振动环境对相变组件热控性能影响的实验

为了研究振动环境对相变组件热控性能的影响，制备了基于纯硬脂酸和硬脂酸/泡沫铜复合相变材料的两种相变热控实验件，并进行了静止和振动环境中的热控实验。实验结果表明:泡沫铜的存在能够有效地强化相变组件的热控性能，在5000W/m2时，添加泡沫铜后平衡温度降低了19℃，有效热控时间延长了19.4%；在振动环境下，纯硬脂酸实验件的平衡温度降低了9.5℃，有效热控时间延长了13.2%；硬脂酸/泡沫铜实验件的有效热控时间延长了10.5%，振动带来的强迫对流能够有效强化相变组件的热控性能；并且相对于振动频率，振幅变化对影响结果的扰动较小，在一定的频率范围内，振动的影响随着频率的增加而变大。该研究可以为机载电子设备相变热控技术的应用提供参考。 

Experiment on the thermal management performance of phase change material under vibration environment

In order to study the thermal management performance of phase change material based heat sinks under vibration environment, two heat sinks based on pure stearic acid and stearic acid/foam copper phase change materials were prepared and experimentalized under static and vibrational environments. The experimental results showed that the presence of copper foam can effectively enhance the thermal performance of phase change material based heat sinks. When the heat flux was 5000W/m2, the equilibrium temperature decreased by 19℃ after adding copper foam, and the effective thermal control time was extended by 19.4%. Under the vibration environment, the equilibrium temperature of pure stearic acid test specimen was reduced by 9.5℃, the effective thermal control time was extended by 13.2%, and the effective thermal control time of the stearic acid/foam copper test specimen was extended by 10.5%. Hence forced convection caused by vibration can enhance the thermal performance of phase change material based heat sinks. With respect to the vibration frequency, the amplitude variation had less influence on the result, and in a vibration frequency range, the influence of vibration became larger with the increase of frequency. This study can provide a reference for the application of phase change materials thermal control technology for airborne electronic equipment.