Lin He

TL;DR: In this article, a new method based on Nano-based Planar Laser Scattering (NPLS) technique is proposed to measure supersonic density field, which calibrates the relationship between density and concentration of tracer particles, which would display the density fluctuation due to the influence of shock waves and vortexes.

TL;DR: In this article, a flat-plate zero-pressure-gradient boundary layer at Mach 3 was visualized via nanoparticle-based planar laser scattering (NPLS), and coherent structures such as an individual hairpin vortex and hairpin packet were identified in the streamwise-wall-normal plane on the basis of the now accepted hairpin model.

TL;DR: In this paper, the fractal dimension of the transitional region and the fully developing turbulence region of the supersonic mixing layer were measured based on the box-counting method, and the corresponding images distinctly reproduced the flow structure of laminar, transitional and turbulent region.

TL;DR: In this article, the flow control of a supersonic mixing layer was studied in a wind tunnel with convective Mach number (Mc) at 0.5 and perturbation tapes on the trailing edge of the splitter plate.

TL;DR: Nanoparticle-based planar laser scattering was used to measure the density distribution of the supersonic turbulent boundary layer and the optical path difference and found that the inner layer plays a dominant role, followed by the outer layer.