The effect of detector installing structure on wall temperature measurement of vehicle
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摘要: 针对飞行试验中飞行器薄壁壳体测量温度与预测温度存在较大差异这一问题，采用气动热工程算法结合热传导计算方法，分析了测温探测器安装结构对测点温度的影响，并提出了改进措施。结果表明：对于薄壁结构飞行器在上升段有气动加热、其表面处于升温过程或热量由壳体表面向内部传导时，测温探测器安装结构对测点温度基本无影响。但当飞行器处于飞行中段，在辐射散热、表面温度低于壳体内部温度造成热量由壳体内部向外表面传导时，测点温度受原探测器安装结构影响明显，测量温度明显低于不装探测器时的预测温度；而采用本文提出的探测器安装方案，可明显降低对测点温度的影响，在飞行器的测点位置最大影响小于0.5K。Abstract: The effect of the detector installing structure on the measured point temperature is analyzed using engineering aero-thermodynamics and heat conduction computation. To diminish the effect, a temperature detector installing structure is brought out according to the vehicle shell structure. The result shows that the installing structure has no effect on the measurement point temperature when the surface temperature is rising or heat is transmitting from the surface to the interior. However, the measurement temperature using the original installing structure is obviously lower than the predicted point temperature without the detector when heat is transmitting from the interior to the surface during the flight middle course. The temperature detector installing structure proposed in the paper can greatly reduce the structure effect on the measured point temperature:the maximum deviation of the temperature due to the presence of the detector is less than 0.5K.
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Key words:
- temperature /
- aero-thermodynamics /
- heat conduction /
- shell structure /
- flight middle course
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图 7 测点计算温度随时间的变化曲线
Figure 7. Time variation of calculated temperatures at measured point
图 8 不同探测器结构及安装结构造成的测点温差
Figure 8. Temperature errors made by different detectors and installing structures
图 11 不同探测器及安装结构对测点1温度影响
Figure 11. Temperature errors made by different detectors and installing structures at measured point 1
图 12 不同探测器及安装结构对测点2温度影响
Figure 12. Temperature errors made by different detectors and installing structures at measured point 2
表 1 防热材料物性参数
Table 1. Parameters of glass fiber reinforced plastics
红外发射率 密度/(kg·m-3) 导热系数/(W·(m·K)-1) 比热/(J·(kg·K)-1) 0.85 1750 0.44 1000 
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表 2 铝合金物性参数
Table 2. Parameters of aluminum alloy
温度/K 298 373 423 473 523 573 比热/(J·(kg-1·K)-1) 921 921 1005 1047 1089 1089 密度/(kg·m-3) 2640 导热系数/(W·(m·K)-1) 125.6
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