Numerical analysis of a microjet-based method for active flow control in convergent-divergent nozzles with a sudden expansion duct

• Main Authors: Abid, Abdul, Khan, Sher Afghan, Baig, Muneer
• Format: Article
• Language: English
• Published: Tech Science Press 2022
• Subjects: N Fine Arts; TL Motor vehicles. Aeronautics. Astronautics
• Online Access: http://irep.iium.edu.my/98287/7/98287_Numerical%20analysis%20of%20a%20microjet-based%20method.pdf; http://irep.iium.edu.my/98287/; https://www.techscience.com/fdmp/online/detail/18688/pdf; https://www.techscience.com/fdmp/online/detail/18688

A method based on microjets is implemented to control the flow properties in a convergent-divergent nozzle undergoing a sudden expansion. Three different variants of this active control technique are explored numerically by means of a finite-volume method for compressible fluid flow: with the first one, the control is implemented at the base, with the second at the wall, while the third one may be regarded as a combination of the other two variants. When the jets are over-expanded, the control is not very effective. However, when a favorable pressure gradient is established at the nozzle, the control becomes effective, leading to an increase in the base pressure.