水上飞机着水动态过程的数值模拟与分析

Numerical Simulation and Analysis of Whole Process of Seaplane Landing

采用欧拉多相流模型和流体体积函数(VOF)法,分析某轻型电动飞机着水过程中不同速度、不同迎角和不同水况对纵向稳定性的影响。结果表明:飞机着水速度较小时,俯仰角会先增大,飞机出现抬头趋势;飞机着水速度较大时,俯仰角会先减小,飞机出现低头趋势;该飞机着水的最佳迎角为2°,且不得超过8°,否则会出现弹跳现象;飞机在波浪水面着水时与静水时的规律一致,速度越小,俯仰角变化范围越小,飞机吃水深度越深。

A numerical simulation scheme for seaplane landing flight is established by using euler multiphase flow model and volume of fluid(VOF)method.The effects of different speeds,angles of attack and water conditions on the longitudinal stability of aircraft during the landing process are analyzed.The main conclusions are as follows:when the aircraft has a small landing speed,the pitch angle is firstly increased,and the aircraft has a tendency to look up.When the aircraft hits a large speed,the pitch angle is firstly decreased,and the aircraft has a tendency to bow down.The best angle of attack for the aircraft to land on the water is 2°and must not exceed 8°,otherwise,a bouncing phenomenon will be occurred.In line with the law of still water,the smaller the speed of the aircraft when it is on the surface of the waves,the smaller the range of pitch angle changes,and the deeper the draft of the aircraft.