[author_cn_name].[cn_title][J].空军工程大学学报:自然科学版,[year_id],[volume]([issue]):[start_page]-[end_page] 某型直升机异常离地状态的尾桨涡环特性分析- An Analysis of Characteristics of Tail Rotor Vortex Ring in an Abnormal Lift off State for a Certain Type of Helicopter
文章摘要
费景荣.某型直升机异常离地状态的尾桨涡环特性分析[J].空军工程大学学报:自然科学版,2022,23(1):79-82
某型直升机异常离地状态的尾桨涡环特性分析
An Analysis of Characteristics of Tail Rotor Vortex Ring in an Abnormal Lift off State for a Certain Type of Helicopter
  
DOI:
中文关键词: 直升机尾桨小拉力状态  尾桨涡环  异常离地  加快旋转  飞行安全
英文关键词: ull state of helicopter tail rotor  tail rotor vortex ring  abnormal off ground  acceleration fast turning  flight safety
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作者单位
费景荣 海军航空大学航空基础学院 山东烟台 264001 
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中文摘要:
      为弄清某型直升机连续发生的两起异常离地后加速快转事故的原因,根据直升机尾桨涡环的机理,结合事故直升机的状态特点,进行了计算、分析,有关参数计算结果与事故直升机飞参记录的数据一致。研究表明,由于该型机在地面处于尾桨小拉力状态时,进入尾桨涡环的临界偏转角速度小,因而异常离地时一旦意外偏转,尾桨涡环易进、难改,即尾桨涡环特性显著变差。经分析,提出了相关应对措施,有利于提高该型机的起降安全水平。研究结论对其他类似机型也有参考价值。
英文摘要:
      In order to find out the causes of two abnormal lift off acceleration fast turning accidents occurring in succession, according to the mechanism of the helicopter tail rotor vortex ring, combination with the state characteristics of the accident helicopter, the calculation and analysis of the tail rotor vortex ring characteristics are carried out, and the results of the parameter calculation are consistent with the data recorded by the accident helicopter. The research result shows that this type helicopter being in the small pull state of the tail rotor on the ground, and the critical deflection angle speed of the corresponding tail rotor vortex ring being small, once an unexpected deflection occurs to the abnormal lift off, there is in a situation of easily entering into the tail rotor vortex ring state and hardly changing out , i.e. the characteristics of the tail rotor vortex ring going from bad to worse. After analysis, the relevant measures are put forward to improve the safety level of this type helicopter take off and landing. The findings also refer to other similar helicopter.
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