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On the effect of inter compressor duct length on compressor performance

Dygutsch, Thomas and Kasper, Aaron and Voß, Christian (2022) On the effect of inter compressor duct length on compressor performance. The Aeronautical Journal, 126 (1302), pp. 1333-1350. Cambridge University Press. doi: 10.1017/aer.2022.51. ISSN 0001-9240.

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Official URL: https://www.cambridge.org/core/journals/aeronautical-journal/article/on-the-effect-of-inter-compressor-duct-length-on-compressor-performance/BD8CD1C848371EEE6ECA8C40B95F4C59


Compression systems of modern, civil aircraft engines consist of three components: Fan, low-pressure compressor (LPC) and high-pressure compressor (HPC). The efficiency of each component has improved over the last decades by means of rising computational power which made high level aerodynamic optimisations possible. Each component has been addressed individually and separated from the effects of upstream and downstream components. But as much time and effort has been spend to improve performance of rotating components, the stationary inter-compressor duct (ICD) has only received minor attention. With the rotating compression components being highly optimised and sophisticated their performance potential is limited. That is why more aggressive, respectively shorter, ICDs get more and more into the focus of research and engine manufacturers. The length reduction offers high weight saving and thus fuel saving potential as a shorter ICD means a reduction in aircraft engine length. This paper aims at evaluating the impact of more aggressive duct geometries on LPC and HPC performance. A multi objective 3D computational fluid dynamics (CFD) aerodynamic optimisation is performed on a preliminary design of a novel two spool compressor rig incorporating four different operating line and two near-stall (NST) conditions which ensure operability throughout the whole compressor operating range. While the ICD is free to change in length, shape and cross-section area, the blades of LPC and HPC are adjusted for changing duct aerodynamics via profile re-staggering to keep number of free parameters low. With this parametrisation length, reductions for the ICD of up to 40% are feasible while keeping the reduction in isentropic efficiency at aerodynamic design point for the compressor below 1%pt. Three geometries of the Pareto front are analysed in detail focusing on ICD secondary flow behaviour and changes of aerodynamics in LPC and HPC. In order to asses changes in stall margin, speedlines for the three geometries are analysed.

Item URL in elib:https://elib.dlr.de/187916/
Document Type:Article
Title:On the effect of inter compressor duct length on compressor performance
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dygutsch, ThomasUNSPECIFIEDhttps://orcid.org/0000-0001-9679-5124UNSPECIFIED
Date:23 May 2022
Journal or Publication Title:The Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1333-1350
Publisher:Cambridge University Press
Keywords:Axial compressor; Inter-compressor duct; Aerodynamics; Optimisation; low-pressure compressor; high-pressure compressor
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Components and Emissions
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Dygutsch, Thomas
Deposited On:22 Aug 2022 13:46
Last Modified:29 Aug 2022 09:43

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