Bypass integration for very large bypass ratio engines with gearboxes or other special thermal management requirements

大型民用涡轮风扇发动机中加入动力齿轮箱会导致必须由发动机热管理系统耗散的热量大量增加。其中很大一部分可能通过热交换器被排出到旁路空气中。该研究项目旨在使用计算技术来提高对这些热交换器的热/空气动力学影响的理解，例如：-将热量排出到旁路流的旁路推力性能的影响-热交换器本身内部的详细流动所产生的传热性能-热交换器与旁路管道周围组件之间的空气动力学相互作用感兴趣的领域包括重要的米级（旁路管道）和亚毫米级（HX矩阵）的特征。使用“常规”CFD软件包进行充分的解析将需要巨大的网格尺寸，从而导致在设计环境中不可行的计算成本。因此，要开发新的/专门的计算技术，以便可以经济地模拟新的热交换器几何形状/集成。这些方法将根据已建立的实验数据进行验证

The incorporation of a power gearbox into large civil turbofan engines results in a large increase in the heat that must be dissipated by the engine's thermal management system. A significant portion of this is likely to be rejected to the bypass air via heat exchanger. This research project aims to use computational techniques to improve the understanding of the thermal/aerodynamic impacts of these heat exchangers, such as:-The effect upon bypass thrust performance of rejecting heat to the bypass flow-The heat transfer performance resulting from the detailed flow within the heat exchanger itself-The aerodynamic interaction between the heat exchanger and the surrounding components of the bypass ductThe domain of interest includes features of both meter scale (bypass duct) and sub-millimetre scale (HX matrix) of importance. Adequate resolution of such using "conventional" CFD packages would require huge mesh dimensions, resulting in a computational cost which is infeasible in a design environment. As such, novel/specialised computational techniques are to be developed such that new heat exchanger geometries/integrations can be economically simulated. Such methods are to be validated against established experimental data