Journal of Astronautics ›› 2016, Vol. 37 ›› Issue (7): 879-886.doi: 10.3873/j.issn.1000-1328.2016.07.015

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Investigation on Internal Natural Convection of Stratospheric Airship

ZHANG He lei, FANG Xian de, DAI Qiu min   

  1. 1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. College of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2015-09-25 Revised:2016-01-16 Online:2016-07-15 Published:2016-07-25

Abstract:

In this paper a thermal model of stratospheric airship is established, considering the effects of solar radiation, infrared radiation and convective heat transfer. Based on this, a simulation program is developed, and the skin temperature distribution is obtained. Taking the skin temperature distribution as the boundary condition, the internal natural convective heat transfer of a stratospheric airship is simulated using the software of Fluent. In different seasons and times, the flow characteristics, temperature distribution and heat transfer coefficient of the internal natural convection are calculated and analyzed. Compared to the simulation results, the Eckert-Jackson and Bayley correlations predict well for calculating the internal natural convective heat transfer coefficient of stratospheric airships, with the mean absolute deviation (MAD) of 22.6% and 24.1%, respectively.

Key words: Stratospheric airship, Thermal characteristic, Natural convection, Simulation

CLC Number: