Unsteady shock/boundary layer interaction of compression corner at movement conditions

Unsteady shock/boundary layer interaction generated by 2-D compression corner under movement conditions is studied by numerical calculating the unsteady Reynolds averaged N-S equations, and the unsteady characteristics of separation zone during the process of pitching up, pitching down and periodically oscillating are analyzed. The numerical results show that when the model pitches up, the size of separation region becomes smaller, and when the model pitches down, the size of separation region becomes larger. The positions of separation points, reattachment points and shock oscillate periodically as the oscillation of the compression corner and the frequency of the oscillation agrees with each other. When the amplitude of model increases, the change of separation region becomes wider. When the frequency of model increases, the position of the maximal and minimal separation region is distinctly changed during the oscillation of compression corner. Furthermore, the results are compared to those calculated at static conditions, and conclusion is achieved that the variation of separation region is dominated by both of the pitching angle and the unsteady movement effects. Changing of pitching angel leads to the change of free stream Mach number, which have influence on the separation flow.