摘要
为了掌握双气囊临近空间飞艇升空过程中因保形需要而导致的复杂的热运动特性,文章建立了飞艇升空过程中的热平衡模型与运动模型,对某双气囊飞艇的保形升空过程进行仿真研究,获得了临近空间飞艇升空过程中轨迹与温度的变化规律。结果表明:临近空间飞艇保形升空时,升空速度呈现先降低后升高的变化趋势;受升空过程中氦气囊膨胀对外做功的影响,内部气体“过冷”现象明显,“过冷”最高可达20K;当飞艇升至驻空高度附近时,内部气体温度快速上升;受净浮力影响,飞艇的升空时间与充气质量呈反比;受夏至日太阳辐射投影面积的影响,飞艇升空过程中俯仰角越大,虽然阻力系数减小,但辐射得热降低,造成整体升空时间增加;气囊超压设置越大,飞艇升空时间越长。研究成果对临近空间飞艇的升空与运行控制具有一定的指导作用。
Aiming at the problem of predicting the thermal-motion characteristics of near space airship during ascent with preserving shape,a thermal and motion models of a double-balloons near space airship when ascents with preserving shape is established based on the analysis of heat transfer and force.Then,a simulation code is developed and the ascent progress is simulated.The ascent trajectory of the airship and the temperature of the internal gases after launching are obtained.Results showed that the ascent velocity decreases after launching and then increases smoothly.The temperatures of the contained gases are lower than the ambient temperature during ascent.Affected by expanding,the super cooling can be as high as 20K.The contained gases increased dramatically when the airship reaches the horvering altitude.The ascent time decreases with the increase of helium mass because of the net buoyancy.Although the drag coefficient decreases with the angle of pitch increasing during ascent,the ascent time increases with the increasement of angle of pitch due to the effect solar radiation on summer solstice.The ascent time increase with the increasement of overpressure.The results can be helpful to the design and operation for near space airship.
作者
郑志东
刘宁
韩笑雪
戴秋敏
ZHENG Zhidong;LIU Ning;HAN Xiaoxue;DAI Qiumin(Unit 32802 of the Chinese People's Liberation Army,Beijing 100191,China;Unit 31576 of the Chinese People’s Liberation Army,Beijing 100043,China;School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《航天返回与遥感》
CSCD
北大核心
2023年第2期24-32,共9页
Spacecraft Recovery & Remote Sensing
基金
国家自然科学基金(52006100)
江苏省自然科学基金(BK20190469)
装发预研课题(315087501)。
关键词
双气囊
保形升空
热运动特性
升空轨迹
临近空间飞艇
double ballonets
ascent with preserving shape
thermal-motion characteristic
ascent trajectory
near space airship
