摘要
目的解决220 V-6 kW石英灯管阵列在试件表面1200℃持续40 min以上试验过程中的热破坏问题。方法对灯管破坏形貌进行分析,通过热应力计算找到了爆灯的主要原因。针对现有加热器灯阵中灯头部位的热结构问题设计一套气体强制对流冷却装置,利用流体仿真分析方法获得出气管上不同出气孔孔径在相同间距条件下的气流速度、出气管外空流场状态和有灯阵时的灯头绕流冷却效果,为结构设计提供依据。结果在相同地面热环境模拟试验中成功进行了考核试验。对比有无冷却装置时的试验结果,对流换热装置能够增加灯管使用寿命,保证试验质量。结论针对灯头部位进行强制对流保护的方法,能够提高加热器在试验过程中的热环境模拟温度上限和有效试验时间,对高温长时间类热环境试验具有较好的应用和推广价值。
The work aims to solve the thermal damage problem in the test process of the 220 V-6 kW quartz lamp tube array on the surface of the test piece at 1200℃for more than 40 min.The damage appearance of the lamp was analyzed,and the main reason for the explosion lamp was found by thermal stress calculation.A gas forced convection cooling device was designed for the thermal structure problem of the lamp head in the existing heater lamp array.The fluid simulation method was used to obtain the airflow velocity of different outlet pores on the outlet pipe under the same spacing conditions,the state of the airflow field outside the outlet pipe,and the cooling effect of the lamp head around the lamp array,to provide a basis for structural design.The test was successfully carried out in the same ground thermal environment simulation test.Based on comparison of test results with or without cooling device,the convection heat exchange device can increase the service life of the lamp and ensure the test quality.The method of forced convection protection for the lamp head can improve the thermal environment simulation temperature upper limit and effective test time of the heater during the test.It has good application and popularization value for the high temperature long-term heat environment test.
作者
夏吝时
张利嵩
张凯
石宝丽
齐斌
XIA Lin-shi;ZHANG Li-song;ZHANG Kai;SHI Bao-li;QI Bin(Thermal Protection Experimental Center,Beijing Institute of Space Long March Vehicle,Beijing 100076,China)
出处
《装备环境工程》
CAS
2020年第10期75-81,共7页
Equipment Environmental Engineering
关键词
高温热环境
热应力
强制对流
使用寿命
high temperature thermal environment
thermal stress
forced convection
service life
