B3 Unrefereed conference proceedings

Modelling of Low-Reynolds-Number Centrifugal Compressors: Challenges in Performance and Flow Control Prediction


Open Access publication


Publication Details

Authors: Tiainen Jonna, Grönman Aki, Jaatinen-Värri Ahti, Backman Jari

Publication year: 2018

Language: English

Title of parent publication: Proceedings of the 6th European Conference on Computational Mechanics (ECCM 6) and 7th European Conference on Computational Fluid Dynamics (ECFD)

Start page: 490

End page: 501

Number of pages: 12

ISBN: 978-84-947311-6-7

JUFO level of this publication: 0

Open Access: Open Access publication

Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020090768798


Abstract

A low-Reynolds-number causes a performance deterioration in centrifugal compressors due to the relative increase in boundary layer thickness, tip clearance, and surface roughness. The degradation of the efficiency can be estimated by empirical correlations, and they provide a good foundation for evaluating the accuracy of the numerical models. In order to improve the compressor performance, four passive flow control methods, grooves, riblets, squealers and winglets have been proposed to be the most promising ones. However, to accurately simulate their influence on low-Reynolds-number machines, the specifi c modelling requirements should be understood. This study compares the accuracy of numerical predictions relative to an empirical correlation with a changing Reynolds number for two centrifugal compressors. In addition, challenges and possibilities in the modelling of the most promising flow control methods are analysed and discussed.


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