浮空器气囊升空过程热特性预测仿真研究

摘要

During the launch process of aerostat,the change of convective radiative heat flux and heat transfer coefficient have effects on the aerostat thermal characteristics.In the paper,an algorithm is proposed to correct the heat transfer coefficient.Based on the finite element software FLUENT,the temperature field distribution change of the surface of aerostat was analyzed,and the curve of the average surface temperature of the aerostat was drawn.The simulation results show that due to the effects of radiation and convection for heat and elevation and other factors,the balloon surface temperature field distribution and the average temperature change in the launch process of aerostat,thus affecting the interior of the aerostat helium density distribution.The model was verified indirectly through experiment.The research results have a certain guiding function for design and production of aerostat and attitude adjustment in the process of.Launching.%针对浮空器气囊在升空过程中辐射热流及对流换热系数的变化对浮空器气囊热特性的影响,提出一种修正对流换热系数的算法.建立了基于有限元软件FLUENT球形浮空气囊模型,以夏至日为例分析球型浮空气囊在升空过程中气囊表面温度场分布的变化情况,得出气囊表面平均温度的变化曲线.仿真结果表明,在气囊升空的过程中,由于辐射、对流换热以及海拔高度等因素的影响,气囊表面温度场分布以及平均温度会发生实时变化,从而影响气囊内部气体密度分布.通过实验间接验证,模型可靠.研究结果对浮空器的设计生产以及升空过程中姿势的调整有一定的指导作用.