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An aircraft cabin pressure control system outflow valve includes a frame, a valve element, and a vortex generator structure. The vortex generator structure is coupled to the valve element and is rotatable therewith, and includes a plurality of first vortex generators and a plurality of second vortex

An aircraft cabin pressure control system outflow valve includes a frame, a valve element, and a vortex generator structure. The vortex generator structure is coupled to the valve element and is rotatable therewith, and includes a plurality of first vortex generators and a plurality of second vortex generators. The first vortex generators spaced are apart from each other and are configured to generate first vortices when the valve element is in an open position and fluid flows through the flow passage. The second vortex generators are formed in each of the first vortex generators and are spaced apart from each other. The second vortex generators are each configured to generate second vortices, which are smaller than the first vortices, when the valve element is in an open position and fluid flows through the flow passage.

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1. An aircraft cabin pressure control system outflow valve, comprising: a frame configured to be mounted on an aircraft, and having an inner surface that defines a flow passage through the frame;a valve element disposed within the flow passage and rotationally coupled to the frame, the valve element

1. An aircraft cabin pressure control system outflow valve, comprising: a frame configured to be mounted on an aircraft, and having an inner surface that defines a flow passage through the frame;a valve element disposed within the flow passage and rotationally coupled to the frame, the valve element adapted to receive an actuator output drive torque and configured, in response thereto, to rotate between a closed position and a plurality of open positions; anda vortex generator structure coupled to the valve element and rotatable therewith, the vortex generator structure comprising: a plurality of first vortex generators, the first vortex generators spaced apart from each other and configured to generate first vortices when the valve element is in an open position and fluid flows through the flow passage, anda plurality of second vortex generators formed in each of the first vortex generators and spaced apart from each other, the second vortex generators each configured to generate second vortices, which are smaller than the first vortices, when the valve element is in an open position and fluid flows through the flow passage. 2. The outflow valve of claim 1, wherein: each of the first vortex generators has a first cross sectional area; andeach of the second vortex generators has a second cross sectional area that is smaller than the first cross sectional area. 3. The outflow valve of claim 2, wherein: each of the first vortex generators comprises a fixed end and a free end;the fixed end of each of the first vortex generators are coupled to the valve element and to each other;the free end of each of the first vortex generators extend from the valve element; andeach of the second vortex generators is formed a free end of a first vortex generator. 4. The outflow valve of claim 1, wherein: the valve element comprises an aft door and a forward door, each door disposed within the flow passage, rotationally coupled to the frame, and responsive to the actuation drive force to rotate to a position between a closed position and a plurality of open positions; andthe vortex generator structure is coupled to the forward door. 5. The outflow valve of claim 1, further comprising: an actuator coupled between the frame and the valve element, the actuator adapted to receive actuation commands and operable, in response thereto, to supply the actuator output drive torque to the valve element. 6. The outflow valve of claim 5, wherein the actuator comprises a plurality of motors, each motor adapted to receive actuation commands and operable, upon receipt thereof, to supply a drive torque. 7. An aircraft cabin pressure control system outflow valve, comprising: a frame configured to be mounted on an aircraft and having an inner surface that defines a flow passage through the frame;an aft valve door disposed within the flow passage and rotationally coupled to the frame, the aft valve door adapted to receive an actuator output drive torque and configured, in response thereto, to rotate between a closed position and a plurality of open positions;a forward valve door disposed within the flow passage and rotationally coupled to the frame, the forward valve door adapted to receive the actuator output drive torque and configured, in response thereto, to rotate, simultaneously with the aft valve door, between a closed position and a plurality of open positions; anda vortex generator structure coupled to the forward valve door and rotatable therewith, the vortex generator structure comprising: a plurality of first vortex generators, the first vortex generators spaced apart from each other and configured to generate first vortices when the forward and aft valve doors are in an open position and fluid flows through the flow passage, anda plurality of second vortex generators formed in each of the first vortex generators and spaced apart from each other, the second vortex generators each configured to generate second vortices, which are smaller than the first vortices, when the forward and aft valve doors are in an open position and fluid flows through the flow passage. 8. The outflow valve of claim 7, wherein: each of the first vortex generators has a first cross sectional area; andeach of the second vortex generators has a second cross sectional area that is smaller than the first cross sectional area. 9. The outflow valve of claim 8, wherein: each of the first vortex generators comprises a fixed end and a free end;the fixed end of each of the first vortex generators are coupled to the valve element and to each other;the free end of each of the first vortex generators extend from the valve element; andeach of the second vortex generators is formed a free end of a first vortex generator. 10. The outflow valve of claim 7, further comprising: an actuator coupled between the frame and the valve element, the actuator adapted to receive actuation commands and operable, in response thereto, to supply the actuator output drive torque to the valve element. 11. The outflow valve of claim 10, wherein the actuator comprises a plurality of motors, each motor adapted to receive actuation commands and operable, upon receipt thereof, to supply a drive torque.