吸气式巡航飞行器气动设计参数灵敏度分析

Sensitivity Analysis of Air-breathing Cruise Vehicle Aerodynamic Design Parameters

基于吸气式巡航飞行器常用设计参数建立参数化模型,以Isight为平台实现几何建模、网格划分以及气动计算的集成,采用L27(312)正交试验表结合方差分析方法开展气动模型设计参数的灵敏度分析。同时,采用L16(215)正交试验表并设计交互作用表头,对喷管设计参数进行耦合作用分析。结果显示,除进气道第二楔角、第三楔角、燃烧室扩张角以及喷管下壁转折角外,其余设计参数对气动性能存在显著或极显著影响。在耦合作用方面,喷管各设计变量对气动性能的耦合影响显著。最后,在飞行器灵敏度分析的基础上,以升阻比最大为目标,选择主要影响参数开展了气动外形优化。

A parametric model is established for air-breathing cruise vehicles,based on common design parameters. Geometric modeling,meshing and aerodynamic calculation are integrated by Isight. By combining L27( 312) orthogonal test table with analysis of variance method,a sensitivity analysis of aerodynamic model design parameters is performed. Moreover,the coupling effect of nozzle design parameters is analyzed by using the L16(215) orthogonal test table and designing the interaction header. The results show that,except the second wedge angle,the third wedge angle,the expansion angle of the combustion chamber,and the angle of nozzle down wall,the other parameters have a significant or extremely significant effect on the aerodynamic performance. In terms of coupling analysis,the design variables of nozzle have a significant influence on the coupling of aerodynamic performance. Finally,based on the sensitivity analysis results of the aircraft,the main influence parameters are selected to optimize the aerodynamic shape,aiming at reaching the maximum lift-to-drag ratio.