Self-excited periodic oscillations in a supersonic laminar flow past a blunt-fin body mounted on a plate

Abstract

Results of numerical simulation of supersonic gas flow past a blunt fin mounted on a flat plate with developing laminar boundary layer are presented. The calculations cover flow cases with the freestream Mach number of 6.7 and three different Reynolds numbers. A detailed analysis of flow characteristics such as temperature and surface heat flux are presented. In the smaller Reynolds number case, solution is steady-state and agrees very well with known numerical and experimental data. In case of larger Re values, the flow becomes periodic. These regimes are characterized by self-excited non-linear oscillations with almost the same fundamental frequency.

Dual Numerical Solution for 3D Supersonic Laminar Flow Past a Blunt-Fin Junction: Change in Temperature Ratio as a Method of Flow Control

“…As it was shown in [9] and in our paper [11], periodic oscillations can occur in the flow at some values of determining parameters. The study of such unsteady behavior with the definition of its physical nature is of great theoretical and practical interest (including the problem of laminar-turbulent transition) and will be investigated in our further research.…”

“…In the case of supersonic flow past any obstacle mounted on the streamline surface, separation of the flow occurs due to the interaction of the shock wave with the boundary layer. The complex problem of the shock wave/boundary layer interaction is of great scientific and practical importance and has been intensively studied for many years, starting from the 1950s (see, for instance, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]).…”

“…The model problem of supersonic flow past a symmetric blunt fin mounted on a plate is most often considered in the literature [5][6][7][8][9][10][11][12][13][14][15]. This type of geometry is a simplified representation of a wing-body or fin-body junction on a high-speed vehicle [16].…”