... 涡迹 vortex trail 涡环状态 vortex ring state 涡桨式强制式混凝土搅拌机 forced action concrete mixer ...
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To predict helicopter vortex ring state boundary is necessary for flight safety.
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。
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。
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.
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。
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