AEROENGINE AEROACOUSTIC INTERACTIONS

传统上，计算和实验透平机械研究都是探索孤立的部件。然而，最近的斯坦福大学全引擎模拟承认，可能会发生强烈的组件相互作用，为了加深理解，必须考虑这些相互作用。这是将Savill和Peake最近在风扇和出口导向叶片上的EPSRC计算建模工作与Tucker最近通过风扇旁通流由EPSRC资助的喷气式飞机模拟工作联系起来的强烈动机。一旦连接起来，我们希望进一步向下游延伸，最终探索机舱剪切层和喷流与机身展开的机翼襟翼之间的相互作用。计算机模型的关键目标是预测发动机-机身-塔架之间的相互作用。在这里，朝着这个方向发展，我们希望进行雄心勃勃的大涡模拟和分析研究，以预测风扇、出口导叶、塔架之间的相互作用以及其他旁路管道组件的相互作用(真正的旁路管道不是具有多个气路堵塞的干净几何形状)。然后我们希望将这些信息输入喷气式喷嘴，探索喷气式管道对上游声音的散射以及这种散射与下游机身的相互作用。所获得的物理洞察力和模型应该为更安静、更环保的飞机奠定基础。值得注意的是，这项研究将努力利用传统的测量、分析和计算三位一体的方法。不过，前者将基于现有数据。

Traditionally both computational and experimental turbomachinery studies explore isolated components. However, the recent Stanford University whole engine simulation, acknowledges that strong component interactions can take place, and that to advance understanding these interactions must be accounted for. This is strong motivation for connecting Savill and Peake's recent EPSRC computational modelling work on the fan and outlet guide vanes to Tucker's recent EPSRC funded simulation work on the jet, through the fan bypass flow. Once connected, we then wish to extend further downstream, ultimately exploring the interaction of the nacelle shear layer and jet with the deployed wing flap of the airframe. The key objective for computer models is to predict engine-airframe-pylon interactions. Here, moving in this direction, we wish to perform ambitious large eddy simulation and analytical studies to predict the fan, outlet guide vane, pylon interaction along with other bypass duct component interactions (a real bypass duct is not a clean geometry with multiple gas path blockages). We then wish to feed this information into the jet nozzle, exploring the scattering of the upstream sound by the jet pipes and the interaction of this with the downstream airframe. The physical insights and models gained should lay foundations for quieter more environmentally friendly aircraft. Notably, the study will endeavour to exploit the traditional triad of measurement, analytical analysis and computation. However, the former will be based on existing data.