V275.1
航空科学基金资助项目（20200023052002）；江苏高校优势学科建设工程资助项目；航天科技集团重点实验室基金资助项目（M202100766）；工信部重点实验室开放课题资助项目（KLAECLS?E?201904）
- HOU Bin，SUN Zhi，ZHU Liyu，、WANG Zhe，LI Pei，SUN Jianhong
HOU Bin，SUN Zhi，ZHU Liyu，、WANG Zhe，LI Pei，SUN Jianhong
（1.Key Laboratory of Aircraft Environment Control and Life Support，MIIT，Nanjing University of Aeronautics and Astronautics Nanjing，210016， China）（2.Key Laboratory of Civil Aviation Emergency Science and Technology， CAAC，Nanjing University of Aeronautics and Astronautics Nanjing， 211106， China
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采用任意拉格朗日-欧拉（arbitrary Lagrangian Eulerian，简称ALE）方法和罚函数耦合方法对带应急救生浮囊的直升机着水冲击过程进行了流固耦合仿真计算，从浮囊吸能角度对直升机着水冲击过载的影响机理进行了阐述，揭示了不同初始俯仰角对直升机着水冲击过载特性的影响规律。研究结果表明：直升机着水冲击过程中垂向过载占主导作用；随着俯仰角的增大，过载峰值出现时间延迟，过载峰值显著增大；在大俯仰角下浮囊的吸能效果降低，从而导致着水冲击过载峰值大幅增大。对比零俯仰角工况，当初始俯仰姿态角为10°时，过载峰值从8.83g增加到18.89g，增加了115%；浮囊的吸能效果降低了9.12%。
In this paper，the arbitrary Lagrangian-Euler （ALE） method and penalty coupling method are used to simulate the processing of a helicopter with emergency floats landing on calm water. The influence mechanism of helicopter landing impact overload is expounded from the perspective of energy absorption mechanism. The influence law of different initial pitch angles on the impact overload of helicopter is revealed. Those results show that the vertical overload plays a dominant role in the helicopter landing impact process. With the increase of the pitch angle，the time of the peak impact appears delay，and the value of the peak impact increases. When the initial pitch angle is 10°，the peak impact increases from 8.83g to 18.89g compared with the case of the initial pitch angle is zero，with an increase of 115%. It is also found that the larger the pitch angle is， the lower energy-absorbing effect of the floats. And it leads to an increase in the peak impact value. When the initial pitch angle is 10°，the energy absorption effect of floats is reduced by 9.12% compared with the level flight.
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