Open AccessInvestigation of the Flow behind the Roughness Element on the UAV Surface at a Favorable Pressure Gradient
Author(s) -
А. М. Павленко,
В. С. Каприлевская,
В. В. Козлов,
М. М. Катасонов
Publication year - 2020
Publication title -
sibirskij fizičeskij žurnal
Language(s) - English
Resource type - Journals
ISSN - 2541-9447
DOI - 10.25205/2541-9447-2020-15-2-61-72
Subject(s) - wind tunnel , reynolds number , boundary layer , mechanics , surface roughness , surface finish , flow visualization , boundary element method , perturbation (astronomy) , materials science , pressure gradient , hypersonic wind tunnel , flow (mathematics) , meteorology , finite element method , physics , structural engineering , engineering , turbulence , composite material , quantum mechanics
In a wind tunnel of low subsonic speeds, an experimental study was conducted of the windward flow of a trapezoidal model of a flying wing (UAV) with a locally installed perturbation generator in the region of maximum susceptibility on its surface. The generator was a three-dimensional roughness element whose height was comparable to the thickness of the boundary layer. The uniqueness of the work was that the experiments were carried out in a wind tunnel at real flight Reynolds numbers on a UAV model at a scale of 1:1. The results of visualization of the flow near a smooth surface and behind roughness were obtained using the method of liquid crystal thermography. The internal structure and processes of development of the longitudinal perturbation behind the roughness downstream were studied in detail using the thermoanemometry method.