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Experimental study on time evolution of shock and turbulent boundary layer interactions
Author(s): Xiaoge Lu, Shihe Yi, Lin He, xiaolin liu, Feng Zhang
Keywords: supersonic, SWTBLI, NPLS, temporal and spatial evolution characteristics
In this paper, a test system based on the Nano-tracer Planar Laser Scattering (NPLS) technique for studying time evolution of unsteady flow structures was finished. It mainly solved the problems of stability and beam combination of the multiple single pulse lasers, the overall design and layout of CCD cameras, and the synchronous and accurate control of the test system. Through the debugging of the time sequence and subsystem, the accurate control of the test system was realized. Based on this system, the experimental study on the interactions between the incident shock wave and the turbulent boundary layer of the incoming wall interactions (SWTBLI) was performed. The experiments were conducted in the Mach 3.4 supersonic low-noise wind tunnel, the unit Reynolds number was 6.30×106 m-1. For the first time, five frames of temporal-correlated fine structure images of transient flow field with SWTBLI were obtained under the experimental conditions, and the spatiotemporal evolution characteristics of the flow structure were analyzed. At the same time, the flow field characteristics of temporal-correlated images and different incoming turbulent boundary layer thicknesses were studied. During the development of vortex structure in the boundary layer from turbulent boundary layer to separation bubble, the oscillation interval distribution law of induced shock wave was summarized, and the group velocity of vortex structure development in the boundary layer and the relationship between boundary layer thickness and physical space size growth law of separation bubble under different incoming turbulent boundary layer thicknesses were obtained.