Method for measuring high heat flux density of aircraft for a long duration
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摘要: 为实现对飞行器高热流密度热流的长时间测量, 文章提出了一种以与高导热金属蜂窝材料复合的相变材料作为热沉的热流计, 利用相变材料的潜热持续吸收热流计所接收的热量, 可以对1 MW·m-2的热流密度持续测量2000 s以上。利用显热容数值方法建立了高热流密度长时间持续测量的分析模型, 研究了热沉相变材料的热导率、相变温度、相变潜热等物性参数对测量方案的影响。研究结果表明, 应选取热导率较大、相变温度较低且高于初始环境温度, 以及相变潜热较大的相变材料作为长时间高热流密度测量的热沉材料。Abstract: This paper proposes a new method for measuring the high heat flux of a long duration. The heat sink is made of phase change materials (PCMs) and metal honeycomb materials with high thermal conductivity. The PCMs, with high latent heat, are used to absorb the heat continuously, which is received by the heat flux meter, then the heat flux as high as 1 MW·m-2 can be measured for a duration longer than 2000 s. An apparent heat capacity method is adopted to establish the analytical model for the measurements of high heat flux of a long duration. The model is validated by the experimental results and is used to study the influence of the physical properties of PCMs on the measuring method. The physical parameters include the thermal conductivity, the phase change latent heat and the phase transition temperature. It is shown that phase change material of higher heat sink thermal conductivity, lower phase transition temperature higher than the initial environmental temperature, and larger latent heat is suitable for measuring high heat flux of a long duration.
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Keywords:
- high heat flux density /
- thermometer /
- phase change material /
- physical parameters
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