Abstract
Investigations of the structure of the flow near the surface of a trapezoidal model of a small unmanned aerial vehicle were carried out when it enters a narrow turbulent wake. All experimental data were obtained in a wind tunnel at subsonic flow velocities. A feature of the work was that the study of the flow around the model was carried out at full-scale (flight) Reynolds numbers. Using the soot-oily visualization method, data on the features of the flow around the model were obtained, taking into account such factors as the angle of attack, the presence and absence of a source of external disturbances that generated a turbulent wake. The experiments were carried out in two flow regimes: at a zero angle of attack, when there are local separation bubbles on the wing, and at a large (supercritical) angle of attack of 18 degrees, when there is a global stall of the flow from the leading edge. It was shown that the turbulent wake has a significant effect on the nature of the flow near the model surface in both cases. Local separation bubbles gradually decrease in size with a decrease in the distance between the sources of disturbances and the wing. Large-scale vortices significantly decrease in geometrical dimensions and shift towards the side edges in the event of a global stall of the flow, thereby increasing the region of the attached flow on the model surface.
Highlights
При разработке летательных аппаратов много внимания уделяется вопросам совершенствования обтекания на основании полученных исследователями новых знаний о физических процессах, протекающих при взаимодействии летящего самолета с окружающим воздухом
All experimental data were obtained in a wind tunnel at subsonic flow velocities
A feature of the work was that the study of the flow
Summary
Изучение обтекания трапециевидной модели малоразмерного БПЛА при попадании в турбулентный след. Александр Михайлович Павленко 1, Антон Вячеславович Быков 2 Борис Юрьевич Занин 3, Михаил Михайлович Катасонов 4. Христиановича Сибирского отделения Российской академии наук Новосибирск, Россия. Аннотация Проведены исследования структуры течения вблизи поверхности трапециевидной модели малоразмерного беспилотного летательного аппарата при попадании в узкий турбулентный след. Особенностью работы было то, что изучение обтекания модели проводилось при натурных (полетных) числах Рейнольдса. Источник финансирования Работа была выполнена в рамках Программы фундаментальных научных исследований государственных академий наук на 2021–2023 гг. М. Изучение обтекания трапециевидной модели малоразмерного БПЛА при попадании в турбулентный след // Сибирский физический журнал. 1–4 Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences Novosibirsk, Russian Federation
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