对流换热对覆冰导线高频融冰温度分布的影响

Effect of convective heat transfer on temperature distribution of high-frequency excitation deicing for ice-covered wires

根据流体力学的基本原理,应用有限元分析软件ANSYS建立覆冰导线高频融冰时的外流场模型,得到覆冰导线高频融冰时的周围空气流场、压力场分布规律及覆冰导线表面对流换热差异性。分析了高频融冰过程中的热量损失和对流换热的影响因素,通过电磁与热分析,揭示了高频激励融冰过程呈不均匀非对称融冰规律,覆冰导线迎风侧压力大、温度低,背风侧压力小、温度高,表明不均匀对流换热使覆冰导线背风侧先融化,迎风侧后融化。在环境温度和覆冰厚度一定的条件下,覆冰导线外表面温度随对流换热系数的增大而降低。

According to the basic principles of fluid mechanics,the external flow field model of high-frequency excitation deicing of ice-covered wire was established by the finite element analysis software ANSYS.The distribution law of surrounding air flow field,and pressure field and the difference of convective heat transfer on the surface of the ice-covered wire were obtained during high-frequency excitation deicing of ice-covered wire.The influencing factors of heat loss and convective heat transfer were analyzed during high-frequency excitation deicing.The electromagnetic and thermal analysis are carried out using the finite element software ANSYS,which reveals that the process of high-frequency excitation ice-melting process is uneven and asymmetric ice-melting.The pressure on the windward side is large,the temperature is low,the pressure on the leeward side is small,and the temperature is high,which indicates that the uneven convective heat transfer makes the leeward side of the ice-covered wire firstly melt,and then,melt towards the windward side.Under the conditions of constant ambient temperature and ice thickness,the external surface temperature of the ice-covered wire decreases with the increase of the convective heat transfer coefficient.