Investigation of heat transfer characteristics of aircraft icing under runback water

The heat transfer characteristics of aircraft icing process were investigated based on the theories of liquid-solid phase change and film flowing.The heat transfer model which coupled runback water flowing with liquid-solid phase change was established and the influence of airflow parameters on the characteristics of icing growth was analyzed.The results indicate that the runback water on the icing surface will accelerate the liquid-solid phase change and speed up the icing process.The shear stress caused by the airflow is the key factor to the runback water flowing.The higher the airflow speed,the greater the shear stress and stronger the runback water flowing becomes,and vice versa.Under the condition of runback water flowing,the speed and temperature of the airflow are the main causes affecting the icing accretion.The higher the airflow speed or the lower the temperature,the greater the icing rate will be.The liquid water content and the collection efficiency have weak effect on the icing rate comparatively.