图5. 绕NACA66水翼非定常云状空穴结构演化过程 (空穴含汽率$\alpha_{\rm v} >0.15$,周期$T_{\rm cycle} = 66$ ms)
Fig. 5. The numerically predicted vapor fraction ($\alpha _{\rm v} >0.15$) of cavitation pattern around a NACA66 hydrofoil ($T_{\rm cycle} = 66$ ms)