Abstract: Mastering the heat transfer characteristics of composite blade shell is important to realize the aerothermal anti-icing and deicing of the wind turbine blade. The three heat transfer models of the blade shell are constructed by choosing three local positions, including the spar cap,leading edge and trailing edge, based on the analysis of the heat transfer theory of the aerothermal method for composite blades, and then different load temperatures are imposed on these models to verify heat transfer simulation, respectively. The simulation analysis shows that the heat transfer characteristics of each model are consistent under different load temperatures. The heat transfer process of the leading edge model and trailing edge model is slower and the temperature drop gradient is maximum because of the different sandwich materials and thickness, while the spar cap model is faster and reaches the equilibrium state after 2 h. The field heat transfer test of 2 MW blade was carried and the temperature change trend at the monitoring point of the leading edge is close to the analysis of the corresponding heat transfer model, and the heat transfer simulation and test results show that the Δ10 ℃ temperature rise on the blade surface after heating for 1.5 h can satisfy the engineering application requirements of composite blade anti-icing and deicing.

Key words: composite blade, heat transfer characteristics, anti-icing and deicing, heat transfer simulation, load temperature