INFLUENCE OF CYLINDRICAL TURBULATORS ON THE BOUNDARY LAYER OF A SWEPT WING TURBULENCE STRUCTURE AND JUMPS IN INTEGRAL PARAMETERS
V. I. Borodulin, A. V. Ivanov, Yu. S. Kachanov, A. P. Roschektaev
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: boundary layer of a swept wing, cylindrical turbulators, induced turbulence structure, jumps in integral parameters
Abstract
The primary goal of this study is to investigate the mechanism of forced transition to turbulence in the laminar boundary layer of a swept wing, dominated by crossflow instability, using spanwise-periodic arrays of cylindrical turbulators. Measurements were carried out using hot-wire anemometry in a low-turbulence wind tunnel at ITAM SB RAS (Novosibirsk) at low subsonic freestream velocities on a model of a 25-degree swept wing. The Reynolds number based on cylinder height ranged from 565 to 3613. All major characteristics of the boundary layers were obtained, which are essential for constructing transfer functions for jumps in integral boundary layer parameters-important for numerical simulation of flows over swept wings with turbulators. The turbulence spectra were shown to be consistent with the Kolmogorov and Heisenberg laws. Empirical formulas by Falkner and Hama for the evolution of integral parameters in a three-dimensional boundary layer were verified and refined. This article represents Part 2 of the study.
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