针对直升机特有的涡环飞行状态，根据直升机空气动力学理论，分析了直升机涡环状态飞行事故的现象及成因。
To investigate helicopter vortex-ring state, the phenomenon and reason of helicopter vortex-ring state flight accident is analyzed from the view of helicopter aerodynamics.
英莫尔曼翻转：飞机的一种特技动作，先完成半个环状，然后再完成半个翻滚以获得高度并同时改变飞行方向。
A maneuver in which an airplane first completes half a loop and then half a roll in order to gain altitude and change flight direction simultaneously.
直升机涡环状态边界的确定对直升机飞行安全具有重要意义。
To predict helicopter vortex ring state boundary is necessary for flight safety.
应用推荐