航空学报2026，Vol.47Issue(8)：35-51,17.DOI:10.7527/S1000-6893.2025.32638
保护罩开启时高速飞行器内流场建立过程分析
Internal flow field development process of a hypersonic vehicle during protective cover separation
摘要
Abstract
The"simultaneous separation"sequence,involving the concurrent unlocking of the booster and protective cover from an air-breathing hypersonic vehicle,facilitates axial separation by utilizing the pressurized gas filling of the internal flow path.However,during the initial separation phase under this sequence,complex and variable pressure oscillations arise within the vehicle's internal flow path due to the interaction of moving shock waves,shock trains,and gas filling.Beyond conventional collision risks,a potential overpressure risk from the gas filling process is introduced into this sequence.Numerical simulations of developing flow field within the vehicle's internal flow path during protec-tive cover separation were carried out,using overset moving mesh technology and solving the unsteady Reynolds-Averaged Navier-Stokes(RANS)equations.The temporal flow field structures and unsteady pressure characteristics within the internal flow path were obtained.The evolution mechanism of the internal flow field during protective cover separation,as well as the influence mechanism between protective cover motion and stage distance variation on the flow field development during initial separation phase,were analyzed.The results indicate that during the initial sepa-ration phase under the"simultaneous separation"sequence,the filling and venting process of the internal flow path exhibits five distinct stages characterized by significantly different flow phenomena:gap-induced jet flow,moving shock sweep,shock train forward movement,gas backflow,and venting transition.The maximum pressure observed within the internal flow path during protective cover separation is primarily attributable to shock system pressurization,shock train pressurization,and gas filling pressurization/accumulation,rather than the pressure jump induced by the moving shock.The operational state of the internal flow path,whether started or unstarted,determines if the influence of cover motion and stage distance variation on the internal flow field manifests as a unidirectional dependency or a coupled interaction relationship.关键词
保护罩/内流场/多体分离/气体充填/压力特性/非定常流动Key words
protective cover/internal flow field/multi-body separation/gas filling/pressure characteristics/un-steady flow分类
航空航天引用本文复制引用
钟俊,范晓樯,熊冰,陈磊,唐啸..保护罩开启时高速飞行器内流场建立过程分析[J].航空学报,2026,47(8):35-51,17.基金项目
国家自然科学基金(12372298) National Natural Science Foundation of China(12372298) （12372298）
