Study On The High-Altitude Station-Keeping Behavior Of The Double-airbag Stratospheric Airship Based On The Thermal-trajectory Model

The airship is the earliest aircraft used by human,and the research of the airship started in the middle of the 19th century.The airship relies on the buoyancy provided by internal buoyant gas to achieve its ascent,descent and float.The airship has the char-acteristics of long duration flight,high load,low energy consumption and high security et al..Therefore,it has potential value on communication,early warning,environmen-t monitoring,transportation and missile interception et al..In recent years,with the development of space science and technology and the emergence of the oil and envi-ronmental issues,the advantages of airship are becoming more and more prominent.In this paper,the thermal-trajectory model for the double-gasbag stratospheric airship is studied deeply,based on which,the behavior of the stratospheric airship at high-altitude station-keeping condition is discussed deeply.First of all,a new meshing method for the skin and the diaphragm is proposed.The new method avoids the incompleteness of the grid of the gasbag skin and is conve-nient to deal with the change of the grid numbers of the skin and the diaphragm when the diaphragm moves up and down.Next,the thermal environments of the stratospheric airship at high-altitude station-keeping condition is introduced in detail.The thermal environments of the airship include the standard atmosphere,the radiative heat trans-fer and the convective heat transfer.The calculation method of spectral radiation is applied to the calculation of the visible and infrared spectra of the direct solar radia-tion.The view factor between the airship skin and the Earth,which takes into account the atmospheric attenuation of the Earth albedo,is introduced in detail.And the net heat method is applied to consider the influence of the diaphragm on the radiative heat transfer inside the airship.Then,The thermal model of the stratospheric airship is im-proved,in order to study the influence of the diaphragm on the thermal behavior of the stratosphere airship.What's more,a pressure control method for the stratospheric airship at high-altitude station-keeping condition is proposed.At last,some numerical simulations for the double-gasbag stratospheric airship at high-altitude station-keeping condition are conducted.The results show that the diaphragm has a great influence on the thermal behavior of the stratospheric airship,and the effectiveness of the pressure control method is verified,which lays the foundation for the design of the airship and the research of the airship in multi-gasbag case.