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High-dimensional multi-fidelity optimisation of a 2.5 stage low pressure compressor

Hemmert-Pottmann, Stefan and Forsthofer, Nicolai and Voß, Christian and Schneider, Tim (2019) High-dimensional multi-fidelity optimisation of a 2.5 stage low pressure compressor. In: ISABE. ISABE 2019, 22.-27. Sep. 2019, Canberra, Australien.

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Abstract

The low pressure compressor in modern jet engines has to meet high demands in performance and needs to operate in various conditions. Moreover, the low pressure compressor of an embedded engine has to deal with a distorted inflow, which makes it necessary to take a sufficient surge margin into account during design phase. These requirements become even more challenging, when weight restrictions lead to a narrow installation space. In this paper the multi-disciplinary design optimisation of a highly loaded 2.5 stage low pressure compressor with 264 free parameters under challenging constraints is presented. The automated optimiser AutoOpti, developed at DLR’s Institute of Propulsion Technology, is used to carry out the multi-fidelity optimisation. The aim of the optimisation is the improvement of isentropic efficiency and surge margin with the simultaneous fulfilment of geometric, aerodynamic and mechanical constraints. More than 25 constraints were active at the same time, which leads to great challenges for the optimisation procedure. The final design fulfils all aerodynamic and mechanical constraints. The main part of the optimisation had to be spent on the fulfilment of these constraints, because the initial geometry did not fulfil most of them. The isentropic efficiencies of the optimised final geometry is slightly improved at design speed compared to the initial geometry (about 1%), while at part speed the increase is about 3%. The drawback is that the surge margin could not be conserved with a drop of 2.5 and 2.9 percentage points respectively at the two considered rotational speeds.

Item URL in elib:https://elib.dlr.de/129783/
Document Type:Conference or Workshop Item (Speech)
Title:High-dimensional multi-fidelity optimisation of a 2.5 stage low pressure compressor
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hemmert-Pottmann, Stefanstefan.hemmert-pottmann (at) dlr.dehttps://orcid.org/0000-0003-1397-750X
Forsthofer, NicolaiNicolai.Forsthofer (at) dlr.deUNSPECIFIED
Voß, ChristianChristian.Voss (at) dlr.deUNSPECIFIED
Schneider, TimMTU Aero Engines AGUNSPECIFIED
Date:2019
Journal or Publication Title:ISABE
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:optimisation, multi-fidelity, multidisciplinary, constraints, low pres- sure compressor
Event Title:ISABE 2019
Event Location:Canberra, Australien
Event Type:international Conference
Event Dates:22.-27. Sep. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Institute of Structures and Design > Design and Manufacture Technologies
Deposited By: Hemmert-Pottmann, Stefan
Deposited On:18 Nov 2019 12:26
Last Modified:12 Dec 2019 09:43

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