Dynamic Behavior and Heat Transfer Characteristics of Non‑spherical Ice Crystals in High‑Temperature Air Flow

This study investigates the dynamic behavior and heat transfer of ice crystals in high-temperature air flow after being ingested by an aero-engine. A numerical model under the Lagrange framework is built to simulate ice crystal motion，heat and mass transfer. Different ice crystal melting models and ice crystals with various shapes and sizes are also compared. The results show that when using the“naked”ice particle model，it takes longer to completely melt compared with the water cover model. It takes 0.04 s for a 20 μm particle to melt，but the melting rate of a“naked”ice particle is faster before 0.023 s. Under the same condition，the liquid water content of a spherical ice crystal is high，and that of a 20 μm spherical one is 49.05% at the outlet. The liquid water contents of ellipsoidal and hexagonal plate ice crystals are close，which are roughly 40% at the outlet. The smaller the size，the earlier the crystals start to melt，and the higher the liquid water content of the crystals. The liquid water content is 60.4% of a 20 μm ice crystal and only 15.5% of a 40 μm one at the outlet.