摘要
冰雹、冰块等外来异物被吸入进气道进而进入发动机,易导致发动机性能下降或者停车,威胁飞行安全,因此分析涡桨飞机进气道旁通道的排异特性具有重要意义。根据适航规范,针对两种常见外来异物--冰雹和冰块进行本体特性分析,确定其几何、质量以及初始姿态特性;通过计算流体力学(CFD)联合六自由度(6DOF)方法,对某国产新型涡桨支线飞机主发动机进气道中的外来异物运动排除特性进行数值模拟,进一步耦合LS-DYNA软件对排除中遇到的碰撞问题进行仿真分析。结果表明:一旦异物与壁面发生碰撞,碎裂成若干很小的碎块,能量损失,对发动机威胁较小,无论是进入主发动机或者旁通道,均可认为排除;但下壁面结冰区的冰块容易直接进入主发动机,有可能造成严重影响,需要重点关注。
Hail, ice and other foreign matters are sucked into the intake port and then enter the engine, which can easily lead the engine performance degradation or stop, threatening the flight safety. Therefore, it is of great significance to analyze the exhaust characteristics of the channel beside the intake port of turboprop aircraft. According to the airworthiness criterion, two kinds of foreign bodies, hail and ice, are analyzed to determine their geometry, mass and initial attitude. By means of CFD and 6 DOF method, the movement and exclusion characteristics of foreign bodies in the main engine inlet of a new turboprop regional aircraft are simulated. Further coupling the LS-DYNA software to simulate and analyze the collision problems encountered in the exclusion. A numerical simulation method for the removal of foreign matter from the intake port of turboprop engine is established. The results show that once the foreign body collides with the wall, it will break up into some small pieces. The energy loss is less threatening to the engine. Whether it enters the main engine or the side channel, it can be considered to be eliminated;However, the ice in the ice area of the lower wall is likely to enter the main engine directly, which may cause serious impact, so it needs to be focused on.
作者
王利敏
张彦军
米百刚
杨梅花
WANG Limin;ZHANG Yanjun;MI Baigang;YANG Meihua(Institute of General Aerodynamics,AVIC The First Aircraft Institute,Xi’an 710089,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China;Beijing Goldwind Science&Creation Windpower Equipment Co.,Ltd.,Beijing 100176,China)
出处
《航空工程进展》
CSCD
2020年第2期264-271,278,共9页
Advances in Aeronautical Science and Engineering
关键词
涡桨发动机
外来异物
冰雹
冰块
进气道
旁通道
数值模拟
turboprop engine
foreign objects
hail
ice cube
engine inlet
bypass duct
numerical simulation
