Investigation of reheat combustion systems using advanced CFD and modelling

喷气发动机再热系统容易产生热声振荡，其强度会增大，并带来结构损坏的风险。避免这种振荡在实际系统中是必不可少的，但可能导致性能限制。为了改进再热系统的设计，提高对热声振荡背后的物理机制的理解是必要的。该博士项目旨在通过使用高保真三维CFD来解决这个问题，包括大涡模拟和先进的湍流燃烧模型。这将允许考虑到实际再热系统的几何特征，也允许对火焰和流场的复杂热化学进行适当的处理。

Jet-engine reheat systems are prone to thermoacoustic oscillations which can grow in intensity and bring a risk of structural damage. Avoiding such oscillations is essential in practical systems but can lead to performance limitations. Improved understanding of the physical mechanisms behind thermoacoustic oscillations is necessary in order to inform the design of improved reheat systems.This PhD project aims to tackle the problem by using high-fidelity 3D CFD including Large Eddy Simulation together with advanced turbulent combustion modelling. This will allow the geometrical features of real reheat systems to be taken into account, and allow also for proper treatment of the complex thermochemistry of the flame and the flow field.