应用科技
應用科技
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Applied Science and Technology
2015年
5期
42-45
,共4页
人椅系统%气流吹袭%流场数值模拟%非结构混合网格
人椅繫統%氣流吹襲%流場數值模擬%非結構混閤網格
인의계통%기류취습%류장수치모의%비결구혼합망격
aircraft ejection seat system%windblast%flow fields numerical simulation%unstructured hybrid grids
为了对弹射救生人椅系统外流场进行数值模拟,建立了人椅系统三维几何模型,利用非结构混合网格对计算域进行离散,采用有限体积法求解Navier-Stokes方程. 应用SAS方法分别对人椅系统在马赫数为0.6,迎角为-90°~90°条件下进行数值模拟,计算结果与风洞试验结果吻合较好. 对无防护状态下的人椅系统进行数值模拟,根据飞行员面部、头颈部、四肢的受力情况分析高速气流吹袭下飞行员的损伤机理,对飞行员弹射救生以及高速气流吹袭装置的研制具有一定的指导意义.
為瞭對彈射救生人椅繫統外流場進行數值模擬,建立瞭人椅繫統三維幾何模型,利用非結構混閤網格對計算域進行離散,採用有限體積法求解Navier-Stokes方程. 應用SAS方法分彆對人椅繫統在馬赫數為0.6,迎角為-90°~90°條件下進行數值模擬,計算結果與風洞試驗結果吻閤較好. 對無防護狀態下的人椅繫統進行數值模擬,根據飛行員麵部、頭頸部、四肢的受力情況分析高速氣流吹襲下飛行員的損傷機理,對飛行員彈射救生以及高速氣流吹襲裝置的研製具有一定的指導意義.
위료대탄사구생인의계통외류장진행수치모의,건립료인의계통삼유궤하모형,이용비결구혼합망격대계산역진행리산,채용유한체적법구해Navier-Stokes방정. 응용SAS방법분별대인의계통재마혁수위0.6,영각위-90°~90°조건하진행수치모의,계산결과여풍동시험결과문합교호. 대무방호상태하적인의계통진행수치모의,근거비행원면부、두경부、사지적수력정황분석고속기류취습하비행원적손상궤리,대비행원탄사구생이급고속기류취습장치적연제구유일정적지도의의.
In order to simulate the flow fields around the aircraft ejection seat system, the three-dimensional geomet-rical model of the system is established, which uses unstructured grids for spatial discretisation, and solves the Navier-Stokes equations by the finite volume method. The scale adaptive simulation ( SAS) turbulence model is ap-plied to simulate the flow around the system at Mach number 0.6 and angles of attack varied from -90 to 90 de-grees. The results of numerical simulation agree well with that of the wind tunnel experiment. The system without protective device is numerically simulated and the mechanism of high-speed wind blast' s injury to the pilot' s face, head, neck and four limbs is investigated. This investigation is helpful to the ejection life-saving of pilots and the research and development of high-speed windblast protecting devices.
