涡扇发动机加力接通过程喷管延时调节影响研究

探索涡扇发动机加力过程中喷管喉部面积与加力供油量的匹配机理，寻找改善发动机加力特性的技术途径对发动机加力系统设计工作具有重要的意义。结合某型涡扇发动机加力供油时序、燃油填充时序和尾喷管面积调节规律，建立考虑加力燃烧室和外涵道动态容积效应的发动机加力接通与切断过程数学模型，进行涡扇发动机加力过程的特性计算，研究喷管喉部面积调节延迟对加力过渡过程的影响。结果表明：在加力接通过程中，喷管延迟调节对风扇稳定裕度和转速的影响不大于 4%，对主机稳定裕度和转速的影响不大于 1%；当喷管面积调节延迟或出现卡滞故障时，为了保证主机稳定工作，可适当减少加力供油量以改善喷管流通能力，提高安全稳定裕度；特殊情况下，则应继续增加主燃烧室供油量，以保证加力推力。

Numerical Simulation of the Influence of Nozzle Control Schedule onTurbofan Engine in Afterburner Transition

In order to explore the matching mechanism between nozzle throat area and afterburner fuel supply in turbofan engine afterburner process, and to find the technical way to improve the engine afterburner characteristics, the number of engine afterburner on and off process considering the dynamic volume effect of afterburner and external duct was established based on the afterburner fuel supply sequence, fuel filling sequence and tailpipe area regulation law of a turbofan engine The influence of nozzle throat area adjustment delay on the afterburner transition process is studied. The calculation example and result analysis show that: in the process of afterburner connection, the influence of nozzle delay adjustment on the fan stability margin and speed is not more than 4%, and the impact on the main engine stability margin and speed is not more than 1%; when the nozzle area adjustment is delayed or stuck, in order to ensure the main engine to work stably, the afterburner fuel supply can be appropriately reduced to improve the nozzle flow capacity and improve the safety and stability Under special circumstances, fuel supply of main combustion chamber should be increased to ensure afterburner thrust. The research results can provide reference for similar engine afterburner control law research, design and troubleshooting.