Ice Shape Drag Correlations

"No certain explanation for the poor repeatability of glaze ice shapes is available at this time." NASA-TM-83556. Public Domain image from AEDC-TR-87-23. Summary We have seen several attempts to correlate drag for an airfoil with icing conditions. Here, we will review prior correlations, and refine the methods to achieve a better, more widely applicable correlation. Prior Correlations One significant correlation is from NASA-TM-83556 1, that used test control parameters such as total temperature, LWC, and airspeed: Public Domain image from NASA-TM-83556. Another is from AEDC-TR-87-23 2, which used the calculated leading edge freezing fraction (N): Public Domain image from AEDC-TR-87-23. About the lines on Figure 3, AEDC-TR-87-23 states: The curves for these figures were drawn as the author interpreted the data. The curves are similar in shape because of the functional dependency of N on test conditions that affect the change in ice shape and, thus, Cd. Again, it depends …