Coordination Funds

协调基金

• 批准号: 428245937
• 负责人: Dr.-Ing. Thorsten Lutz
• 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 Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/428245937?language=en
• 关键词: Coordination; Funds

The aerodynamics of transport aircraft at the borders of the flight envelope are characterized by complex interactions and non-linear, transient aerodynamics. The resulting physical mechanisms are not fully understood and a prediction of aerodynamic properties, transient loads and aeroelastic behavior is a major challenge and requires the use of complex numerical models. Scale resolving methods are hardly validated for this application and need to be extended for higher Reynolds numbers in order to perform high-resolution simulations taking into account all physical effects. Apart from a lack of high resolution flow field measurements to study the underlying physical mechanisms, there are few scientifically usable and sufficiently detailed measurements of complete configurations for high, flight-relevant Reynolds numbers. The main goals of the research group 2895 are the comprehensive investigation of the unresolved physical issues in the high-speed stall of transport aircraft, the extension and qualification of numerical methods for this application and the modelling of unsteady flow and nonlinear aerodynamics with reduced order models. The local physical mechanisms and interactions must be understood to achieve a description of the aerodynamic effects for the complete configuration. The knowledge gain will be achieved by coordinated numerical and experimental studies of the flow physics in different parts of the flow field combined with corresponding investigations on a full aircraft configuration. The research group, which is organized in seven subprojects, carries out detailed studies on the buffet on the upper side of the wing, the development of the separated wake and its interaction with the tail plane. These studies will be carried out on the Airbus XRF-1 transport aircraft configuration, in which an ultra-high bypass nacelle will be integrated to study engine influences and local interactions. In order to enable measurements up to flight-relevant Reynolds numbers, the experiments will be conducted in the cryogenic wind tunnel ETW with funding from the HGF and DLR. The resulting numerical and experimental data base will be used for modelling and derivation of reduced order models and for flow physics studies. In addition, the fundamental flow phenomena will be studied numerically and experimentally by FOR 2895 on a generic tandem wing configuration at reduced Reynolds number, which allows spatially higher resolved measurements in relation to the relevant scales of the boundary layers.

运输机在飞行包线边界处的气动特性具有复杂的相互作用和非线性、瞬变的气动特性。由此产生的物理机制尚不完全清楚，对气动特性、瞬时载荷和气动弹性行为的预测是一个重大挑战，需要使用复杂的数值模型。尺度分辨方法很难在这种应用中得到验证，需要扩展到更高的雷诺数，以便执行考虑所有物理影响的高分辨率模拟。除了缺乏高分辨率的流场测量来研究潜在的物理机制外，很少有科学上可用的、足够详细的高飞行相关雷诺数完整构型的测量。2895研究组的主要目标是全面调查运输机高速失速中尚未解决的物理问题，扩展和鉴定这一应用的数值方法，并用降阶模型模拟非定常流动和非线性空气动力学。必须了解局部物理机制和相互作用，才能描述完整构型的气动效应。通过对流场不同部分的流动物理进行协调的数值和实验研究，并结合对全飞机外形的相应研究，将获得知识增益。该研究小组由七个子项目组成，对机翼上部的抖振、分离尾流的发展及其与尾翼的相互作用进行了详细的研究。这些研究将在空客XRF-1运输机配置上进行，其中将集成一个超高旁路机舱，以研究发动机影响和局部相互作用。为了能够测量到与飞行相关的雷诺数，实验将在低温风洞ETW中进行，资金来自HGF和DLR。由此产生的数值和实验数据库将用于降阶模型的建模和推导以及流动物理研究。此外，基本流动现象将通过数值和实验的方式进行研究，在减小雷诺数的通用串列机翼构型上使用2895，这将允许相对于相关的边界层尺度进行更高的空间分辨率测量。