涡扇发动机二元排气系统推力与红外特征多目标型面优化设计  

Multi-objective Contour Optimization Design of Thrust and Infrared Characteristics of Two-Dimensional Exhaust System of Turbofan Engine

作　　者：施小娟[1] 王丰[1] 吉洪湖[1] SHI Xiaojuan;WANG Feng;JI Honghu(College of Energy and Power Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《南京航空航天大学学报》2023年第4期597-605,共9页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家科技重大专项(J2019-Ⅲ-0009-0053)。

摘　　要：以涡扇发动机二元排气系统为例,以排气系统推力系数、3~5μm波段正尾向红外辐射特征为优化目标,以窄边探测面30°和宽边探测面90°方向的红外辐射特征为约束,以喷管喉道宽高比、喉道型面半径比、收敛半角和扩张半角为优化变量,在发动机地面军用动力状态,研究排气系统推力与红外特征的多目标型面优化设计。在设计过程中,基于正交试验法确定初始样本点,建立排气系统推力系数、红外辐射特征与设计变量间的RBF代理模型,采用自适应模拟退火算法对代理模型进行分析求解。结果表明:多目标优化方法可应用在排气系统推力与红外特征的兼容设计上,并可取得一定的效果,相比基准二元模型,仅通过型面设计,多目标优化后排气系统推力系数提高了5.3%,在正尾向的无量纲积分辐射强度降低了17%。Taking two⁃dimensional(2D)exhaust system of turbofan engine as an example,the multiobjective contour optimization design of thrust and infrared characteristics of exhaust system was studied when the engine is in military power on the ground.The optimization objectives were thrust coefficient and infrared radiation(IR)characteristics at 3—5μm in the positive tail direction of exhaust system.The constraint conditions were the IR characteristics of the narrow side detection plane at 30°and the wide side detection plane at 90°.The optimization variables were throat aspect ratio,throat radius ratio,convergence half angle and divergent half angle.In the design process,the initial sample points were determined by orthogonal experimental method.The RBF surrogate models of thrust coefficient and IR characteristics of exhaust system were established.The analysis and optimization was conducted with the adaptive simulated annealing algorithm.The results show that the multi-objective optimization method can be applied to the compatible design of thrust and infrared characteristics of exhaust system with good effects.The thrust coefficient of multi-objective optimized exhaust system is increased by 5.3%compared with the baseline 2D model.The dimensionless integral radiation intensity in the positive tail direction is reduced by 17%.

关 键 词：二元排气系统 推力 红外特征 型面 多目标优化 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]