Shock-induced dual-layer evolution. (25th December 2021)

• Record Type: Journal Article
• Authors: Liang, Yu; Luo, Xisheng
• Is Part Of: Journal of fluid mechanics. Volume 929(2021)
• Publication Date: 2021-12-25
• Subjects: shock waves; Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2021.903
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract: Abstract : Shock-induced fluid-layer evolution has attracted much attention but remains a challenge mainly because the coupling between layers remains unknown. Linear solutions are first derived to quantify the layer-coupling effect on the shocked dual-layer evolution. Next, the motions of the waves and interfaces of a dual layer are examined based on the one-dimensional gas dynamics theory. Shock-tube experiments on the dual-layer, single-layer and single-mode interface are then performed to validate the linear solutions and investigate the reverberating waves inside the layers. It is proved that the layer-coupling effect destabilises the dual layer, especially when the initial layers are thin, and the reverberating waves impose additional instabilities on all interfaces. Our findings suggest that a slow/fast configuration with a large thickness in a dual layer can facilitate the suppression of hydrodynamic instabilities.