A Comparison of Single-Entry and Multiple-Entry Casing Impingement Manifolds for Active Thermal Tip Clearance Control

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dc.contributor.author Dhopade, Priyanka
dc.contributor.author Kirollos, Benjamin
dc.contributor.author Ireland, Peter
dc.contributor.author Lewis, Leo
dc.date.accessioned 2021-08-15T22:45:18Z
dc.date.available 2021-08-15T22:45:18Z
dc.date.issued 2021-5-14
dc.identifier.citation International Journal of Turbomachinery Propulsion and Power 6(2):10 14 May 2021
dc.identifier.issn 2504-186X
dc.identifier.uri https://hdl.handle.net/2292/56022
dc.description.abstract <jats:p>In this paper, we compare using computational fluid dynamics the aero-thermal performance of two candidate casing manifolds for supplying an impingement-actuated active tip clearance control system for an aero-engine high-pressure turbine. The two geometries are (a) single-entry: an annular manifold fed at one circumferential location; (b) multiple-entry: a casing manifold split into four annular sectors, with each sector supplied separately from an annular ring main. Both the single-entry and multiple-entry systems analysed in this paper are idealised versions of active clearance control systems in current production engines. Aero-thermal performance is quantitatively assessed on the basis of the heat transfer coefficient distribution, driving temperature difference for heat transfer between the jet and casing wall and total pressure loss within the high-pressure turbine active clearance control system. We predict that the mean heat transfer coefficient (defined with respect to the inlet temperature and local wall temperature) of the single-entry active clearance control system is 77% greater than the multiple-entry system, primarily because the coolant in the multiple-entry case picks up approximately 40 K of temperature from the ring main walls, and secondarily because the average jet Reynolds number of impingement holes in the single-entry system is 1.2 times greater than in the multiple-entry system. The multiple-entry system exhibits many local hot and cold spots, depending on the position of the transfer boxes, while the single-entry case has a more predictable aero-thermal field across the system. The multiple-entry feed system uses an average of 20% of the total available pressure drop, while the feed system for the single-entry geometry uses only 2% of the total available pressure drop. From the aero-thermal results of this computational study, and in consideration of holistic aero-engine design factors, we conclude that a single-entry system is closer to an optimal solution than a multiple-entry system.</jats:p>
dc.language en
dc.publisher MDPI AG
dc.relation.ispartofseries International Journal of Turbomachinery Propulsion and Power
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject Science & Technology
dc.subject Technology
dc.subject Engineering, Aerospace
dc.subject Engineering, Mechanical
dc.subject Engineering
dc.subject impingement
dc.subject heat transfer
dc.subject manifold
dc.subject tip clearance
dc.subject active flow control
dc.subject gas turbine
dc.subject single entry
dc.subject multiple entry
dc.subject secondary flow
dc.subject internal flow
dc.subject HEAT-TRANSFER
dc.title A Comparison of Single-Entry and Multiple-Entry Casing Impingement Manifolds for Active Thermal Tip Clearance Control
dc.type Journal Article
dc.identifier.doi 10.3390/ijtpp6020010
pubs.issue 2
pubs.begin-page 10
pubs.volume 6
dc.date.updated 2021-07-19T01:47:39Z
dc.rights.holder Copyright: The author en
pubs.author-url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000667258400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=6e41486220adb198d0efde5a3b153e7d
pubs.publication-status Published online
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en
pubs.subtype Article
pubs.subtype Journal
pubs.elements-id 853269
dc.identifier.eissn 2504-186X
pubs.number ARTN 10
pubs.online-publication-date 2021-5-14

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