E211 NACA0015翼形まわりのクラウドキャビテーションの崩壊機構に関する数値解析(E-21 高速液体噴流・キャビテーション,一般講演)

概要

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It has been well known that cloud cavity has U-shaped structure by experiments. However, there are few previous research about that structure in the field of numerical analysis. Therefore, in this study, the collapsing mechanism of cloud cavitation is analyzed in detail through the simulations of three-dimensional cavitating flows around a NACA0015 hydrofoil. A locally homogeneous model is used for the gas-liquid two-phase medium, and the compressible Navier-Stokes equations along with the mass transfer equation of the vapor are solved. As a result, it become clear that U-shaped structure is caused by re-entrant jet toward the mid-span direction from the sidewall. In addition, mean lift coefficient and Strouhal number result different value from without sidewall to with sidewall. It indicates that unsteady characteristics of cavitating hydrofoil are affected by the structure of cloud cavitation.
2004-08-09