Large-eddy simulation of shock-wave/turbulent boundary layer interaction with and without SparkJet control

详细信息    查看全文

• 作者：Guang Yang^a ; ^{g.y_1990@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Yufeng Yao^b ; ^{Yufeng.Yao@uwe.ac.uk" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Jian Fang^a ; ^c ; ^{fangjian@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Tian Gan^a ; Qiushi Li^a ; Lipeng Lu^a
• 关键词：Large-eddy simulation ; Shock-wave ; Turbulent boundary layer ; Interaction ; SparkJet control
• 刊名：Chinese Journal of Aeronautics
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：29
• 期：3
• 页码：617-629
• 全文大小：3982 K

文摘

The efficiency and mechanism of an active control device “SparkJet” and its application in shock-induced separation control are studied using large-eddy simulation in this paper. The base flow is the interaction of an oblique shock-wave generated by 8° wedge and a spatially-developing Ma = 2.3 turbulent boundary layer. The Reynolds number based on the incoming flow property and the boundary layer displacement thickness at the impinging point without shock-wave is 20000. The detailed numerical approaches were presented. The inflow turbulence was generated using the digital filter method to avoid artificial temporal or streamwise periodicity. The numerical results including velocity profile, Reynolds stress profile, skin friction, and wall pressure were systematically validated against the available wind tunnel particle image velocimetry (PIV) measurements of the same flow condition. Further study on the control of flow separation due to the strong shock-viscous interaction using an active control actuator “SparkJet” was conducted. The single-pulsed characteristic of the device was obtained and compared with the experiment. Both instantaneous and time-averaged flow fields have shown that the jet flow issuing from the actuator cavity enhances the flow mixing inside the boundary layer, making the boundary layer more resistant to flow separation. Skin friction coefficient distribution shows that the separation bubble length is reduced by about 35% with control exerted.