Active subspaces for the preliminary fluid dynamic design of unconventional turbomachinery

J.S. Bahamonde Noriega, Matteo Pini, P. Colonna di Paliano

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

39 Downloads (Pure)

Abstract

The fluid dynamic preliminary design of unconventional turbomachinery is customary done with meanline design procedures coupled with gradient-free optimizers. This method features various drawbacks, since it might become computationally expensive, and it does not provide design insights or guidelines to the designer. This work proposes a strategy to abate this disadvantages, namely, the construction of a reduced-order model by means of active sub-spaces, and the use of the surrogate combined with a gradient-based optimizer. The case study is the design optimization of a Organic Rankine Cycle radial inflow turbine. The results show that active subspaces exist for this application, and that it is possible to construct a surrogate with an approximate error of ±1% for the total-to-static efficiency. Additionally, the optimization using the surrogate leads to accurate results and a computational cost at least four times faster. Furthermore, the results reveal that the models for unconventional turbomachinery feature multiple regions containing constrained optima. Active subspace methods thus prove to be a promising alternative for optimization of unconventional turbomachinery.

Original languageEnglish
Title of host publicationECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering
PublisherNational Technical University of Athens
Pages8572-8586
Number of pages15
Volume4
ISBN (Electronic)9786188284401
Publication statusPublished - 2016
Event7th European Congress on Computational Methods in Applied Sciences and Engineering - Crete, Greece
Duration: 5 Jun 201610 Jun 2016
Conference number: 7
https://www.eccomas2016.org/

Conference

Conference7th European Congress on Computational Methods in Applied Sciences and Engineering
Abbreviated titleECCOMAS Congress 2016
CountryGreece
CityCrete
Period5/06/1610/06/16
Internet address

Keywords

  • Active subspaces
  • Organic rankine cycle
  • Surrogate models
  • Turbine design

Fingerprint Dive into the research topics of 'Active subspaces for the preliminary fluid dynamic design of unconventional turbomachinery'. Together they form a unique fingerprint.

Cite this