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Son, C.,Yee, K. American Institute of Aeronautics and Astronautics 2018 Journal of aircraft Vol. No.
<P>To ensure flight safety and expand the availability of high-altitude long-endurance aircraft, the present study suggests a novel procedure for determining mission success or failure under icing conditions. First, the ice accretion shapes during the climbing stage are predicted under icing conditions using the one-shot method. Then, the total ice mass on the high-altitude long-endurance aircraft surface and the resulting aerodynamic performance is numerically calculated. Subsequently, metamodels are constructed to correlate meteorological parameters and aerodynamic performance. Finally, the total required power to reach the mission altitude is compared with the onboard battery capacity to make a quantitative judgment about mission success. The proposed procedure is applied to the EAV-2H+, with a maximum takeoff weight of 20 kg, developed by Korea Aerospace Research Institute. The results show that, when the liquid water content is 0.3-0.6 g/m(3) and median volumetric droplet diameter is below 18 mu m, the battery margin falls below 10%, implying that particular attention is required when operating the aircraft under those meteorological conditions. Second, when using the one-shot method to predict ice shapes, the flight speed of aircraft and air density should be taken at a midpoint altitude between the ground and the highest altitude at which droplets exist. Finally, due to the low flight speed of aircraft, only a small number of water droplets adhere to the surface, and there is little convective heat transfer, resulting in rime ice shapes even at high temperatures.</P>