本文针对一起典型的施瓦泽269型直升机做自转下滑训练时进入涡环状态的飞行事故进行分析研究。介绍了直升机涡环的形成机理，基于经典的高-辛判据方法计算得出施瓦泽269型直升机的涡环边界，并使用该型机对计算结果进行验证试飞，经综合分析最终确定了的涡环边界，为后续的特情飞行训练提供了技术保障。%Analysis and research of the typical Schweizer 269 helicopter lfight into the vortex ring state during auto-rotation in this paper. According to the aerodynamics ,vortex ring formation mechanism of the helicopter has been introduced in this paper, while based on the classic Gao-Xin criterion method, calculated the vortex ring boundary of Schweizer 269 helicopter, and verify the results in lfight use this type of helicopter, after a comprehensive analysis and ultimately determine vortex ring boundary of the type helicopter, for special situation lfight training of the type helicopter to provide technical support in the future.
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