背面喷涂高辐射涂层的发动机防热材料电弧加热试验模拟方法

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背面喷涂高辐射涂层的发动机防热材料电弧加热试验模拟方法
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作者单位:中国航天空气动力技术研究院
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Arc鄄Heating Test Simulation Method of Engine ThermalProtection Materials With High鄄Emissivity Rear Coating

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摘要:

采用等离子电弧加热器双模型矩形湍流导管试验技术模拟了发动机内流热环境,对背面喷涂了

高辐射涂层的发动机防热材料进行了热防护性能考核。利用改进的试验件安装方法,在防热材料的背面提供

了开敞式的常温环境,使防热材料的高温背面能够对周围常温环境辐射散热,模拟了防热材料背面的换热环

境。采用K 型热电偶和单色红外测温仪测量了防热材料背面高辐射涂层的温度。根据以上两种不同测温方

式测量的温度曲线,得到了该背面喷涂的高辐射涂层材料的光谱发射率随温度的变化曲线。试验结果表明:背

面喷涂了高辐射涂层的材料背面温度比材料背面没有涂层的低了81. 1 K;当温度在1 103 ~1 153 K 时,该高辐

射涂层材料的光谱发射率着姿(姿=1. 6 滋m)为0. 89 ~0. 77,随温度升高,着姿呈下降趋势。

Abstract:

The inner flow thermal environment of engine has been simulated by the arc鄄heater double鄄models

rectangle turbulent duct technique in this paper. And the thermal protection performance of the thermal protection ma鄄

terials with high鄄emissivity rear coating has been tested. The improved model installation method, which can provide

open鄄type environment with normal temperature in the material rear, can make sure that the rear coating of material

can radiated energy to the atmosphere or wall with normal temperature. And the heat transfer environment of the mate鄄

rial rear has been simulation by this method. The type鄄K thermocouples and single鄄wavelength infrared thermometer

were used to measure the high鄄emissivity rear coating temperature. According to the rear temperatures measured by

the two kinds of instruments, the spectral emissivity vs. temperature curve can be found. The results show that the

rear temperature of thermal protection materials with high鄄emissivity rear coating is 81. 1 K lower than that without

high鄄emissivity rear coating. The spectral emissivity of high鄄emissivity rear coating 着姿(姿=1. 6 滋m) is 0. 89 to 0. 77

for the temperature range from 1 103 to 1 153 K, and 着姿decreases when the temperature increases.

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涂建强.背面喷涂高辐射涂层的发动机防热材料电弧加热试验模拟方法[J].宇航材料工艺,2013,43(5).

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在线发布日期: 2016-11-28
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