Numerical Investigation of Heat and Mass Transfer on an Anti-Icing Inlet Cone

摘要

The heat and mass transfer on the inlet cone surface of an aeroengine with hot-air film anti-icing is studied numerically. Heat and mass transfer during supercooled droplets' movements are considered, and a modified Lagrangian approach is applied to calculate the droplets' impingements on the cone surface. A thermal balance model is applied to solve the surface temperature distribution on the cone with the consideration of water runback. Comparison of the computation results and the test data shows that the current model is more accurate. Droplet size reduces very slightly due to the evaporation during its movement, but the evaporation causes droplet temperature to decrease obviously and even decreases the temperature to be lower than that of the airflow. Hot-air film makes droplet temperature increase and changes the direction of droplet movement near the cone leading edge. Larger mass rate of hot air leads to smaller local collection efficiency on the cone surface near the hot-air jet. The heat flux of heating the droplets is relatively higher than the evaporation heat flux because the surface temperature of the hot-air film anti-icing cone is normally not very high.