石墨烯涂层对直升机旋翼防/除冰组件传热的影响

采用水性和油性石墨烯涂层对复合材料防/除冰组件进行测温及防/除冰实验。针对直升机旋翼对结冰的敏感等特点，提出了旋翼防/除冰组件包铁表面涂覆石墨烯涂层改性传热性能的方法，从而提高旋翼防/除冰组件除冰效率。为验证石墨烯涂层对防/除冰组件传热效率具有显著的提高作用，采用搭建的除冰实验平台并对涂覆的旋翼防/除冰组件进行传热实验及除冰实验。结果表明，石墨烯涂层对提高防/除冰组件的传热性能具有显著作用。同时，采用油性石墨烯涂层和水性石墨烯涂层分别进行传热测试，研究表明油性石墨烯涂层升温速率高于水性石墨烯涂层，且油性石墨烯涂层平均传热速率为0.021℃/s，瞬时最大传热速率为0.083℃/s，均高于水性石墨烯涂层，说明油性石墨烯涂层的防/除冰效果优于水性石墨烯。最后，通过改变喷涂工艺控制石墨烯涂层厚度进行研究，研究发现随着石墨烯涂层厚度的增加，涂层的导热系数逐渐减小，该实验结果验证了Balandin等推导的热导率公式中石墨烯热导率与片层厚度之间的反比例关系。 

Effect of graphene coating on heat transfer of anti-/deicing component for helicopter rotor

The temperature measurements and anti-/deicing experiments of the composite anti-/deicing component were performed with water-based and oil-based graphene coating.In view of the sensitivity of helicopter rotor to icing,a method of modifying the heat transfer performance of rotor anti-/deicing component with graphene coating on the iron surface was proposed to improve the efficiency of anti-/deicing component.In order to verify the effect of graphene coating on the heat transfer efficiency,the temperature measurements and deicing experiments of the coated rotor anti-/deicing components were carried out on the deicing experimental platform.The experimental results show that the graphene coating has a significant effect on improving the heat transfer performance of anti-/deicing component.Meanwhile,the heat transfer of oil-based graphene coating and water-based graphene coating were tested respectively.The results show that the temperature rise rate of oil-based graphene coating is higher than that of water-based graphene coating,and the average heat transfer rate of oil-based graphene coating is 0.021℃/s,the instantaneous maximum heat transfer rate is 0.083℃/s,which are higher than that of water-based graphene coating.The results indicate that the anti-/deicing effect of oil-based graphene coating is better than that of water-based graphene coating.Finally,by changing the spraying process to control the thickness of graphene coating,it is found that with the increasing of the thickness of graphene coating,the thermal conductivity of the coating gradually decreases.The experimental results verify the inverse proportion relationship between the thermal conductivity of graphene coating and the thickness of the sheet in the thermal conductivity formula deduced by Balandin et al.