摘要
提出一种新型的飞艇定点调节方案,并对该方案的定点调节模型进行静力学和热力学建模。在此基础上基于龙哥库塔法对所建立的模型进行计算,获得飞艇外膜、主氦气及副氦气温度变化曲线,并研究了日照时间、季节对上述结果的影响。研究结果表明:在定点过程中膜的温度、主氦气温度、副氦气温度随时间变化呈先增大,然后减小的趋势,其中膜的温度最低,主氦气温度和副氦气温度较为接近,三者温度都在13点左右达到最大值。同时,冬至日时,三者的温度都较夏至日时温度低,且三者的温差更大。不同纬度下膜的温度、主氦气温度、超压氦气温度变化趋势大体相同,随着纬度的增大,膜的温度、主氦气温度、超压氦气温度变化时长随纬度的增大而增大,但温度最大值随纬度的增大略微下降,这与不同纬度下太阳辐射强度的变化一致。同时,超压氦气最小质量随纬度的增大而增大,但增大幅度较小。进一步,纬度相对于季节来说对上述温度的影响较小。该研究结果对飞艇的定点飞行控制及热性能研究提供了技术参考。
A new fixed-point adjustment method of airship is proposed. Static and thermodynamic model of the fixed-point adjustment method is also developed. On this basis, the model is solved by the Runge-Kutta method. In the result, the temperature performance of the helium bag, vice helium bag and outer membrane of the airship are obtained, and the influences of sunshine time and seasons on the above results are conducted. The results show that the temperature of these parts on the airship increase first, and then decrease, in which the temperature of the membrane is the lowest, the temperature of the helium bag and the vice helium bag are relatively close, and the three temperatures reach the maximum at about 13 h. On the winter day, the temperatures of the three parts of the airship are lower than that on the summer day, and the temperature differences between each other are greater. At different latitudes, the changing trend of the temperature of the helium bag, vice helium bag and outer membrane are the same. With the increase of latitude, the temperature of the helium bag, vice helium and bag outer membrane increase, but the maximum temperature decreases with the increase of latitude which is consistent with the solar radiation intensity at different latitudes. At the same time, the minimum mass of the pressurized helium increases with the increase of latitude, but the increment is little. Further, the temperature is less affected by the latitude relative to the seasons. The results provide a technical reference for the fixed-point flight control and the research on the thermal performance of the airship.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2018年第18期154-161,共8页
Journal of Mechanical Engineering
关键词
平流层飞艇
定点
热特性
数值模拟
氦气囊
the stratosphere airship
floating
thermal performance
numerical simulation
helium bag
