4.7 Article

Early stage evolution of naturally developing Gortler streaks

期刊

PHYSICS OF FLUIDS
卷 33, 期 6, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/5.0055849

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资金

  1. National Natural Science Foundation of China [10921202, 11221061, 11632002, 11521091, 11602005, 91752202]
  2. National Key Project [GJXM92579]

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This study visualizes naturally developing Gortler streaks using Rayleigh scattering technique for the first time in hypersonic flow, showing that three-dimensional waves play a crucial role in the formation of Gortler streaks and mushroom-like structures.
This is a companion paper to a previous study of hypersonic boundary layer transition over a concave wall [Huang et al., Inner structures of Gortler streaks, Phys. Fluids 33, 034116 (2021)]. Experiments are performed in a Mach 6.5 quiet wind tunnel using CO2-enhanced filtered Rayleigh scattering flow visualization, PCB fast-response pressure sensors, and a high-frequency Schlieren technique to investigate naturally developing Gortler streaks. This is the first time that naturally developing Gortler streaks have been visualized using the Rayleigh scattering technique in a hypersonic flow. The results show that three-dimensional waves can be clearly visualized inside the Gortler streaks. More importantly, these waves are amplified owing to Gortler instability, contributing to the formation of Gortler streaks and mushroom-like structures. Thus, the three-dimensional waves can be considered to be basic structures inside Gortler streaks and to play a crucial role in boundary layer transition.

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