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

作　　者：黄丹青 王如根[1] 李仁康 胡加国 王思博 HUANG Danqing;WANG Rugen;LI Renkang;HU Jiaguo;WANG Sibo(Aeronautics Engineering College,Air Force Engineering University,Xi'an 710038,China)

机构地区：[1]空军工程大学航空工程学院,西安710038

出　　处：《空军工程大学学报（自然科学版）》2019年第1期20-25,共6页Journal of Air Force Engineering University(Natural Science Edition)

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。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 JBD’s layout only.

关 键 词：偏流板 侧转角 回流 飞机尾流 偏转角 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]