초록 ▼

A method and apparatus of creating vortices via vortex controllers, wherein the vortices are capable of entraining high-energy surrounding flow to induce a series of powerful longitudinal vortices that reattach separated flow by merging into single vortices along the undersurface of the afterbody to

A method and apparatus of creating vortices via vortex controllers, wherein the vortices are capable of entraining high-energy surrounding flow to induce a series of powerful longitudinal vortices that reattach separated flow by merging into single vortices along the undersurface of the afterbody to reenergize the fuselage boundary layer, thus preventing undersurface flow separation and reducing overall afterbody drag.

대표청구항 ▼

A method and apparatus of creating vortices via vortex controllers, wherein the vortices are capable of entraining high-energy surrounding flow to induce a series of powerful longitudinal vortices that reattach separated flow by merging into single vortices along the undersurface of the afterbody to

A method and apparatus of creating vortices via vortex controllers, wherein the vortices are capable of entraining high-energy surrounding flow to induce a series of powerful longitudinal vortices that reattach separated flow by merging into single vortices along the undersurface of the afterbody to reenergize the fuselage boundary layer, thus preventing undersurface flow separation and reducing overall afterbody drag. 1. An emission device for ejecting a liquid drop, said device comprising: a structure defining a chamber volume adapted to receive a liquid and having a nozzle orifice through which a drop of received liquid can be emitted; a first electrode associated with a movable wall portion of the chamber volume defining structure such that movement of the first electrode in a first direction moves the movable wall portion to increase the chamber volume to draw liquid into the chamber volume; a second electrode associated with the movable wall portion such that movement of the second electrode in a second direction moves the movable wall portion to decrease the chamber volume to emit a liquid drop through the nozzle orifice; and a third electrode between the first and second electrodes such that (1) application of a voltage differential between the first electrode and the third electrode moves the first electrode in said first direction to increase the chamber volume and (2) application of a voltage differential between the second electrode and the third electrode moves the second electrode in said second direction to decrease the chamber volume, said third electrode having opposed surfaces respectively facing each of said first and second electrodes at an angle of contact whereby: movement of the first electrode in the first direction progressively increases contact between the first and third electrodes, and movement of the second electrode in the second direction progressively increases contact between the second and third electrodes. 2. An emission device for ejecting a liquid drop as defined in claim 1, wherein the angles of contact between opposed surfaces of the third electrode and the respectively-faced first and second electrodes are less than 10 degrees. 3. An emission device for ejecting a liquid drop as defined in claim 1, wherein the opposed surfaces of the third electrode are concaved away from the respectively-faced first and second electrodes. 4. An emission device for ejecting a liquid drop as defined in claim 3, wherein the angles of contact between opposed surfaces of the third electrode and the respectively-faced first and second electrodes are less than 10 degrees and tends to 0 degrees as said contact progressively increases. 5. An emission device for ejecting a liquid drop as defined in claim 1, wherein the emission device is a print head of an ink jet printing system. 6. An emission device for ejecting a liquid drop as defined in claim 1, further comprising a controller having: a first state applying an electrostatic charge differential between the first electrode and the third electrode; and a second state applying an electrostatic charge differential between the second electrode and the third electrode. 7. A liquid drop emission device as set forth in claim 6 wherein the controller is adapted to provide a short dwell period between said first and second states. 8. An emission device for ejecting a liquid drop as defined in claim 1, wherein the third electrode is a ground electrode. 9. An emission device for ejecting a liquid drop as defined in claim 8, wherein the ground electrode is structurally stiff. 10. An emission device for ejecting a liquid drop as defined in claim 1, wherein the addressable electrodes are structurally connected by a rigid coupler. 11. An emission device for ejecting a liquid drop as defined in claim 10, wherein the coupler is electrically insulating. 12. An emission device for ejecting a liquid drop as defined in claim 10, wherein the coupler is formed of a conductive material having a non-conductive break therein. 13. An emission device for ejecting a liquid drop, said device comprising: a structure defining a chamber volume adapted to receive a liquid and having a nozzle orifice through which a drop of received liquid can be emitted; structurally coupled, separately electrically addressable first and second dual electrodes movable in a first direction to draw liqu