航行体头型对气泡附着影响的数值研究

水下航行体穿越水中膨胀气泡时,气泡在一定条件下有可能附着在航行体上形成附着空泡,从而改变航行体水动力性能,为此开展了头型因素对气团附着空泡影响的数值研究。利用数值模拟方法计算了四种头型航行体穿越膨胀气团的过程,结果发现头型是影响气泡附着的重要因素:对于分离角较大的钝头型,气泡容易附着在航行体上形成附着空泡;对于分离角较小的细长头型,气泡受到扰动后就很快与航行体分离而不会附着。

Numerical simulation on underwater vehicles of different head nose crossing through gas bubble

When an underwater projectile passes through a distent bubble, the bubble would be attached to the underwater projectile and becomes its cavity under certain conditions, changing the hydrodynamic per-formance eventually. In order to find out the mechanism of the cavity attaching, a numerical study on the projectiles with different nose is carried out. From the simulation, it is found that the nose shape has a large effect on the attachment. For easy cavitating blunt nose, the bubble is easy to attach and vice versa. The study can help to predict the possible attachment of the bubble, the contents inside the cavity and hydrody-namic forces.