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Cross-flow reducing cooling features

IP.com Disclosure Number: IPCOM000201305D
Original Publication Date: 2010-Nov-10
Included in the Prior Art Database: 2010-Nov-10
Document File: 2 page(s) / 193K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Cooling systems for hot gas turbine components need big volumes of cooling air. For improving the turbine efficiency and the component life, the use of less cooling air is preferable. Nowadays various methods are used to reduce the volume of the required cooling air, e. g., convective cooling, with or without turbulators, impingement cooling, film cooling, or the use of protective coats. Also heat sink holes are used to dump the air directly into the gas path. In the following a novel solution is proposed which uses one area with impingement cooling where no cross-flows can appear and one area with convective cooling where the flow is directed downstream to lower pressure regions. This proposed system uses full height ribs between the heat shield and the impingement plate in combination with impingement jets ascending from the flow. Between the full height ribs spaces are given. In order to direct the flow downstream it is preferred to give an angled design to the ribs; compared to straight ribs, a more stable flow is created and the mixing losses are minimized. In Figures 1 to 3 different perspectives of the proposed solution are depicted. Straight ribs are depicted in Figure 4.

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Cross-flow reducing cooling features

Idea: Johan Friis, SE-Finspang

Cooling systems for hot gas turbine components need big volumes of cooling air. For improving the

turbine efficiency and the component life, the use of less cooling air is preferable. Nowadays various methods are used to reduce the volume of the required cooling air, e. g.,

convective cooling, with or without turbulators, impingement cooling, film cooling, or the use of

protective coats. Also heat sink holes are used to dump the air directly into the gas path.

In the following a novel solution is proposed which uses one area with impingement cooling where no

cross-flows can appear and one area with convective cooling where the flow is directed downstream to

lower pressure regions. This proposed system uses full height ribs between the heat shield and the

impingement plate in combination with impingement jets ascending from the flow. Between the full

height ribs spaces are given. In order to direct the flow downstream it is preferred to give an angled

design to the ribs; compared to straight ribs, a more stable flow is created and the mixing losses are

minimized. In Figures 1 to 3 different perspectives of the proposed solution are depicted. Straight ribs

are depicted in Figure 4.

Figure 5 depicts an alternative design using impingent cavities with offtake flow channels. The

impingem...