The characteristics and evolution of large-scale structures in compressible mixing layers

• DOI: 10.1063/1.868609
• Publication Date: 2002-07-26T12:36:59Z
• Authors: Gregory S. Elliott; Mo Samimy; Stephen A. Arnette
• Keywords: Helmholtz free energy

Single- and double-pulsed visualizations were employed to study the characteristics evolution of large-scale structures in compressible mixing layers with convective Mach numbers (Mc) 0.51 0.86. Instantaneous images spatial correlations based on large ensembles show that which span entire layer thickness are a more dominant feature at Mc=0.51 than Mc=0.86. Double-pulsed developing region structures’ formation proceed as roll-up wavy region, agreement Kelvin–Helmholtz picture structure derived from studies incompressible layers. However, little indication was present for In fully developed evolve similarly those layers, even undergoing pairing processes. Similar processes not encountered Mc=0.86; instead, it difficult track motions between initial delayed images. Convective velocities space-time good theoretical velocity center layer, but higher value toward high-speed side lower low-speed side.