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火箭冲压组合发动机包含多个工作模态,不同模态灵活组合的优势使其具有宽速域和广空域的工作特点,兼具加速和巡航的优点。火箭冲压组合发动机燃烧室中存在着亚声速、跨声速和超声速共存的流动结构,具有流动速度高、混合时间短、反应强度大、燃烧空间受限和波系结构复杂等特点。围绕火箭射流的强剪切性、燃烧模式的多样性和燃烧过程的动态性,分析了火箭冲压组合发动机的流动与燃烧特征,总结了面向发动机的高速湍流燃烧研究进展,研究了火箭冲压组合发动机中超声速反应混合层的生长特性、燃烧模式与空间释热分布和动态燃烧特性等问题。通过对碳氢燃料详细化学动力学机理的简化、校验,获得了分别适合于工程计算和细致燃烧机理研究的总包反应与框架机理。从火箭射流主导的反应混合层生长模型,宽范围、变来流工作中流动燃烧过程的不确定性和碳氢燃料动力学的简化与加速算法研究出发,提出了火箭冲压组合发动机基础研究中需要突破的问题,为认识发动机中多尺度燃烧机理、优化多模态燃烧组织提供参考。
Rocket stamping combined engine contains multiple modes of operation, the advantages of different modes of flexible combination of its wide-speed and wide-area operating characteristics, both acceleration and cruise advantages. There are many subsonic, transonic and supersonic flow structures in rocket ramjet combustor, which have the characteristics of high flow velocity, short mixing time, large reaction intensity, limited combustion space and complicated wave structure. Based on the strong shearing of the rocket jet, the diversity of the combustion modes and the dynamics of the combustion process, the flow and combustion characteristics of the rocket-stamped combined engine are analyzed. The research progress of high speed turbulent combustion for the engine is summarized. In the supersonic reaction mixture layer growth characteristics, combustion mode and spatial distribution of heat release and dynamic combustion characteristics and other issues. Through the simplification and verification of the detailed chemical kinetic mechanism of hydrocarbon fuel, the generalized reaction and framework mechanism are respectively obtained which are suitable for engineering calculation and detailed combustion mechanism research. Based on the rocket jet-driven reaction mixture layer growth model, the wide range, the uncertainty of flow combustion process in variable flow operation and the simplification and acceleration algorithm of hydrocarbon fuel dynamics, the basic research needs of rocket compression combined engine The breakthrough problem provides a reference for understanding multi-scale combustion mechanism in engine and optimizing multi-modal combustion organization.