초록 ▼

The present invention comprises a high performance, horizontal, zero-net mass-flux, synthetic jet actuator for active control of viscous, separated flow on subsonic and supersonic vehicles. The present invention is a horizontal piezoelectric hybrid zero-net mass-flux actuator, in which all the walls

The present invention comprises a high performance, horizontal, zero-net mass-flux, synthetic jet actuator for active control of viscous, separated flow on subsonic and supersonic vehicles. The present invention is a horizontal piezoelectric hybrid zero-net mass-flux actuator, in which all the walls of the chamber are electrically controlled synergistically to reduce or enlarge the volume of the synthetic jet actuator chamber in three dimensions simultaneously and to reduce or enlarge the diameter of orifice of the synthetic jet actuator simultaneously with the reduction or enlargement of the volume of the chamber. The present invention is capable of installation in the wing surface as well as embedding in the wetted surfaces of a supersonic inlet. The jet velocity and mass flow rate for the SJA-H will be several times higher than conventional piezoelectric actuators.

대표청구항 ▼

1. A synthetic jet actuator comprising: a plurality of walls forming a chamber, one of the plurality of walls defining an orifice therethrough, each of the plurality of walls comprising electroactive material,wherein the plurality of walls further comprise:an electroactive circular plate;an electroa

1. A synthetic jet actuator comprising: a plurality of walls forming a chamber, one of the plurality of walls defining an orifice therethrough, each of the plurality of walls comprising electroactive material,wherein the plurality of walls further comprise:an electroactive circular plate;an electroactive cylindrical wall; andan electroactive diaphragm;wherein the electroactive circular plate and the electroactive diaphragm are joined to the electroactive cylindrical wall at opposing ends of the electroactive cylindrical wall such that the formed chamber has a closed cylinder shape; and wherein the electroactive circular plate defines the orifice therethrough. 2. The synthetic jet actuator of claim 1, wherein the electroactive circular plate and the electroactive cylindrical wall comprise multiple layers of electroactive material. 3. The synthetic jet actuator of claim 1, wherein the electroactive diaphragm comprises a layer of electroactive material bonded to a layer of metal. 4. The synthetic jet actuator of claim 3, wherein the electroactive material layer comprises multiple concentric cylinders of electroactive material. 5. The synthetic jet actuator of claim 3, wherein the electroactive diaphragm is sized such that at least the electroactive material layer fits within the electroactive cylindrical wall. 6. The synthetic jet actuator of claim 5, wherein a flexible scaler is disposed between the electroactive material layer and the electroactive cylindrical wall. 7. The synthetic jet actuator of claim 1, wherein a positive strain and a negative strain of the electroactive circular plate are configured such that, when voltage is applied to the electroactive circular plate, (i) a height of the electroactive circular plate increases, (ii) a diameter of the electroactive circular plate decreases, and (iii) a diameter of the orifice decreases. 8. The synthetic jet actuator of claim 1, wherein a positive strain and a negative strain of the electroactive cylindrical wall are configured such that, when voltage is applied to the electroactive cylindrical wall, (i) a height of the electroactive cylindrical wall decreases, (ii) a thickness of the electroactive cylindrical wall increases, and (iii) an inner diameter of the electroactive cylindrical wall decreases. 9. The synthetic jet actuator of claim 1, wherein a positive strain and a negative strain of the electroactive diaphragm are configured such that, when voltage is applied to the electroactive diaphragm, a diameter of the electroactive diaphragm increases, thereby causing a center of the electroactive diaphragm to flex toward the electroactive circular plate. 10. The synthetic jet actuator of claim 1, wherein the orifice has a generally frustoconical shape.