[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] 不同偏流板侧转角对回流的影响规律- The Effect of Different Vertical Angle on Back Flow of the Jet Blast Deflector
文章摘要
黄丹青,王如根,李仁康,胡加国,王思博.不同偏流板侧转角对回流的影响规律[J].空军工程大学学报:自然科学版,2019,20(1):20-25
不同偏流板侧转角对回流的影响规律
The Effect of Different Vertical Angle on Back Flow of the Jet Blast Deflector
  
DOI:
中文关键词: 偏流板  侧转角  回流  飞机尾流  偏转角
英文关键词: deflector  vertical angle  back flow  engine wake  deflection angle
基金项目:
作者单位
黄丹青,王如根,李仁康,胡加国,王思博 空军工程大学航空工程学院,西安,710038 
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中文摘要:
      偏流板将飞机发动机尾流导向,防止尾流烧蚀地面或损坏周围设备和建筑,但是偏流板会产生回流,不利于发动机正常工作。以简化发动机模型和偏流板为对象,研究了双发飞机起飞时偏流板侧转角对回流的影响。结果发现侧转角较大时,近地面回流到达发动机尾流下方时,由于主流引射作用会向发动机外侧发生第一次偏转,侧转角越大,偏转越明显;存在一个临界侧转角6°,小于6°时,回流第一次偏转后沿着发动机下侧向前流动,易被进气道吸入;大于6°后,近地面回流一次偏转后会向发动机的外侧进一步偏转,最后向后流动,不会被进气道吸入。同时,随着侧转角增大,更多的高温尾气回流向一侧偏转,有利于另一侧人员和设备的安全。
英文摘要:
      Although the jet blast deflector (JBD) can change the direction of the engine wake to the upward, and prevent the deck from being ablated and protected the equipment behind the aircraft, the back flow generated from JBD is unfavorable to the engine. In this paper, the characteristics of the back flow based on the vertical angle of 0°, 2°, 4°, 6°, 8°, 10°and 12° are investigated. The results indicate that the back flow would change the direction to the outward under the wake flow. If the JBD vertical angle is less than the critical angle 6°, the back flow would flow along the engine and be easily drawn into the air inlet. Or the back flow would remain changing direction to the outward, even to the backward, avoiding the back flow drawn into the air inlet. These are for reference of the layout only.
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