Numerical and Experimental Study of Propeller Aeroelastics (NESPA)

研究的主要目标是研究现代螺旋桨设计中的失速颤振。它们用于非常高效的绿色航空运输，但失速颤振可能会对飞行安全产生严重影响。了解失速颤振现象背后的流动物理对于飞机操作和飞机设计至关重要。-测量失速颤振开始时螺旋桨周围的流动，并生成有史以来第一个关于这种现象的实验数据库-将测量数据与理论估计进行比较，以揭示当前航空航天工业设计工具的不足。新的研究内容-失速颤振是非定常分离流动和柔性结构(在这种情况下是螺旋桨)之间的复杂相互作用。由于这种复杂性，当螺旋桨失速并开始颤动时，很少有人尝试测量旋转叶片周围的流动。这将在这个项目中尝试。-使用先进的分析方法，可以同时测量流动和结构，到目前为止还没有尝试过，这个项目旨在生成文献中第一个适当的数据集，并获得我们进一步推动现代螺旋桨设计所需的洞察力。将使用的方法-新的转子试验台已经作为Mentor EPSRC项目的一部分提供，使当前的工作成为可能。这项工作从设计一种螺旋桨开始，这种螺旋桨可以在相对温和的条件下颤振，适合进行详细的实验研究，并在格拉斯哥的风洞和旋翼钻机的操作范围内。-将测量结果与通过早期项目提供的最先进预测进行比较也是以前从未尝试过的，这将允许在可以测量的内容与通过模拟计算和估计的内容之间产生协同效应。这种方法的融合是失速颤振研究中一种独特的新方法。

The key objectives of the research-Investigate stall flutter for modern propeller designs. These are used for very efficient green air transportation, but stall flutter may have severe effects on flight safety. Understanding the flow physics behind this phenomenon is crucial for aircraft operations and aircraft design.-Measure the flow around propellers at the onset of stall flutter and generate the 1st ever database of experiments for this phenomenon-Compare the measured data with theoretical estimates to reveal shortcomings in the current design tools of the aerospace industry.The novel research content-Stall flutter is a complex interaction between an unsteady separate flow and a flexible structure, in this case the propeller. Due to this complexity, there has been very few attempts to measure the flow around the rotating blades as the propeller stalls and begins to flutter. This will be attempted during this project.-Using advanced analysis methods that can measure flow and structure simultaneously has not so far been attempted and this project aims to generate the first proper data set in the literature and obtain the insight we need to further push the envelope of our modern propeller designs.The methodology to be used-A new rotor testing rig has been made available as part of the MENtOR EPSRC project that enables the current work. The work started with the design of a propeller that can flutter at relatively mild conditions suitable for detailed experimental investigations and within the operational limits of the wind tunnel and rotor rig of Glasgow.-Comparison of measurements with state-of-the-art predictions made available via an earlier project is also never attempted before and this will allow for synergies to be drawn between what can be measured and what can be computed and estimated through simulation. This fusion of methods is a unique, new approach in stall flutter research.