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A NUMERICAL ANALYSIS OF CROSS-FLOW REINFORCED IMPINGEMENT COOLING WITH A U-SHAPED FLOW-GUIDE ON THE HOLE PLATE

Chargui, Safae (2023) A NUMERICAL ANALYSIS OF CROSS-FLOW REINFORCED IMPINGEMENT COOLING WITH A U-SHAPED FLOW-GUIDE ON THE HOLE PLATE. Student thesis, Université Polytechnique Hauts-de-France.

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Abstract

Impingement cooling offers an efficient usage of cooling air in order to obtain high heat transfer rates. In this study a U-shaped turbulator is installed downstream of the jet hole. This arrangement uses the cross-flow to reinforce the jet by guiding it into the adjacent jet and thus increasing its effective jet Reynolds number. Compared to a smooth channel configuration, the Nusselt number on the target can be increased by 5-16% without a significant change in the pressure loss. This is a purely aerodynamic effect and is not caused by increasing the area of the heat exchanging surface. The geometry represents a generic impingement cooling configuration with a row of nine inline impingement jets. All jets are influenced by a self-induced cross-flow. The jet-to-plate spacing as well as jet pitch are set to 5D and the curved U-shape ribs are installed downstream of the jet on the hole plate. The RANS simulations are performed with the SST turbulence model. The effects of different jet-to-plate spacing, jet Reynolds number as well as rib height, position and shape are investigated numerically. The effectiveness of the U-shaped turbulator is discussed in combination with additional turbulators (from the literature). This paper concludes with a recommended set of rib and impingement parameters for the usage of the U-shaped turbulator in gas turbine cooling designs. A discussion of the manufacturability by Selective Laser Melting is included

Item URL in elib:https://elib.dlr.de/199421/
Document Type:Thesis (Student thesis)
Title:A NUMERICAL ANALYSIS OF CROSS-FLOW REINFORCED IMPINGEMENT COOLING WITH A U-SHAPED FLOW-GUIDE ON THE HOLE PLATE
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Chargui, SafaeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:January 2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Heat transfer, impingment jets, RANS, turbomachinery cooling
Institution:Université Polytechnique Hauts-de-France
Department:Institut für Antriebstechnik > Turbine
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Combustion and Power Plant Systems
Location: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Deposited By: Brakmann, Robin
Deposited On:28 Nov 2023 13:35
Last Modified:04 Dec 2023 14:26

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