摘要
高空气球是一种无动力浮空器,是目前能在平流层工作的极少数飞行器之一,其气密性指标直接决定了在轨驻留时间。压力变化法是最常用的高空气球气密性检测方法,需充分考虑球体内部温度场带来的压力变化。本文基于球体内部流动特性和传热规律,建立温度场的基本数学模型,通过非线性拟合得到温度边界条件,采用有限体积法进行了数值研究,得到球体内部的温度场特性;基于温度和压力的耦合关系,采用微元分析法,间接得到压力场特性。最后,将仿真结果与试验结果进行了对比,结果表明:温度相对误差不超过1.6%,压力相对误差不超过0.54%,验证了仿真方案的准确性和正确性。
As one of the few aircraft working in the stratosphere, the high-altitude balloon is an unpowered aerostat. The gas tightness of the high-altitude balloon directly determines the time of flight in orbit. Pressure variation is the most common method used for aerostat air tightness detection and the pressure change resulting from the internal temperature change should be fully considered. In this paper, a basic mathematical model of temperature field was built based on flow characteristics and heat transfer law. Temperature boundary condition was obtained by nonlinear fitting and numerical simulation was carried out based on finite volume method. The temperature field characteristics in the ball were given by this analysis. Based on micro element analysis, the pressure field characteristics were given indirectly. Finally, the results show that the temperature error is less than 1.6% and the pressure error is less than 0.54% by comparing the simulation with the test results.
出处
《真空》
CAS
2017年第5期47-51,共5页
Vacuum
关键词
高空气球
温度场
压力场:传热分析
数值仿真
high-altitude balloon
temperature field
pressure field
heat transfer analysis
numerical simulation
