摘要
飞艇热控制是平流层飞艇应用中涉及的关键技术之一,而外部对流换热是平流层飞艇热控制的重要影响因素.为了准确预测飞艇换热,基于数值模拟,建立基于飞艇长径比的对流换热准则关系式,并与实验结果比较,发现其预测误差为±7%.与0°攻角换热相比,15°攻角时迎风面换热比背风面增大了10%左右,而总体换热增大7%.
Thermal control is one of the key technologies involved in stratospheric airship applications, and convective heat transfer is an important factor in the thermal control of a stratospheric airship. In order to accurately predict the heat transfer of an airship, using the numerical method, an empirical correlation of Nu number as a function of Re, Pr and l/d （length to diameter ratio） was established. Compared with experimental data, the uncertainty of the empirical correlation is about -I-7%. The effect of the attack angle of an airship on heat transfer performance was evaluated. It was found that the heat transfer at the windward side is 10% higher than that of the leeward side, while the average heat transfer of airship is 7%higher when the attack angle changes from 0° to 15°.
基金
国家自然科学基金(11172296)资助
关键词
平流层飞艇
热控制
热模型
对流换热
数值模拟
实验研究
stratospheric airship
thermal control
thermal model
convective heat transfer numericalsimulation
experimental study
