Features of the Flow Structure in the Boundary Layer on the Flying Wing Model

Read more Abstract
In a subsonic wind tunnel, the effect of slip and attack angles on the separation structure of the flow around the model of a trapezoidal flying wing was experimentally studied. In the course of this fundamental study, visualization patterns of a near-wall flow on the leeward side of the wing were obtained at the angles of attack of 0 and 18 degrees and oncoming flow velocity of 25 m/s. It was shown for the first time that gradual increase in slip angle of the wing leads to the restructuring of the flow, up to the disappearance of the local or global separation region on one of the consoles of the model. At the same time, on the second console, the separation is maintained. An increase in the angle of attack of the swept wing led to the development of a separation region: from a locally separated bubble to separation from the leading edge with a reverse flow and the formation of a pair of large-scale vortices. For the first time, singular points on the surface of the model for each mode have been found; by setting cone-shaped perturbation sources in these points one can achieve a significant improvement in the flow around the wing.

Keywords
local separation bubble, global stall, three-dimensional boundary layer, trapezoidal flying wing, flow control, slip angle, angle of attack, vortices
Funding
This work was carried out within the framework of the Program of Fundamental Scientific Research of State Academies of Science for 2021–2023 (project 121030500149-8). The work was carried out using the Equipment Sharing Center “Mechanics” of ITAM SB RAS.
УДК 532.526

Features of the Flow Structure in the Boundary Layer on the Flying Wing Model