典型高超声速内转式进气道激光散射流场显示

doi:10.7527/S1000-6893.2017.121414

Abstract

Abstract: A planar laser scattering system is built and then verified in a shock tunnel with a nominal Mach number of 6. A proper amount of water vapor is added into the test gas before the experiment, and then the water vapor condenses into tiny particles when it goes through the shock tunnel nozzle. The condensed H₂O particles are used as tracers for the planar laser scattering. With the help of this flow visualization method and sophisticated arrangements of the optical path, the flow field of a hypersonic inward-turning inlet with a transition from the elliptical-like to circular shape is observed in experiments, and the preliminary flow structure in the inlet forebody and the isolator are obtained. The results show that the nominal diameter of the condensate tracers is approximately 67 nm with good following performances in the flow field. The forebody shock is curved and inflected obviously, and is concaved near the symmetry and raised at the sides. Based on several laser scattering images, the three-dimensional forebody shock is rebuilt using a spline interpolation method. As a result, the forebody shock looks like an oblique scoop. There are two pairs of streamwise vortices in the isolator. One vortex-pair near the body-side is large and the other vortex-pair near the cowl-side is small, and both are unsteady. The high-speed flow concentrates in the core region of the isolator and inclines slightly to the cowl-side, whereas the low-speed flow accumulates on the body-side. The flow field of the isolator is thus nonuniform.

Key words: hypersonic, inward-turning inlet, flow visualization, planar laser scattering, curved shock, streamwise vortex

CLC Number:

V211.48

LI Yiming, LI Zhufei, YANG Jiming, WU Yingchuan, YU Anyuan. Flow visualization of a typical hypersonic inward-turning inlet using laser scattering[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(12): 121414-121414.

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Flow visualization of a typical hypersonic inward-turning inlet using laser scattering

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