Investigations of cascaded micro-blowing for drag reduction in turbulent boundary layers

级联微吹在湍流边界层中减阻的研究

• 批准号: 246195626
• 负责人: Professor Dr.-Ing. Ulrich Rist
• 金额: --
• 依托单位: Institute of Theoretical and Applied Mechanics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246195626?language=en
• 关键词: Investigations; cascaded; micro; blowing; drag

The present proposal is part of an intended international cooperation with the Khristianovich Institute of Theoretical and Applied Mechanics of the Russian Academy of Science, Siberian Branch. The Russian partner will apply for his share of the funding at Russian Foundation of Basic Research.The purpose of the present proposal is to revive the concept of micro-blowing for turbulent skin friction drag reduction. This appears feasible because modern materials and new production methods allow manufacturing of micro-perforated smooth surfaces which do no longer exert additional roughness-induced drag on the main flow. Using a very recent observation of the Russian partner (obtained so far for a single blowing panel only) cascading of such panels in streamwise direction will lead to a considerable reduction of blowing mass-flow rates for a given drag reduction effect, i.e. a remarkable efficiency increase which has not been studied so far.The problem will be investigated using two complementary techniques: Detailed laboratory experiments with the latest flow-diagnostics devices in Russia and direct numerical simulations on a high-performance computer system that delivers insightful data that are not biased by a possibly inappropriate turbulence model in Germany. Very unique results can be expected allowing to extract new qualitative and quantitative information of great fundamental and practical importance. Prediction and modeling of boundary-layer control using micro-blowing will be improved and data for validation of turbulence models will be obtained, for the first time for this problem. The related considerations are pioneering in many aspects and address important aspects of drag reduction for fuel savings and hence minimizing pollution of the environment.

本建议是与俄罗斯科学院西伯利亚分支Khristianovich理论和应用力学研究所进行的国际合作的一部分。 俄罗斯合作伙伴将向俄罗斯基础研究基金会申请他的资助份额。本提案的目的是恢复用于湍流表面摩擦减阻的微吹概念。 这似乎是可行的，因为现代材料和新的生产方法允许制造微穿孔的光滑表面，不再施加额外的粗糙度引起的阻力的主流。 根据俄罗斯合作伙伴最近的观察，（迄今为止仅对单个吹气板获得）对于给定的减阻效果，这种板沿流向的级联将导致吹气质量流率的显著降低，即迄今为止尚未研究的显著效率增加。将使用两种互补技术来研究该问题：在俄罗斯使用最新的流动诊断设备进行详细的实验室实验，并在高性能计算机系统上进行直接数值模拟，该系统提供了有见地的数据，这些数据不会受到德国可能不适当的湍流模型的影响。 非常独特的结果可以预期允许提取新的定性和定量信息的重要基础和实际意义。 利用微吹将改进边界层控制的预测和建模，并将首次获得验证湍流模型的数据。 相关的考虑在许多方面都是开创性的，并解决了减少阻力以节省燃料的重要方面，从而最大限度地减少对环境的污染。