In high speed flow, the existence of shock waves most often entails either drag increase or efficiency losses. A major cause of performance degradation is the interaction of the shock with a boundary layer. Then complex phenomena occur which contributes to increase friction losses, especially if the shock is strong enough to separate the boundary layer. To a separated flow are associated typical wave patterns resulting from the shocks induced by the separation and reattachment processes and which play a major role in the production of entropy by the flow. Since shocks cannot be avoided in most situations, control techniques have been proposed to limit their negative effects. The mode of operation of these techniques can be well understood by a clear identification of shock wave/boundary layer interaction properties. The control actions can be performed by a proper manipulation of the boundary layer upstream of the interaction domain in order to increase its resistance to the shock action (by blowing or lowering the wall temperature, or using vortex generators) or by a local action in the shock foot region. Then active, passive or hybrid control which combines the two previous actions can be applied. Other methods can be envisaged, like the installation of a bump in the shock foot region to adapt the surface contour in order to weaken the shock. None of these techniques brings the ideal answer to the problem of shock wave/boundary layer interaction control. Thus, the definition of a solution closely depends on the objective of the control. In addition, the appropriateness of implementing a control device highly depends on economical issues in terms of weight penalty, manufacturing and maintenance cost and energy consumption.
[1]
Dean R. Chapman,et al.
Investigation of separated flows in supersonic and subsonic streams with emphasis on the effect of transition
,
1958
.
[2]
Egon Stanewsky,et al.
EUROSHOCK - Drag reduction by passive shock control : Results of the project EUROSHOCK, AER2-CT92-0049 ; Supported by the European Union 1993-1995
,
1997
.
[3]
Jean Delery,et al.
Study of Passive Control in a Transonic Shock Wave/Boundary-Layer Interaction
,
1998
.
[4]
M. Lighthill,et al.
On boundary layers and upstream influence II. Supersonic flows without separation
,
1953,
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.
[5]
Michael Holden,et al.
Shock interaction phenomena in hypersonic flows
,
1998
.
[6]
Jean Delery,et al.
Shock wave/turbulent boundary layer interaction and its control
,
1985
.
[7]
Passive Control of Shock Wave - Boundary Layer Interaction and Porous Plate Transpiration Flow
,
1997
.
[8]
J. Delery.
Etude expérimentale de la réflexion d'une onde de choc sur une paroi chauffée en présence d'une couche limite turbulente
,
1992
.
[9]
J. M. Delery,et al.
Shock phenomena in high speed aerodynamics: still a source of major concern
,
1999,
The Aeronautical Journal (1968).