基于直二元喷管形面优化的涡扇发动机参数优化设计研究

为了在设计阶段提升带直二元喷管涡扇发动机的总体性能，本文开展了基于直二元喷管形面优化的涡扇发动机参数优化的研究。首先，建立了带直二元喷管的涡扇发动机模型，提出了发动机正后向排气系统红外辐射特征的计算方法，分析了直二元喷管尺寸对发动机性能参数的影响；其次，提出了基于序列二次规划算法的设计参数多目标优化方法，优化的目标包括高单位推力、低油耗和低红外辐射强度；最后，基于以上模型，利用序列二次规划算法对在设计点非加力情况下的涡扇发动机设计参数进行多目标优化。仿真结果表明：在设计点上，相较于不带直二元喷管的涡扇发动机，带直二元喷管的涡扇发动机具有更好的红外性能，并且通过算法优化后，带直二元喷管的涡扇发动机具有更好的性能参数。

Research on optimization design of turbofan engine parameters based on straight two-dimensional nozzle profile optimization

In order to improve the overall performance of turbofan engines with straight two-dimensional nozzle at the design stage, the research on optimization design of turbofan engine parameters based on straight two-dimensional nozzle profile optimization is carried out in this paper. Firstly, a turbofan engine model with straight two-dimensional nozzle is established, and the infrared radiation characteristic of the forward backward exhaust system of the engine is calculated. The influence of the dimension sizes of the straight two-dimensional nozzle on the engine performance parameters is analyzed. Secondly, a multi-objective optimization method of design parameters based on sequential quadratic programming algorithm is proposed. The optimized objectives include high specific thrust, low fuel consumption and low infrared radiation. Finally, based on the above model, the sequential quadratic programming algorithm is used to optimize the design parameters of turbofan engine without afterburning at design point. The simulation results show that, compared with the turbofan engine without straight two-dimensional nozzle, the turbofan engine with straight two-dimensional nozzle has better infrared performance at design point, and the turbofan engine with straight two-dimensional nozzle has better performance parameters after optimization.