摘要
在分析、计算钠热管的声速限时,把干饱和的钠热管蒸汽当作是理想气体,同时考虑加热段内蒸汽温度的轴向变化及管内蒸汽流动的两维性。利用 Navier—Stokes 方程、流体流动的连续性方程、理想气体的状态方程,推导出声速限的热流密度表达式。结果表明:忽略加热段内蒸汽温度的轴向变化及蒸汽流动的径向变化,钠热管声速限与实际误差在10%以内。理论与实验较为吻合。
This paper gives an analytical treatment of the sonic limit in sodium heat pipes.The dry sodium vapour is described as a perfect gas,the fluid of vapour is considered two-dimensional in evap- orator,and the axial vapour temperature is variable in evaporator.The formula of axial heat flux den- sity is derived from the equation of state for a perfect gas,the Navier—Stokes equation as well as continuity equation.When the radial component of the vapour velocity and the axial variation of the vapour temperature were neglected,the error of the sonic limit is within 10 per cent.
关键词
声速限
热流
密度
热管
钠
蒸汽压
sonic limit
two-dimension
axial heat flux density
