跨域变体飞行器气动力热非层次多模型融合降阶方法  

Non⁃hierarchical multi⁃model fusion order reduction based on aerodynamic and aerothermodynamic characteristics for cross⁃domain morphing aircraft

作　　者：武宇飞 龙腾[1,2] 史人赫 张尧[1] WU Yufei;LONG Teng;SHI Renhe;ZHANG Yao(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Dynamics and Control of Flight Vehicle of Ministry of Education,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学宇航学院,北京100081 [2]北京理工大学飞行器动力学与控制教育部重点实验室,北京100081

出　　处：《航空学报》2023年第21期159-172,共14页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(52272360,52005288);北京理工大学研究生科研水平和创新能力提升专项计划(2022YCXZ017)。

摘　　要：跨域变体飞行器根据飞行状态改变构型以提升大空域宽速域飞行能力,已成为当前研究热点。建立了类乘波体跨域变体飞行器基于雷诺平均纳维–斯托克斯(RANS)方程的气动力热高精度模型、基于工程估算方法的气动力热低精度模型。针对高超声速气动力热仿真存在非层次多模型的特点,提出基于多层Kriging与二次规划的非层次多模型融合降阶方法(NMF-MKQP),推导解耦的均方误差表达式,将比例系数极大似然估计全局优化问题转化为二次规划问题,解析确定模型比例系数以降低构造成本,高效实现非层次多模型融合降阶。数值算例测试结果表明,降阶模型的近似精度与国际同类算法相比具有明显优势。基于气动力热特性降阶模型,揭示了后掠角及展长对跨域变体飞行器气动力热特性的影响规律,进而确定滑翔跨域飞行的变体方案。在减少最大热流的同时,变体方案通过增加升阻比,改善了飞行器跨域飞行性能。Cross-domain morphing aircraft can change their configurations to adapt to different flight conditions and improve flight capability in large airspace within wide speed range,consequently becoming a topic of interest.This pa⁃per constructs a high-fidelity aerodynamic and aerothermodynamic model of a quasi-waverider cross-domain morphing aircraft based on RANS equations and low-fidelity models based on engineering estimation methods.The Non-hierarchical Multi-model Fusion Method using Multi-level Kriging and Quadratic Programming(NMF-MKQP)is pro⁃posed considering the existence of non-hierarchical multi-fidelity models for hypersonic aerodynamic and aerothermo⁃dynamic analysis.The uncoupled expression of the mean squared error is derived to convert the global optimization problem of scaling factor maximum likelihood estimation into a quadratic programming problem,and the scaling factors are analytically determined accordingly.In this way,the efficiency of the proposed model reduction method is signifi⁃cantly improved while reducing the computation cost.The NMF-MKQP outperforms the state-of-the-art multi-fidelity surrogate modeling methods in terms of approximation accuracy.The aerodynamic and aerothermodynamic character⁃istics of cross-domain morphing aircraft with varying sweep angles and spans are assessed based on the constructed reduced-order model,further establishing a morphing strategy during cross-domain gliding.The flight performance in⁃creases with the lift-to-drag ratio,while ensuring a decreasing maximum heat flux.

关 键 词：跨域变体飞行器 气动力热 非层次多模型融合 模型降阶 机翼变后掠 机翼变展长 

分 类 号：V221[航空宇航科学与技术—飞行器设计]