Transient characteristics of an electrothermal anti-icing process based on the improved messinger model

An unsteady numerical study on the electrothermal anti-icing process of an aeroengine rotating fairing was performed. The water droplets impingement was firstly simulated based on the Eulerian theory for two-phase flow. Then the calculation method of the convection heat transfer on the fairing surface was proposed and the corresponding code for anti-icing calculation was developed based on the improved Messinger model. The model and method were validated by comparing the present results with those obtained by FLUENT or FENSAP-ICE. System start-up characteristics and effects of rotation were investigated and different heating strategies were compared subsequently. The analysis indicates that rotation can enhance convection heat transfer on the fairing surface; icing and ice shedding phenomenon may appear during the system start-up stage and the response time of the system can be reduced by considering these phenomena; besides, the periodic anti-icing is more energy-efficient compared to the continuous heating when the heating power supply is the same, while when the same energy is consumed by the two patterns, the periodic system shows faster start-up response, but faces the greater risk of icing.