绕Hydronautics水翼超空化的发展及其形态特征

为深入了解超空化流动机理,采用高速录像和图像处理技术,观测了绕Hydronautics水翼的超空化流动形态. 结果表明,超空化的发展经历了空穴形成、两相共存和完全发展3个阶段. 空穴开始形成时,空化区域充满了均匀分布的水、汽混合介质,空穴尾部处于不稳定状态;两相共存阶段,临近水翼区域形成透明的纯汽相区,空化区域后部仍是水汽混合的两相区;在完全发展阶段,汽相区已经占据了空化区域的绝大部分,水汽混合区呈窄带状分布,整个流场已基本处于准稳定状态.

Observation of Supercavitation Aspects Around a Hydronautics Foil

Aspects of supercavitation flow around a Hydronautics foil were observed by means of a high-speed video camera and analysed by picture-processing. The results showed that the development of supercavitation evolved in three stages: cavity formation, coexistence of two phases, and the fully developed phase with high vapor concentration. Firstly, mixtures of water and vapor are full of cavitation areas along with vortex shedding and tail fluctuating. Secondly, as the vapor phase coexists with water/vapor mixed phase, a transparent vapor area appears near the foreside of the cavity, although the mixture still filled the rear part. And finally, a cavity largely filled with vapor appeared with a two-phase tail, the whole flowing field attained a sub-stable state.