The results show that the interaction between a viscous vortex ring and a free surface is different from the inviscid one.
结果表明:由于粘性的存在,使得涡环与自由表面的相互作用与无粘情形相比有许多不同。
Physically, at a special critical wave speed the flow may have a naturally periodical separated-reattached pattern, with each wave trough capturing a stable vortex ring.
物理上看,在一个特定的临界行波速下会形成自发的周期性分离再附流,每个波谷的分离区捕获一个稳定的涡环。
A reasonable criterion of vortex ring state boundary for helicopter is acquired based on model rotor tests.
通过模型旋翼试验得到了合理的直升机涡环边界判据,并由此计算得到了直升机通用涡环状态边界。
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