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Journal of Applied Mechanics and Technical Physics

2017 year, number 5

Turbulization of the Wake behind a Single Roughness Element on a Blunted Body at a Hypersonic Mach Number

P. A. Polivanov, Yu. V. Gromyko, A. A. Sidorenko, A. A. Maslov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: пограничный слой, гиперзвуковые скорости, ламинарно-турбулентный переход, шероховатость, энтропийный слой, boundary layer, hypersonic velocity, laminar-turbulent transition, roughness, entropy layer


The influence of a cylinder-shaped single roughness element on the laminar-turbulent transition in the presence of an entropy layer is experimentally studied. The experiments are performed on a blunted cone mode at the Mach number M=5. The roughness element is located on the blunted tip of the model. Information about the mean and fluctuating parameters of the boundary layer in the wake behind the roughness element is obtained by using hot-wire anemometry. It is shown that flow turbulization behind the roughness elements occurs at the local Reynolds number calculated on the basis of the roughness element height and equal to 400-500. It is found that the presence of the roughness element exerts a significant effect on the unsteady characteristics of the boundary layer if the roughness element height is smaller than the effective value.