Browse Prior Art Database

Blade Platform Impingement Cooling via the Disc Rim

IP.com Disclosure Number: IPCOM000176173D
Published in the IP.com Journal: Volume 8 Issue 11B (2008-11-26)
Included in the Prior Art Database: 2008-Nov-26
Document File: 3 page(s) / 90K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In order to improve the thermal efficiency of modern gas turbines the temperature of the internal components has increased significantly over the past years. For further performance improvements it is thus necessary to improve the cooling techniques on various gas turbine parts. The cooling effectiveness depends on the way how these components are cooled. Up to date the blade-disc attachment for example is cooled in a very simple way, which does not allow a high cooling effectiveness. On the cold side of the platform there are no possibilities for a large variation of cooling designs. Nowadays the cold platform side of the blades can be equipped with turbulators in order to increase the cooling effectiveness.

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Blade Platform Impingement Cooling via the Disc Rim

Idea: Ahmed Fathi, DE-Muelheim; Hans-Thomas Bolms, DE-Muelheim

In order to improve the thermal efficiency of modern gas turbines the temperature of the internal components has increased significantly over the past years. For further performance improvements it is thus necessary to improve the cooling techniques on various gas turbine parts. The cooling effectiveness depends on the way how these components are cooled. Up to date the blade-disc attachment for example is cooled in a very simple way, which does not allow a high cooling effectiveness. On the cold side of the platform there are no possibilities for a large variation of cooling designs. Nowadays the cold platform side of the blades can be equipped with turbulators in order to increase the cooling effectiveness.

A new method is proposed in the following wherein an impingement cooling design is discussed, causing a raise in the cooling effectiveness of the blade-disc attachment. The new design incorporates a hollow cavity in the rim region of the disc. This cavity region does not have a critical loading and does not support the blade disc attachment and can therefore be used for cooling purposes. The cavity can be supported with cooling air in several ways. Two possible designs are shown in figure 1 and 2. The cooling air will exit the...