超空化发展初始阶段通气空化非定常流动特性研究

Research on Nonsteady Flow Characteristics of Ventilated Supercavitation in Initial Development Stage

摘要:

为了进一步了解通气超空化发展初始阶段的流动特性,采用实验与数值计算的方法对绕锥头回转体通气超空化发展初始阶段的流场结构进行研究。 结果表明:反向射流使附着在回转体肩部的透明空泡破灭,在反向射流与通气气体共同作用下,附着空泡内部形成一个大尺度旋涡结构,此旋涡结构与主流相互作用逐渐分裂成多个小尺度的旋涡结构,最终形成脱落空化涡。

Abstract:

To understand the flow characteristics of ventilated supercavitation in the initial development stage, the flow filed structure of ventilated supercavitation around axisymmetric body in the initial development stage is researched by the experimental and numerical calculation methods. The results show that the backward jet make the transparent cavitation attached to axisymmetric body’s shoulder busted. A large scale vortex structure in the ventilated cavitation is formed by the interaction between backward jet and cavity air, and the vortex structure and mainstream experience interactions and split into some small scale vortexes. In the end, the shedding bubble vortex is formed.