对直升机涡环特性及处置的探讨

根据国内外有关的理论，实验和试飞结果，简要分析了涡环状态的形成和特性及其对直升机飞行安全的影响，并以此为基础，结合一例飞行事故，重点探讨了改出涡环状态的第一处置动作，分析表明，不宜把上提总距杆作为改出涡杆（尤其是典型环状态）的第一处置动作；在安全高度以上，以顶杆增速作为改出涡环的第一处置动作更为有利。

The Discussion of Characteristic and Treatment on Helicopter's Vortic Ring State

Vortic ring state does great harm to the flying safety of helicopter. According to the concerned theory as well as the result of experiment and flight test at home and abroad,this paper analyzed the formation and characteristic of vortic ring state in brief.Then refering to a flying accident, research mainly the first control for recovering form vortic ring state. The conclusion is that it is not proper to take raisng the collective pitch as the first control for recovering form vortic ring state(especially in typical vortic ring state),and above the safe height it is benefical to take pushing the stick forward for increasing speed as the first control.