摘要
从飞行试验角度介绍了直升机垂直下降飞行时的旋翼涡环特性,从空气动力学角度探讨了涡环形成的机理,分析了Wolkovitch判据、Peters判据以及高-辛判据等三种涡环判据的优点和不足。以直升机做放距阶跃飞行试验为例,得出了为避免直升机进入涡环的安全措施,并验证了高-辛判据的准确性和工程实用性。
A method of the helicopter rotor vortex ring in vertical flight has been introduced in this paper.Wolkovitch criterion,Peters criterion and Gao-Xin criterion for the votor vortex ring characteristics are compared with,and their advantages and disadvantages for these criteria are investigated.As a kind of helicopter＇s collective dropping step flight test for example,some useful conclusion of flight safety are obtained.The analysis shows that the Gao-Xin criterion is consistent with the result of flight test.
出处
《飞行力学》
CSCD
北大核心
2010年第4期82-84,共3页
Flight Dynamics
关键词
直升机
飞行试验
涡环
helicopter
flight test
vortex ring
