空气动力学学报2018，Vol.36Issue(1)：31-34,4.DOI:10.7638/kqdlxxb-2015.0203
基于桨盘倾角的直升机涡环状态边界修正计算方法
Revised calculation method for helicopter vortex-ring state boundary based on flight attitude
马鸿儒 1穆志韬 1李洪伟 1孙文胜1
作者信息
- 1. 海军航空工程学院青岛校区,山东青岛 266041
- 折叠
摘要
Abstract
Vortex ring state (VRS) is hazardous for helicopter flight,which can cause the vehicle being out of control in some cases.It is important to accurately predict the occasion when helicopter getting into this dangerous state,called vortex ring boundary.The currently existing calculation model for the boundary is considerably precise but still has error being compared with flight test data.Firstly,glide angles of helicopter in model test and real flight were compared to find out that panel obliquity is the main factor to cause the inaccuracy of ideal vortex-ring boundary.The trend of helicopter attitudes with forward speed increase was analysed in helicopter inclined descent.The calculation model of rotor vortex ring boundary was found in consideration of panel obliquity.Based on helicopter balance equation and Gao-Xin criterion,the algorithm vortex-ring state boundary for real flight was pointed out,in which the panel obliquity was reckoned in.Then,being taken for instance,the revised boundary curve of a helicopter was numerically figured out.Finally,the calculation results were verified and analyzed in contrast with flight test data.Results show that,the revised vortex ring boundary curve for real flight is located below the ideal one,which has a more favorable agreement with flight test data.Thus,panel obliquity has high influence on rotor VRS boundary.On account of the difference in panel obliquity with different helicopter,however,the level of the influence also depends on the helicopter type.关键词
直升机/涡环状态/判据/桨盘倾角Key words
helicopter/vortex-ring state (VRS)/criterion/panel obliquity分类
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马鸿儒,穆志韬,李洪伟,孙文胜..基于桨盘倾角的直升机涡环状态边界修正计算方法[J].空气动力学学报,2018,36(1):31-34,4.
