掠海飞行器主动触水撞水力分析

Analysis on slamming force of active water impact for sea skimming vehicle

随着掠海飞行器飞行高度的不断降低,海浪和海况条件已成为制约其飞行高度的重要因素,严重时可引起飞行器姿态的倾覆。基于小升角楔形体入水模型和解析法,研究了掠海飞行器主动击水时所产生的撞水力变化特点,得到了击水滑板的外形参数和入水姿态角的选取准则,即入水弹道倾角-2°～0°,滑板等效斜升角β1≥10°,俯仰角变化范围0°～5°、滚动角变化范围-30°～30°,保证掠海飞行器在主动击水条件下产生的撞水力小于最大限定值20 gn的要求,实现了飞行器在恶劣海况下的掠海飞行。采用有限元法进行的三维仿真结果表明,此解析法所计算结果具有较高的可信度。

Wave and sea state were the important factor to restrict the altitude of sea skimming vehicle,which even could overturn the vehicle.Based on the model of water impact for wedge-shaped structure with small deadrise angle and analytical method,the slamming force changing characteristics of sea skimming vehicle were studied,and the criterion for water impact slide and attitude angle design was obtained： trajectory angle is-2°~0°,slide equivalent deadrise angle β1 isn＇t less than 10°,pitch angle is 0°~15°,roll angle is about-30°~30°.The slamming overload less than the limiting value 20 gn can be ensured,and the sea skimming flight under severs sea state can be redized.The results of three-dimensional mathematical simulation based on finite element method show that the analytical results in this paper is of high credibility.