基于长径比修正的飞艇对流换热准则关系式研究  

A heat transfer empirical correlation for the stratospheric airship based on its length-to-diameter ratio

作　　者：刘泉[1] 徐庶民[2] 钟伟[1] 杨渐志[1] 刘明侯[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,安徽合肥230027 [2]中国科学技术大学工程与材料科学实验中心,安徽合肥230027

出　　处：《中国科学技术大学学报》2013年第5期387-392,共6页JUSTC

基　　金：国家自然科学基金(11172296)资助

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°.

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 

分 类 号：TK172[动力工程及工程热物理—热能工程]