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。为验证该边界 ,进行了试飞验证工作 ,并得到了一些新的结论。综合试验研究、理论研究和试飞结果 ,提出了直升机下降飞行的“两线三区”的概念 ,使直升机涡环边界图更加合理 ,更为实用 Through the model rotor test, the reasonable helicopter vortex ring boundary criterion is obtained, and the boundary of the general vortex ring state of the helicopter is calculated. In order to verify this boundary, the flight test was carried out and some new conclusions were obtained. Based on the comprehensive experimental research, theoretical research and flight test results, the concept of “two lines and three zones” of helicopter descent flight is put forward to make the boundary of helicopter vortex ring more reasonable and practical