Flow control device to eliminate cavity resonance

In a fluid flow passage having an inlet with an opening defined between an upstream inlet edge and a downstream inlet edge, the passage being capable of accepting exterior flow therein via the opening, portions of exterior fluid flowing over the opening across the upstream and downstream inlet edges to form a shear layer;

• the passage further including a closed or nearly closed end with a valve, the valve having an open position in which air may flow out the passage end and a closed or nearly closed positioned in which air is prohibited from flowing out the passage end;
• an improvement comprising:
• a flow control device for eliminating flow-induced cavity resonance within the flow passage when the valve is in a closed or nearly closed positioned, the flow control device comprising at least one inlet guide vane having a leading edge and a trailing edge, the vane being adapted for connection to the inlet within the passage, the vane being positioned in a fixed stationary orientation such that the vane leading edge intercepts the exterior flow shear layer and the vane trailing edge is located within the passage;
• wherein during the valve closed or nearly closed position, the flow control device promotes destruction of flow-induced cavity resonance within the passage;
• and during the valve open position, the flow control device presents minimal flow losses.