进气道进口导流板的工作机理

WORKING PRINCIPLES OF INTAKE FENCES

在低速情况下进行了进气道安装进口导流板的研究。文中用实验阐明了进气道处于大攻角下进口导流板能有效的降低其出口稳态和动态畸变,并能提高其总压恢复。文中进一步说明了进口平直段内避风侧壁面上的气流分离与出口流场的关系,提出了导流板改善气流分离的机理,并用所提出的装导流板后的流动模型进行了分析和推断。文中论述了导流板设计参数对进气道性能的影响。本文内容对设计进气道进口导流板具有参考意义。

Air intake with fences installed at the entrance is investigated at low speed. With fences at a high angle of attack the steady and dynamic distortions are effectively reduced and the total pressure recovery is increased at the exit.These improvements are shown to be closely related to the reduced extent of separation along leeward wall of the intake by the fences at the angle of attack. A flow model is suggested to describe the flow in the channels formed by the fences. With this model in mind, the mechanism of the fences can be easily imagined and the performance of the slanted inlet with fences can be predicted. The effects of the position, lengths and the number of the fences on the performance of the inlet are investigated. The difference between a slanted and a pilot inlet both with fences are compared and an intake with an S-duct and fences are evaluated. Combined with less radar reflection the multi-channel inlet is shown to be attractive. The above related investigation will be helpful in intake fence design.