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Open AccessArticle

Forced Convection Heat Transfer for Stratospheric Airship Involved Flight State

1
Key Laboratory of Aircraft environment control and life support, MIIT, Nanjing University of Aeronautics & Astronautics, 29 Yudao Street, Nanjing 210016, China
2
College of Energy & Power Engineering, Jiangsu University of Science and Technology, 2 Mengxi, Jingkou, Zhenjiang 212003, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1294; https://doi.org/10.3390/app10041294
Received: 30 December 2019 / Revised: 6 February 2020 / Accepted: 9 February 2020 / Published: 14 February 2020
(This article belongs to the Section Energy)
Forced convection heat transfer is a significant factor for the thermal control of a stratospheric airship. However, most of researches were conducted without considering the influence of flight state causing serious errors. In order to accurately predict the forced convection heat transfer of the stratospheric airship at an angle of attack, firstly, an empirical correlation of Nusselt number (Nu) as function of Reynolds number (Re) andlength to diameter ratio (e) is developedunder horizontal state based on a validated computational fluid dynamic (CFD) method. Then, a correction factor K, considering its angle of attack (α), is proposed to modify this correlation. The results show that: (1) Nusselt number increases with the increase of Reynolds number, decreases as the length to diameter ratio changes from 2 ~ 6, and increases as the angle of attack changes from 0° ~ 20°. (2) At higher Reynolds number, the calculated results are 30 percent higher than those of previous studies with α = 20°. (3) Compared with α and e, the effect of Re on correction factor K can be ignored, and K is a strong equation of α and e. The efficiency of heat transfer is increased by 6 percent with α = 20°. The findings of this paper provide a technical reference for the thermal control of a stratospheric airship. View Full-Text
Keywords: stratospheric airship; angle of attack; forced convection heat transfer; flight state; thermal control stratospheric airship; angle of attack; forced convection heat transfer; flight state; thermal control
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MDPI and ACS Style

Pei, H.; Kong, B.; Jiang, Y.; Shi, H. Forced Convection Heat Transfer for Stratospheric Airship Involved Flight State. Appl. Sci. 2020, 10, 1294.

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