发动机湍流燃烧多物理耦合建模和仿真进展

Progress of Multi-physical Coupling Modeling and Simulation of Engine Turbulent Combustion

航空发动机燃烧室喷雾燃烧包含液滴破碎、雾化、蒸发、掺混、燃烧等多个物理过程,各物理过程相互耦合,产生出预混、非预混、自着火等多种燃烧模式,不同的燃烧模式表现出的湍流-化学反应相互作用也各不相同,对发展普适的湍流燃烧模型提出了巨大挑战。针对多物理场耦合的湍流燃烧过程进行物理建模成为湍流燃烧建模研究的主要任务之一。此外,航空发动机湍流燃烧研究也面对着工程设计和优化的客观需求,即发展效率和精度兼顾的高效湍流燃烧仿真方法并量化湍流燃烧控制物理机制,为燃烧组织调控提供指导。综合上述内容,从发动机两相喷雾燃烧模式、自适应燃烧建模和主控物理机制分析等方面点评和回顾了近期的基础研究进展,对当前的研究现状做了初步总结。

The physiochemical processes of turbulent spray combustion in aeroengine combustor may simultaneously involve droplet breakup,atomization,evaporation,reactants mixing,and combustion.Various physical processes are coupled with each other to produce premixed,non-premixed,and autoignition modes,and different combustion modes exhibit different turbulence-chemistry interactions,which poses great challenges to the development of a universal turbulent combustion model.Physical modeling of turbulent combustion pro⁃cess with multiple physical field coupling has become one of the main tasks of turbulent combustion modeling recently.On the other hand,the study of turbulent combustion in aeroengine is also facing the objective requirements of engineering design and optimization,that is,to develop turbulent combustion simulation methods with both efficiency and accuracy and to quantify the physical mechanism of turbulent combustion control,so as to provide guidance for combustion organization regulation.Based on the above,this paper reviews the recent ba⁃sic research progress from the aspects of the regime diagram of diluted spray flames,zone-adaptive turbulent combustion modeling,and the active subspace and Lagrangian analysis for controlling physiochemical processes,uncertainty quantification,and flame stabilization,and makes a preliminary summary of the current research status.