Abstract
A large eddy simulation (LES) is conducted to investigate shock wave/turbulent boundary layer interaction in a 24° compression ramp at a high inlet Mach number of Ma=2.9. The recycling/rescaling Method is used as the inflow turbulence generation technique. The shock wave structure and boundary layer flow in the interaction region are studied by flow visualization methods, such as vortex recognition and numerical schlieren. The distributions of turbulent kinetic energy and Reynolds normal stresses at different streamwise locations are analyzed. The results show that a strong anisotropy turbulent flow appears in the reattached boundary layer after the interaction of the shock wave. The large-scale unsteady motion of the separation shock wave is analyzed by using the intermittent factor and power spectrum. It is found that the shock moves around the averaged separation position, and the length scale is equal to 72% of the inlet boundary layer thickness. The power spectrum analysis reveals the existence of low-frequency instability in the separation region.
Highlights
The shock wave/turbulent boundary layer interaction (SWBLI) is one of the important physical phenomena in the supersonic flow, which contains complex aerodynamic and thermodynamic problems
A large eddy simulation is used to study the SWBLI phenomenon of the 24° compression ramp; detailed analysis and discussion are carried out to understand the unsteady features of the shock wave in the SWBLI
This study considers that this lowfrequency motion is caused by the unsteady motion of large-scale separation bubbles
Summary
The shock wave/turbulent boundary layer interaction (SWBLI) is one of the important physical phenomena in the supersonic flow, which contains complex aerodynamic and thermodynamic problems. The 2D compression ramp is a simple geometric model in the SWBLI, the flow phenomena contain boundary layer unsteady flow, separation, reattached flow, and turbulent fluctuation enhancement caused by a strong adverse pressure gradient. Loginov et al (Loginov et al, 2006) used the LES method to study the statistical parameter distributions and fluctuation characteristics of the turbulent boundary layer in the compression ramp and compared numerical results with the experimental data. A large eddy simulation is used to study the SWBLI phenomenon of the 24° compression ramp; detailed analysis and discussion are carried out to understand the unsteady features of the shock wave in the SWBLI.
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