平流层飞艇热敏感因素分析

程晨,王晓亮

Thermal sensitivity factors analysis of stratospheric airships

Chen CHENG,Xiao-liang WANG

表 1 层流及湍流对流换热系数及努赛尔数计算式

Tab.1 Heat transfer coefficient and Nusselt number of laminar and turbulent convection

换热方式 外部自然对流换热系数 努赛尔数 层流换热 ${h_{ {\rm{free\_ex} } } } = { {N{u_{\rm{D} } } \cdot { {{k} }_{ {\rm{air} } } }} / D}$ $N{u_{{D} } } = { {{C} }_{\rm{c} } } \cdot Ra_{{D} }^{ {1 / 4} }$ 湍流换热 ${h_{ {\rm{free\_ex} } } } = { {N{u_x} \cdot { {{k} }_{ {\rm{air} } } }} / x}$ $N{u_x} = { {{C} }_{\rm{t} } } \cdot A(\theta ) \cdot Ra_x^{ {1 / 3} }$