Multipoint Shape Optimisation of an Automotive Radial Compressor Using a Coupled Computational Fluid Dynamics and Genetic Algorithm Approach

Research output: Contribution to journalArticle

Abstract

Automotive turbochargers operate over a wide range and require
high efficiencies and pressure ratios. These conflicting requirements and a myriad of design parameters render iterative design techniques unfeasible. However, over the last decades the combination of numerical flow solvers and evolutionary algorithms has established itself as a viable option in the pursuit of reaching desired performance characteristics.This study seeks to perform a three-dimensional, multipoint and multiobjective optimisation of an automotive radial compressor by modifying blade shape as well as the meridional contour of the flow path. The method couples steady-state computational fluid dynamics (CFD) with a genetic algorithm (GA) to maximise isentropic efficiency in the region close to surge, while ensuring no significant reduction in choke margin. The results of two optimisation studies are presented and a flow-field analysis based on entropy generation rate is carried out revealing regions of flow improvement. The results are further compared against experimental data, indicating good agreement between the numerical and test data. The experiments however imply a detrimental impact on the surge margin for larger impeller speeds, which is attributed to unfavourable blade loading. Two
additional optimisation runs are presented mitigating the effect of
loading unbalance between main blade and splitter.
Original languageEnglish
Article numberEGY-D-18-01485
Pages (from-to)543-561
JournalEnergy
Publication statusPublished - 15 Dec 2018

Fingerprint

Shape optimization
Compressors
Computational fluid dynamics
Genetic algorithms
Electric inductors
Multiobjective optimization
Evolutionary algorithms
Turbomachine blades
Flow fields
Entropy
Experiments

Cite this

@article{52bd4f5cea3d4cc490a268240e4bb4e9,
title = "Multipoint Shape Optimisation of an Automotive Radial Compressor Using a Coupled Computational Fluid Dynamics and Genetic Algorithm Approach",
abstract = "Automotive turbochargers operate over a wide range and requirehigh efficiencies and pressure ratios. These conflicting requirements and a myriad of design parameters render iterative design techniques unfeasible. However, over the last decades the combination of numerical flow solvers and evolutionary algorithms has established itself as a viable option in the pursuit of reaching desired performance characteristics.This study seeks to perform a three-dimensional, multipoint and multiobjective optimisation of an automotive radial compressor by modifying blade shape as well as the meridional contour of the flow path. The method couples steady-state computational fluid dynamics (CFD) with a genetic algorithm (GA) to maximise isentropic efficiency in the region close to surge, while ensuring no significant reduction in choke margin. The results of two optimisation studies are presented and a flow-field analysis based on entropy generation rate is carried out revealing regions of flow improvement. The results are further compared against experimental data, indicating good agreement between the numerical and test data. The experiments however imply a detrimental impact on the surge margin for larger impeller speeds, which is attributed to unfavourable blade loading. Twoadditional optimisation runs are presented mitigating the effect ofloading unbalance between main blade and splitter.",
author = "Stefan Tuechler and Zhihang Chen and Colin Copeland",
year = "2018",
month = "12",
day = "15",
language = "English",
pages = "543--561",
journal = "Energy",
issn = "0360-5442",
publisher = "Elsevier",

}

TY - JOUR

T1 - Multipoint Shape Optimisation of an Automotive Radial Compressor Using a Coupled Computational Fluid Dynamics and Genetic Algorithm Approach

AU - Tuechler, Stefan

AU - Chen, Zhihang

AU - Copeland, Colin

PY - 2018/12/15

Y1 - 2018/12/15

N2 - Automotive turbochargers operate over a wide range and requirehigh efficiencies and pressure ratios. These conflicting requirements and a myriad of design parameters render iterative design techniques unfeasible. However, over the last decades the combination of numerical flow solvers and evolutionary algorithms has established itself as a viable option in the pursuit of reaching desired performance characteristics.This study seeks to perform a three-dimensional, multipoint and multiobjective optimisation of an automotive radial compressor by modifying blade shape as well as the meridional contour of the flow path. The method couples steady-state computational fluid dynamics (CFD) with a genetic algorithm (GA) to maximise isentropic efficiency in the region close to surge, while ensuring no significant reduction in choke margin. The results of two optimisation studies are presented and a flow-field analysis based on entropy generation rate is carried out revealing regions of flow improvement. The results are further compared against experimental data, indicating good agreement between the numerical and test data. The experiments however imply a detrimental impact on the surge margin for larger impeller speeds, which is attributed to unfavourable blade loading. Twoadditional optimisation runs are presented mitigating the effect ofloading unbalance between main blade and splitter.

AB - Automotive turbochargers operate over a wide range and requirehigh efficiencies and pressure ratios. These conflicting requirements and a myriad of design parameters render iterative design techniques unfeasible. However, over the last decades the combination of numerical flow solvers and evolutionary algorithms has established itself as a viable option in the pursuit of reaching desired performance characteristics.This study seeks to perform a three-dimensional, multipoint and multiobjective optimisation of an automotive radial compressor by modifying blade shape as well as the meridional contour of the flow path. The method couples steady-state computational fluid dynamics (CFD) with a genetic algorithm (GA) to maximise isentropic efficiency in the region close to surge, while ensuring no significant reduction in choke margin. The results of two optimisation studies are presented and a flow-field analysis based on entropy generation rate is carried out revealing regions of flow improvement. The results are further compared against experimental data, indicating good agreement between the numerical and test data. The experiments however imply a detrimental impact on the surge margin for larger impeller speeds, which is attributed to unfavourable blade loading. Twoadditional optimisation runs are presented mitigating the effect ofloading unbalance between main blade and splitter.

M3 - Article

SP - 543

EP - 561

JO - Energy

JF - Energy

SN - 0360-5442

M1 - EGY-D-18-01485

ER -