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Exhaust gas diffuser of a gas turbine

Inactive Publication Date: 2013-07-04
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about improving the efficiency of an exhaust gas diffuser by utilizing secondary flows generated on the support struts of the rear bearing star in the event of swirled inflow. The guide body of the exhaust gas diffuser has recesses and guide elements distributed over the circumference in a conical or cylindrical shape to guide and intensify the secondary flows. The shortened design of the support body allows for a freestanding design and reduces the length of backflow zones aft of the hub, resulting in increased efficiency of the exhaust gas diffuser. The guide body has a cross-sectional contour that reduces vibration and outlet-side support is avoided to further reduce aerodynamic losses. The invention also reduces the overall axial length of the exhaust gas diffuser and allows for a smaller heating surface, resulting in improved efficiency of the gas turbine.

Problems solved by technology

It is disadvantageous, however, that the guide body is comparatively long and therefore has to be supported by additional struts on account of its length.
In addition, the aerodynamic influences of the support struts are not taken into account.

Method used

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  • Exhaust gas diffuser of a gas turbine
  • Exhaust gas diffuser of a gas turbine
  • Exhaust gas diffuser of a gas turbine

Examples

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Embodiment Construction

[0017]Shown in FIG. 1 is an exhaust gas diffuser 10 for a gas turbine in a longitudinal section, wherein the bearing star 12, which is arranged in the center of the exhaust gas diffuser 10, for the turbine-side support of the gas turbine rotor and of the guide body 14 which is arranged on the bearing star, is shown in perspective view. The exhaust gas diffuser 10 has a center axis 16 lying in its center, which extends from an inlet-side end 18 to an outlet-side end 20. Provision is made in the exhaust gas diffuser 10 for a flow duct 22, the cross section of which, being perpendicular to the center axis, has an annular contour. The flow duct 22 is delimited in this case by a radially outward disposed outer wall 24. The guide body 14 is arranged in the center of the exhaust gas diffuser 10, that is to say in the region of its center axis 16, and in this case constitutes the radially inward disposed boundary of the flow duct 22. The guide body 14 is supported in this case by five suppo...

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Abstract

An exhaust gas diffuser for a gas turbine includes a flow duct which widens towards a diffuser outlet. The flow duct includes an axially extending guide body, wherein the guide body, at least in an axial section of its longitudinal extent, has a plurality of recesses which are distributed over the circumference and arranged between guide elements. Each guide element extends along a spiral line along the longitudinal extent of the guide body. Further, a gas turbine plant with such an exhaust gas diffuser is provided.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2011 / 056210 filed Apr. 19, 2011, and claims the benefit thereof. The International Application claims the benefits of European Patent Application No. 10004244.9 EP filed Apr. 21, 2010. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention relates to an exhaust gas diffuser for a gas turbine, having a flow duct which widens towards the diffuser outlet and in the center of which provision is made for an axially extending guide body.BACKGROUND OF INVENTION[0003]Such an exhaust gas diffuser serves for decelerating the exhaust gas flow of a gas turbine and for recuperating at least some of the dynamic pressure. In order to disclose an exhaust gas diffuser with a comparatively large opening angle of 10° and more, it is known from DE 198 05 115 A1, for example, to provide an axially extending guide body ...

Claims

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Application Information

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IPC IPC(8): F01D25/30
CPCF01D5/145F01D25/30F05D2250/25F05D2250/15F02K1/04
Inventor BROEKER, MARCBUCHAL, TOBIAS
Owner SIEMENS AG
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