通气空泡内部流场结构实验研究

Experimental research of inner flow field structure for ventilated cavity

采用人工通气的办法在水下航行体表面生成通气超空泡可以大幅降低水下航行阻力。保持通气空泡的形态稳定是保证航行体水下流体动力稳定的前提,因此需要了解通气空泡内部气体流动结构及其与空泡泄气方式的相互影响规律。该文建立了通气空泡内部流场结构的实验测量装置,并运用PIV(粒子成像测速)方法对通气超空泡内流场结构进行了测量,归纳了通气空泡三种典型的内部流场结构形式及其成因,并给出了泡内气流流速的变化趋势。

Ventilated cavity can greatly decrease the drag of an underwater navigating vehicle. It is importantto maintain the shape of the ventilated cavity to be steady. Thus the inner flow structure of the cavity andits interaction with the gas leakage pattern need to be investigated. In this paper, the inner gas flow fieldstructure of the ventilated cavity induced by a flat plate was studied by the PIV （Particle Image Velocimetry）method. Three typical types of the inner flow field structure were concluded. The velocity tendency ofthe gas flow was also given.