Gas turbine and exhaust gas diffuser thereof

Abstract

#CMT# # / CMT# The diffuser (10) has a flow channel (22) expanded to a diffuser outlet, and an axially extending conducting body (14) provided at center of the diffuser outlet. The conducting body comprises multiple slots (30) that are distributed over circumference and formed among multiple conducting elements (32) in an axial section of longitudinal extension of the conducting body. The body has a cross-sectional contour arranged perpendicular to a center axis (16) of the diffuser and formed in star shape. Teeth of the body are formed by respective conducting elements. #CMT#USE : # / CMT# Exhaust gas diffuser for a gas turbine. #CMT#ADVANTAGE : # / CMT# The conducting body comprises slots that are distributed over the circumference and formed between the conducting elements in the axial section of the longitudinal extension of the conducting body, so that improvement of pressure recovery can be achieved while allowing homogeneous inflow of hot gas from a gas turbine in a heat recovery steam generator downstream to the gas turbine, thus improving the efficiency of the gas turbine. The conducting body has higher rigidity, so that aerodynamical disturbance and leak out-lateral support of the conducting body can be avoided. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a partial sectional perspective view of an exhaust gas diffuser of a gas turbine with a conducting body. 10 : Exhaust gas diffuser 14 : Axially extending conducting body 16 : Center axis 22 : Flow channel 30 : Slots 32 : Conducting elements.

Description

technical field [0001] The invention relates to an exhaust diffuser for a gas turbine, the exhaust diffuser has a flow channel widening toward the diffuser outlet, and an axially extending guide body is provided in the center of the exhaust diffuser. Background technique [0002] Such exhaust diffusers are used to decelerate the gas turbine exhaust flow and to recover at least a portion of the dynamic pressure. In order to obtain an exhaust gas diffuser with a relatively large opening angle of 10° or more, it is known, for example, from DE 198 05 115 A1 to provide an axially extending guide body in the center of the diffuser channel. By using the guide body, the exhaust gas diffuser is configured as an annular diffuser. As a result, a larger area of ​​the recirculation zone behind the gas turbine hub is avoided, which has a favorable effect on the efficiency of the exhaust gas diffuser. However, it is disadvantageous that the guide body is relatively long and must therefor...

AI Technical Summary

Problems solved by technology

However, it is disadvantageous that the guide body is relatively long and must therefore be supported by additional struts due to its length

Furthermore, the aerodynamic effects of the support columns are not considered

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