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涡环状态是直升机在下降或下滑飞行阶段一种固有的危及飞行安全的危险状态。它会导致直升机操纵失灵,在颠簸下跌中坠地失事,在我国也发生过多起这类事故,因而涡环边界的确定是保证直升机飞行安全的重要措施。本文介绍了国外直升机涡环状态及其边界的理论和试验研究现状,并重点介绍了我国对此问题的研究和我国学者如何通过模型试验及理论计算,结合飞行试验,得到了比国外的研究更为实用的直升机涡环状态边界的情况
The vortex ring state is an inherent dangerous state endangering flight safety during the descending or the downward flight of a helicopter. It will cause the malfunction of helicopter, fall accidentally in bumpy fall and too many accidents in our country. Therefore, the determination of vortex ring boundary is an important measure to ensure the helicopter flight safety. This paper introduces the theory and experimental research status of foreign helicopter vortex ring state and its boundary, and emphatically introduces our country’s research on this issue and how Chinese scholars through model test and theoretical calculation, combined with flight test, get more than foreign research For the practical helicopter vortex ring state boundary situation