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

在大型民用涡扇发动机中安装动力变速箱后，发动机的热管理系统必须散热的热量大大增加。其中很大一部分可能会通过热交换器排入旁路空气中。该研究项目旨在利用计算技术提高对这些换热器的热/空气动力学影响的了解，例如：-将热量排入旁路流动对旁路推力性能的影响-由于换热器内部的详细流动而产生的换热性能-换热器与旁路管道周围部件之间的空气动力相互作用。使用“传统的”CFD程序包来获得足够的分辨率将需要巨大的网格尺寸，导致计算成本在设计环境中是不可行的。因此，将开发新的/专门的计算技术，以便可以经济地模拟新的热交换器的几何结构/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