张旭,刘沛清,屈秋林.大型飞机机身垂直入水冲击特性数值研究[J].民用飞机设计与研究,2018,(2):25-
大型飞机机身垂直入水冲击特性数值研究
Numerical Study of Vertical Water Entry for Large Aircraft Fuselage
  
DOI:10.19416/j.cnki.1674-9804.2018.02.006
中文关键词:入水冲击  机身尾翘角  冲击力  冲击压强
英文关键词:water impact  upswept angle  impact force  impact pressure
基金项目:
作者单位
张旭,刘沛清,屈秋林 北京航空航天大学北京100191 
中文摘要:针对带有中央翼盒的某型飞机的机身,数值研究了不同入水速度、姿态角和尾翘角对入水过程中机身压强和冲击力的影响规律。数值模拟中,控制方程选为非定常可压缩流动的雷诺时均Navier tokes方程(RANS)和实现的k ε模型,使用体积分数(VOF)方法捕捉水气交界面的变化,采用整体动网格技术来模拟机身相对于水面的运动。结果分析表明:机身入水过程中压强峰值首先出现在喷溅根部,随后转移至机身底部;入水初期机身冲击力系数迅速增大,而后略有回落,入水后期由于中央翼盒冲击水面会导致冲击力系数再次迅速增大,而后小幅震荡。速度越大、姿态角越大、尾翘角越小,机身冲击力系数越小。
英文摘要:For the fuselage with the wing center section of a civil aircraft, the effects of water entry speed, pitch angle and upswept angle upon the pressure distribution on the fuselage and the impact force during the water entry process are investigated numerically. In the numerical simulation, the unsteady compressible Reynolds averaged Navier Stokes (RANS) equations and the realizable k ε turbulence model are solved; the volume of fluid method is used to capture the water air interface; the global moving mesh method is used to deal with the relative motion between the fuselage and the water. The results show that, the peak pressure firstly occurs on the spray root in the water entry process of the fuselage, and then shifts to the bottom of the fuselage. The coefficient of impact force increases sharply in the initial stage of water entry, and then deceases slightly. In the late stage, the wing center section impact on the water surface can once again result in sharp increase of impact force coefficient, and then change slightly. Larger impact speed, larger pitch angle and smaller upswept angle leads to smaller impact force coefficient on the fuselage.
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