Exhaust gas diffuser for a gas turbine
a technology of exhaust gas and gas turbine, which is applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of reducing the structural life, vibration and associated noise, and unsatisfactory flow induced forces, etc., and achieves varying success and complexity
Inactive Publication Date: 2014-05-22
GENERAL ELECTRIC CO
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Benefits of technology
The invention is an exhaust gas diffuser with a unique design that improves the performance of gas turbines. It includes an inner and outer wall with a flow passage in between. An airfoil shaped strut is placed in this passage and is tapered to optimize the flow of exhaust gas. This design helps to better control the flow of exhaust gas, which results in improved performance and efficiency of gas turbines.
Problems solved by technology
Such wakes may be unsteady and may create undesirable flow induced forces, vibration and associated noise.
The induced forces and vibration can lead to structural fatigue failure reducing the structural life.
Prior attempts to control vortex shedding from bluff bodies have included providing additional components such as spoilers, vortex generators, and trailing edge attachments with varying degrees of success and complexity.
Method used
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[0016]Reference will now be made in detail to present embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms “first”, “second”, and “third” may be used interchangeably to distinguish one component from another and are not intended to signify location or importance of the individual components. In addition, the terms “upstream” and “downstream” refer to the relative location of components in a fluid pathway. For example, component A is upstream from component B if a fluid flows from component A to component B. Conversely, component B is downstream from component A if component B receives a fluid flow from component A.
[0017]Each example is provided by way of explanation of the invent...
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An exhaust gas diffuser for a gas turbine generally includes an inner wall that extends along an axial centerline of the exhaust gas diffuser. An outer wall is coaxially aligned with the inner wall. The outer wall is radially separated from the inner wall so as to define a flow passage therebetween. An airfoil shaped strut is disposed in the flow passage. The strut extends between the inner and the outer walls. The strut includes a leading edge and a trailing edge positioned relative to a direction of flow through the flow passage. The leading edge and the trailing edge are tapered from the inner wall to the outer wall in the direction of flow through the passage.
Description
FIELD OF THE INVENTION[0001]The present invention generally involves an exhaust gas diffuser for a gas turbine. More specifically, the present invention describes a strut that reduces flow separation within the exhaust gas diffuser to improve the efficiency of the gas turbine.BACKGROUND OF THE INVENTION[0002]Gas turbines are widely used in industrial and power generation operations. A typical gas turbine includes a compressor section, a combustor downstream from the compressor section, and a turbine section downstream from the combustor. A working fluid such as ambient air flows into the compressor section where it is compressed before flowing into the combustor. The compressed working fluid is mixed with a fuel and burned within the combustor to generate combustion gases having a high temperature, pressure, and velocity. The combustion gases flow from the combustor and expand rapidly through the turbine section to rotate a shaft and to produce work. The combustion gases are then ex...
Claims
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IPC IPC(8): F01D25/30
CPCF05D2250/292F01D25/30
Inventor SUBRAMANIYAN, MOORTHICHENGAPPA, MANJUNATH BANGALORE
Owner GENERAL ELECTRIC CO