Heat and Mass Transfer in Simulations of Fuel Atomisation

燃油雾化过程几乎影响燃气轮机燃烧系统性能的所有方面，高保真仿真是补充实验结果的有价值的工具。作为该CDT的一部分，之前的工作已经开发了一种模拟燃料雾化的计算方法，该方法基于流体多相法的耦合水平集体积和自适应网格细化。目前，这些模拟是不可压缩和等温的，这意味着在现实中同时发生的雾化和蒸发过程不能同时模拟。在代表真实燃烧系统的温度下，燃料的蒸发是一个重要而重要的过程——所有燃料在燃烧之前都应该以蒸汽形式存在——因此，在现有方法中实现蒸发将使重要的新物理学得以研究。本项目将从使用界面解析方法研究单个液滴的蒸发开始，其中液滴的形状由计算网格解析，并考虑可以通过更好地确定界面位置来进行改进。最终目标是模拟液体燃料的同时雾化和蒸发。

The fuel atomisation process affects nearly all aspects of gas turbine combustion system performance, and high-fidelity simulations are a valuable tool to compliment experimental results. Previous work as part of this CDT has developed a computational method for simulations of fuel atomisation, based on the Coupled Level Set Volume of Fluid multiphase method together with Adaptive Mesh Refinement. Currently, these simulations are incompressible and isothermal which means that the processes of atomisation and evaporation, which in reality occur simultaneously, cannot be simulated at the same time. At temperatures representative of a real combustion system, the evaporation of fuel is a significant and important process - all fuel should be in vapour form before it is combusted - and so enabling evaporation in the existing method will allow significant new physics to be investigated. This project will begin by investigating the evaporation of single droplets using interface resolving methods, in which the shape of the droplet is resolved by the computational mesh, and consider improvements that can be made with better determination of the interface location. The ultimate objective is to produce simulations of simultaneous atomisation and evaporation of liquid fuel.