Control systems supersonic air intakes

Adjustable SVZ has a device to change the geometry of surfaces of compression supersonic flow (wedge angles of the panels for the flat in the SVZ, shape or position of the central body for the axisymmetric TWA), the entrance area or the area of ​​the throat form subsonic channel area air discharge flaps subsonic part.

According to the method of deceleration of the supersonic flow, the SVZ of external compression (braking to the input plane), mixed compression (inhibition both up to the input plane and inside the channel) and internal compression (braking inside the channel) are distinguished. Supersonic OT of mixed and internal compression can be triggered or self-starting. Under the launch of CBZ is understood the formation of supersonic flow inside the channel in the area from the entrance plane to the throat. The method of braking the flow in the SVZ affects the characteristics of its control system and the interaction of the contours of the control of the SVZ and GTE.

The relationship between the change in the tilt angles of shocks and the area of ​​the throat when you change the angles of the panels wedge for BCR External compression is chosen so that the air passing through the oblique shocks, could not pass through the throat SVZ. Then the front of the plane entrance SVZ is the shock wave, and throat SVZ set flow rate corresponding.

In the optimal mode of operation, the SVZ area should be chosen so that the pressure recovery coefficient in the subsonic part of the SVZ has the maximum value, and the shock wave in front of the entrance plane is located at the minimum distance from the shell edge. With a larger area, a subsonic flow will be established, and the shock wave will move farther from the entrance plane, which will lead to an increase in the external resistance of the SVZ. 

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