B-18 ファン動翼における着氷現象の数値シミュレーション(空力・CFD,一般講演)

概要

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Ice accretion is a phenomenon where super-cooled water droplets impinge and accrete on a body. It is a complex phenomenon composed of fluid dynamics and heat transfer problems. Ice accretion on the leading edge of airfoils, the intake of engines and so on causes performance degradation. On a jet engine fan, ice accretion disturbs the inlet flow, and engines cannot work normally, and separated ice pieces may cause serious damage to the fan. Experimental investigations are very difficult, because it is not easy to set the accretion conditions repeatedly in a wind tunnel. Therefore, it is expected that CFD will be a useful way to predict the ice accretion phenomenon. In the present study, we simulated the ice accretion process for a three-dimensional fan rotor to clarify how the engine operation conditions (cruising and climb-up conditions) affect the ice accretion of the fan. Following insights were obtained through the present study. Thick ice forms on the hub side, the thickness gets thinner with increasing the radial location. The amount of ice is larger on the cruising condition, but the maximum thickness is larger on the climb-up condition.
公益社団法人日本ガスタービン学会の論文
2009-10-21