### 亚声速武器舱空腔流动压力特性及其控制方法

1. 航空工业第一飞机设计研究院, 西安 710089
• 收稿日期:2020-03-11 修回日期:2020-03-30 出版日期:2020-11-15 发布日期:2020-05-11
• 通讯作者: 张彦军 E-mail:zhangyanjun_fai@163.com

### Cavity flow pressure characteristics and flow control methods of subsonic weapon bay

XIE Lu, ZHANG Yanjun, HOU Yinzhu, LIU Wei, LEI Wutao

1. AVIC the First Aircraft Institute, Xi'an 710089, China
• Received:2020-03-11 Revised:2020-03-30 Online:2020-11-15 Published:2020-05-11

Abstract: The static and fluctuating pressure characteristics of cavity flow in a weapon bay were tested in a high speed wind tunnel, and the flow control method with perforated plate or injection which was added to the leading edge of the cavity was studied with changing parameters. The test Mach number 0.75, cavity length 300 mm, length-to-depth ratio 3, and width-to-depth ratio 1. Experimental results showed that on the ceiling of the cavity and along the flow direction, the pressure distribution is relatively uniform. The spectra for different monitor points showed the same modal characteristics, which is typical of open cavity flow and is barely affected by the change of angle of attack within a certain range. At the typical flight angle of attack, the flow control method of the leading-edge perforated plate can improve the pressure distribution along the flow direction and reduce the fluctuating pressure in the cavity. The installation height and the span-wise length of the perforated plate have a significant impact on the flow control effect. Within certain range, the combination of large installation height and small span-wise length has a better flow control effect on the perforated plate, which can also work steadily at different angles of attack. At the typical flight angle of attack, the flow control method of leading-edge injection can also improve the pressure distribution along the flow direction and reduce the fluctuating pressure in the cavity. The jet slot width and the jet flow rate have a significant impact on the flow control effect. Within certain range, the combination of small span-wise width and large jet flow rate has a better flow control effect on the leading-edge injection, which can also work steadily at different angles of attack.