低空浮空器温度场数值计算研究
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摘要
浮空器工作过程中的温度场变化对其运行及控制等方面会产生重要影响。基于武汉市夏至日低空气象资料,运用计算流体力学软件Fluent及其提供的UDF接口,对浮空器内、外流场及温度场进行耦合计算。通过数值仿真得到浮空器蒙皮与内置氦气囊及内部气体的三维温度场。通过分析三维温度场变化情况,可知浮空器外部蒙皮材料局部温度受耦合传热影响变化明显,内部气体和内置氦气囊温度变化较小。
Temperature field changes during the operation of aerostats can have an important impact on their operation and control. Based on the low altitude meteorological data(atmospheric temperature, radiation, wind speed, air pressure,etc.)of the summer solstice day in Wuhan, the computational fluid dynamics software Fluent and its UDF(user-defined function)interface are used to carry out the coupling calculation of the internal flow field, external flow field, temperature field in the aerostat. The three-dimensional temperature field of the aerostat skin and the built-in helium balloon and internal gas is obtained by numerical simulation. By analyzing the variation of the three-dimensional temperature field, it can be seen that the local temperature of the outer skin material of the aerostat is significantly affected by the coupling heat transfer, and the temperature changes of the internal gas and the built-in helium balloon are small.
Temperature field changes during the operation of aerostats can have an important impact on their operation and control. Based on the low altitude meteorological data(atmospheric temperature, radiation, wind speed, air pressure,etc.)of the summer solstice day in Wuhan, the computational fluid dynamics software Fluent and its UDF(user-defined function)interface are used to carry out the coupling calculation of the internal flow field, external flow field, temperature field in the aerostat. The three-dimensional temperature field of the aerostat skin and the built-in helium balloon and internal gas is obtained by numerical simulation. By analyzing the variation of the three-dimensional temperature field, it can be seen that the local temperature of the outer skin material of the aerostat is significantly affected by the coupling heat transfer, and the temperature changes of the internal gas and the built-in helium balloon are small.
引文
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[2] DAI Q, FANG X, LI X, et al. Performance simulation of high altitude scientific balloons[J]. Advances in Space Research,2012, 49(6):1045-1052.
[3] STEFAN K. Thermal effects on a high altitude airship[C]//Lighter-Than Air Conference. 1983.
[4] CATHEY H J. Advances in the thermal analysis of scientific balloons[M]//Thermal analysis in the geosciences. SpringerVerlag, 2006:393-394.
[5]朱仁胜,张月,周隐.恒温条件下浮空气囊泄漏仿真[J].机械设计与制造,2018(2):91-93.
[6] HENZE M, WEIGAND B, WOLFERSDORF J V. Natural convection inside airships[C]//AIAA/ASME Joint Thermophysics and Heat Transfer Conference. 2006:219-223.
[7]方贤德,王伟志,李小建.平流层飞艇热仿真初步探讨[J].航天返回与遥感,2007,28(2):5-9.
[8]徐向华,程雪涛,梁新刚.平流层浮空器的热数值分析[J].清华大学学报(自然科学版),2009(11):1848-1851.
[9]程雪涛,徐向华,梁新刚.低空环境中浮空器的热数值模拟与实验研究[J].宇航学报,2010,31(10):2417-2421.
[10] DAI Q, FANG X, XU Y. Numerical study of forced convective heat transfer around a spherical aerostat[J]. Advances in Space Research, 2013, 52(12):2199-2203.
[11]于勇.FLUENT入门与进阶教程[M].北京:北京理工大学出版社,2008.
[12]张奕,郭恩震.传热学[M].南京:东南大学出版社,2004.
[13]章熙民,任泽霈.传热学[M].北京:中国建筑工业出版社,2004.
[14] HOTTEL H C. A simple model for estimating the transmittance of direct solar radiation through clear atmospheres[J]. Solar Energy, 1976, 18(2):129-134.
[15] LIU B Y H, JORDAN R C. The interrelationship and characteristic distribution of direct, diffuse and total solar radiation[J]. Solar Energy, 1960, 4(3):1-19.