别是对于大规模的非均匀表面。本方案的脊型表面结构是文献中广泛采用的粗糙度沿跨向变化的模型系统。表面安装的山脊以流向流动方向定向。我们课题组之前的工作表明，这种简单的表面几何形状导致了复杂的阻力行为，可以根据不同的阻力制度进行分类。本项目的目的是研究是否可以用不同类型的脊几何形状来再现这些阻力区域，以及哪些流动现象可以与不同的阻力区域相关联。我们认为，所获得的见解可以为进一步开发用于非均匀粗糙表面的预测粗糙度工具提供重要的理解。