GAS TURBINE EXHAUST DIFFUSER HAVING PLASMA ACTUATOR
A gas turbine is provided, including a turbine, an exhaust diffuser, and a plasma actuator. The turbine releases an exhaust gas. The exhaust diffuser receives the exhaust gas from the turbine. The exhaust diffuser has an inlet and an outlet, and at least one wall that is disposed between the inlet and the outlet. The plasma actuator produces a plasma along the at least one wall of the diffuser.
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The subject matter disclosed herein relates to a gas turbine, and more specifically to a gas turbine exhaust diffuser having a plasma actuator for producing a plasma.
Gas turbines generally include a compressor, a combustor, one or more fuel nozzles, a turbine and an exhaust diffuser. Air enters the gas turbine through an air intake and is compressed by the compressor. The compressed air is then mixed with fuel supplied by the fuel nozzles. The air-fuel mixture is supplied to the combustors at a specified ratio for combustion. The combustion generates pressurized exhaust gases, which drive blades of the turbine. An exhaust diffuser may be utilized to improve efficiency of the last stage turbine blade, which is also referred to as a last stage bucket, by decreasing the static pressure at the turbine exit.
The exhaust diffuser generally consumes a large amount of space. The exhaust diffuser includes an inlet and an outlet that are located between diverging walls of the exhaust diffuser. An axial length of the exhaust diffuser is measured between the inlet and the outlet of the exhaust diffuser. If the axial length of the diffuser is not sufficient and is too short, flow separation may occur at the diverging walls of the exhaust diffuser, which results in pressure losses.
BRIEF DESCRIPTION OF THE INVENTIONAccording to one aspect of the invention, a gas turbine is provided, including a turbine, an exhaust diffuser, and a plasma actuator. The turbine releases an exhaust gas. The exhaust diffuser receives the exhaust gas from the turbine. The exhaust diffuser has an inlet and an outlet, and at least one wall that is disposed between the inlet and the outlet. The plasma actuator produces a plasma along the at least one wall of the diffuser.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
DETAILED DESCRIPTION OF THE INVENTIONReferring back to
Referring back to
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
Claims
1. A gas turbine, comprising:
- a turbine releasing an exhaust gas;
- an exhaust diffuser for receiving the exhaust gas from the turbine, the exhaust diffuser having an inlet, an outlet and at least one wall that is disposed between the inlet and the outlet; and
- a plasma actuator producing a plasma along the at least one wall of the diffuser.
2. The gas turbine of claim 1, wherein the exhaust diffuser includes an inner diffuser and an outer diffuser, wherein the inner diffuser is generally concentric with the outer diffuser.
3. The gas turbine of claim 2, wherein the inner diffuser includes an inner wall, and wherein the plasma actuator is disposed along the inner wall of the inner diffuser.
4. The gas turbine of claim 2, wherein the outer diffuser includes an outer wall, and wherein the plasma actuator is disposed along the outer wall of the inner diffuser.
5. The gas turbine of claim 2, wherein the inner diffuser includes a generally annular configuration.
6. The gas turbine of claim 2, wherein the outer diffuser includes a generally conical configuration.
7. The gas turbine of claim 2, comprising at least one manway located between the inner diffuser and the outer diffuser, wherein the at least one manway includes an outer manway surface, and wherein another plasma actuator is located along the outer manway surface.
8. The gas turbine of claim 1, comprising an exhaust strut that is located between an inner wall and an outer wall of the exhaust diffuser, the exhaust strut having a cross-section, wherein the cross-section of the exhaust strut includes an airfoil shape.
9. The gas turbine of claim 8, comprising an exhaust strut plasma actuator that is disposed along an outer surface of the exhaust strut.
10. The gas turbine of claim 1, wherein the plasma actuator includes an inner electrode, an outer electrode, and a dielectric material.
11. A gas turbine, comprising:
- a turbine releasing an exhaust gas;
- an exhaust diffuser for receiving the exhaust gas from the turbine, the exhaust diffuser having an inlet and an outlet, comprising: an inner diffuser disposed between the inlet and the outlet, the inner diffuser having an inner wall; an outer diffuser disposed between the inlet and the outlet, the outer diffuser having an outer wall, the inner diffuser generally concentric with the outer diffuser; and
- a plasma actuator producing a plasma along at least one of the inner wall and the outer wall.
12. The gas turbine of claim 11, wherein the inner diffuser includes a generally annular configuration.
13. The gas turbine of claim 11, wherein the outer diffuser includes a generally conical configuration.
14. The gas turbine of claim 11, comprising at least one manway located between the inner diffuser and the outer diffuser, wherein the at least one manway includes an outer manway surface, and wherein another plasma actuator is located along the outer manway surface.
15. The gas turbine of claim 11, comprising an exhaust strut that is located between an inner wall and an outer wall of the exhaust diffuser, the exhaust strut having a cross-section, wherein the cross-section of the exhaust strut includes an airfoil shape.
16. The gas turbine of claim 15, comprising an exhaust strut plasma actuator that is disposed along an outer surface of the exhaust strut.
Type: Application
Filed: Jan 12, 2012
Publication Date: Jul 18, 2013
Applicant: GENERAL ELECTRIC COMPANY (Schenectady, NY)
Inventors: Seyed Gholamali Saddoughi (Clifton Park, NY), Deepesh Dinesh Nanda (Kundahalli Colony), Antanu Sadhu (Bangalore)
Application Number: 13/349,299
International Classification: F01D 25/30 (20060101);