粒子法を用いた液膜を有する壁面に対する氷粒子斜め衝突の数値的研究

抄録

Ice crystal icing is a phenomenon that occurs in warm tropical regions and causes engine power loss. In this study, we perform numerical simulations of ice particle impact on a wall with liquid water film at multiple impact angles using the particle method to improve the prediction accuracy of ice crystal icing. In the numerical simulations, the particle method was used, which can easily reproduce large deformations at the interface. The MPS method and the E-MPS method were used for ice particles and liquid film particles, respectively, and each phase interacts through the surface tension, viscous forces, and pressure. The numerical simulations reproduced the attenuation of the tangential coefficient of repulsion due to the presence or absence of a liquid film and showed that the coefficient of repulsion decreased at a smaller angle of attack. Under high-speed conditions, the breakup behavior of ice particles was observed to change with varying the impact angle.