AN OBSERVATION OF PRESSURE WAVES AROUND A SHALLOW CAVITY

✍ Scribed by X. Zhang; A. Rona; J.A. Edwards

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 875 KB
• Volume: 214
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1998.1635

✦ Synopsis

A study was performed on supersonic flow over a shallow cavity at Mach 1•5, by using model tests and computational fluid dynamics. Flow visualization techniques including spark schlieren and computational schlieren were employed to identify wave patterns around the cavity and provide insight into major flow physics. The study identified five types of shock/pressure waves around the cavity. In particular, downstream convecting pressure waves associated with large vortices in the driving shear layer were observed. This class of waves has not been reported previously in the open literature. Results suggest that the shear layer is dominated by a coupled motion of flapping in the transverse direction due to the shear layer instability and vortex convection in the streamwise direction due to the non-linear propagation effects leading to significant wave steepening with convection.