航天推进技术研究院主办
[1]刘占一,许 婷,张魏静,等.热防护材料表面发射率测试研究[J].火箭推进,2019,45(04):79.
LIU Zhanyi,XU Ting,ZHANG Weijing,et al.Measurement study on surface emissivity of thermal protection material[J].Journal of Rocket Propulsion,2019,45(04):79.
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LIU Zhanyi,XU Ting,ZHANG Weijing,et al.Measurement study on surface emissivity of thermal protection material[J].Journal of Rocket Propulsion,2019,45(04):79.
热防护材料表面发射率测试研究
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
45
期数:
2019年04期
页码:
79
栏目:
测控与试验
出版日期:
2019-08-30
- Title:
- Measurement study on surface emissivity of thermal protection material
- 文章编号:
- 1672-9374(2019)04-0079-06
- Keywords:
- thermal protection material; surface emissivity; heat exchange system; temperature; heat flow inversion
- 分类号:
- V434.3
- 文献标志码:
- A
- 摘要:
- 提出了一种基于热流反演方法的表面发射率测试方法,并应用该方法对火箭发动机用热防护材料镀铝薄膜表面发射率进行了测量。试验在真空舱中进行,利用石英灯对试片进行加热,建立了由石英灯和试片组成的热交换系统,根据传热理论推导出了包含试片表面发射率的传热方程。依靠热电偶测量试片温度变化,反演得到表面热流,代入传热方程,获得试验用镀铝薄膜表面发射率约为0.12。此外,还采用集总参数法对镀铝薄膜表面发射率进行了计算,两者结果相差小于1.5%。提出的发射率测试方法虽然不能得到光谱发射率,但已经可以满足工程应用,且简单易行。
- Abstract:
- A method of surface emissivity measurement based on the inverse heat flow calculation was proposed,and it was utilized to measure the surface emissivity of aluminized thin film as the thermal protection material of liquid-propellant rocket engine.The test was carried out in a vacuum cabin and the specimens were heated by a quartz lamp.The heat exchange system consisting of quartz lamp and specimens was established,and the heat transfer equation including surface the emissivity of specimen was derived according to the heat transfer theory.The temperature variation was measured with thermocouple and the heat flow was obtained in an inverse way.Then,the heat transfer equation could be solved with the known heat flow,and the emissivity of aluminized thin film used in the test was about 0.12.In addition,the surface emissivity of aluminized thin film was calculated by another lumped parameter method,and the difference between the two results was less than 1.5%.Although the emissivity measurement approach proposed in this paper cannot achieve the spectral emissivity,it is applicable to engineering practice and easy to perform.
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备注/Memo
收稿日期:2019-02-22; 修回日期:2019-04-29基金项目:液体火箭发动机技术重点实验室项目(6142704180206)作者简介:刘占一(1985—),男,博士,研究领域为液体火箭发动机
更新日期/Last Update:
2019-08-31