中文摘要：

利用FLUENT对Ф58×1 800mm全玻璃真空管在不同发射率、真空度下空晒热性能进行数值模拟与分析,并通过空晒实验来验证模拟结果的正确性.数值分析结果表明：发射率越低,真空管的热损失越小,真空管的热性能越好.真空管空晒热性能随真空夹层压强的增加而减小,真空管空晒性能变化主要位于10-1∽10Pa范围,当压强小于10-1 Pa或大于10Pa时,由真空夹层间气体的导热损失引起的真空管热性能变化已不明显,为了保证良好的真空管热性能,真空夹层的真空度应当维持在10-2 Pa的数量级.

英文摘要：

In this paper,FLUENT has been used to simulate and analyze the stagnation performance of all-glass evacuated tubes,which size is58×1 800 mm,with different emittance and vacuum degree.In addition,the accuracy of numerical simulation also being verified through test.The numerical simulation results show that the lower is the emittance,the smaller is the heat loss and the better is the thermal performance of all-glass vacuumed tubes. What′s more,the stagnation performance of all-glass evacuated tube decreases with the increase of the air pressure in the vacuum jacket.The stagnation change of all-glass evacuated tube mainly in the range of10-1∽10Pa.When the air pressure is lower than10-1 Pa or greater than 10 Pa,the thermal performance change caused by heat conduction loss of air in the vacuum jacket is not obvious.Therefore the vacuum degree of air jacket should maintain in the order of 10-2 Pa in order to guarantee good thermal performance of all-glass evacuated tube.