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Effect of large-scale vortical structure on mixing and spreading of shearlayer is numerically investigated. Two strut configurations namely Straight &Tapered strut at two convective Mach numbers (Mc = 1.4 & 0.37) for two jetheights (0.6 & 1mm) are investigated. Hydrogen jet is injected through atwo-dimensional slot in oncoming coflow at Mach 2. Excellent agreement betweensimulated and experimental data is witnessed, whereas the instantaneous datareveal the presence of various large-scale structures in the flow field. Fromthe instantaneous field, it becomes apparent that both the geometries havedifferent vortical breakdown locations. It is also noticed that an early onsetof vortex breakdown manifests itself into the mixing layer thicknessenhancement, effect of which is reflected in overall mixing characteristics. Itbecomes evident that the shear strength plays an important role in the nearfield mixing. The higher shear strength promotes the generation of largevortices. The analysis shows that SS-0.6 case offers highest mixing efficiencybeing dominated by relatively large-scale structures. Eigenmodes obtainedthrough Proper Orthogonal Decomposition (POD) confirm the presence ofdominating structures and shed light into the series of events involved invortex pairing/merging and breakdown. Dynamic modal decomposition (DMD) alsostrengthens the observation made through the POD.

Investigation of Mixing Characteristics in Strut Injectors using Modal Decomposition