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The lift-off characteristics of supersonic streamwise vortex in obliqueshock-wave/jet interaction (OS/JI for short), extracted from a wall-mount rampinjector in scramjet, is studied through Large-eddy simulation method. Shockedhelium jet is deformed into a pair of streamwise vortex with a co-rotatingcompanion vortex showing the lift-off characteristic immediately after shock.Based on the objective coordinate system in frame of oblique shock structure,it is found that the nature of three-dimensional lift-off structure of ashockinduced streamwise vortex is inherently and precisely controlled by atwo-stage growth mode of structure kinetics of a shock bubble interaction (SBIfor short). The striking similar structures between OS/JI and SBI support theproposition that the lift-off of streamwise vortex is the result of aunderlying two-dimensional vortical motion. By considering the first stageimpulsive linear growth rate, an improved vortex propagation model suitable forSBI is proposed and validated. The lift-off phenomena of both numerical OS/JIcase in this paper and wall-mounted ramp injector cases in literature are wellexplained under the two-stage structure kinetics model of SBI. This modelfurther predicts that for higher free stream Mach number (M > 5), increasingramp compression shows little effect on elevating streamwise vortex whileevident lift-off may occur for lower Mach number (M < 3.5), which offers thenew way for preliminary design of streamwise vortex-based ramp injector inscramjet.

Two-stage growth mode for lift-off mechanism in oblique shock-wave/jet interaction