An icing scaling parameter with the effects of phase change time

The icing wind tunnel test is the main method for the aircraft icing research.The icing scaling law is the theoretical foundation of an icing wind tunnel test.To overcome the disad-vantage of current icing scaling method in glaze and mixing ice simulation,a new scaling parame-ter,CT,is proposed in this paper based on the analysis of heat transfer in icing process.This pa-rameter differs significantly from the scaling parameters originated from Messinger’s thermody-namic model for it take the effects of the phase change time into account.Introducing CT into the traditional scaling law can effectively avoid the randomness in selecting the test pressure and speed.The new parameter has been evaluated with numerical method based on the NACA0012 airfoil and a supercritical airfoil.The results show that on the two airfoils,both the ice shapes and the droplet collection efficiency under the reference icing conditions agree with those under the selected test conditions,which indicates that the parameter is feasible.The research work has good reference value for improving the accuracy of experimental simulation of glaze or mixing ice.