PIV validation of different turbulence models used for numerical simulation of a centrifugal pump diffuser
Abstract
Purpose
The purpose of this study is to validate the different turbulence models using in the numerical simulation of centrifugal pump diffuser. Computational fluid dynamics (CFD) has become the main method to study the pump inner flow patterns. It is important to understand the differences and features of the different turbulence models used in turbomachinery.
Design/methodology/approach
The velocity flow fields in a compact return diffuser under different flow conditions are studied and compared between CFD and particle image velocimetry (PIV) measurements. Three turbulence models are used to solve the steady flow field using high-quality fine structured grids, including shear stress transport (SST) k-w model, detached-eddy simulation (DES) model and SST k-w model with low-Re corrections.
Findings
SST k-w model with low-Re correction gives better results compared to DES and SST k-w model, and gives a good predication about the vortex core position under strong part-loading conditions.
Originality/value
A special test rig is designed to carry out the 2D PIV measurements under high rotating speed of 2850 r/min, and the PIV results are used to validate the CFD results.
Keywords
Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant No. 51609106), Natural Science Foundation of Jiangsu Province (Grant No. BK20150508), Jiangsu Province Universities Natural Sciences Foundation (Grant No. 15KJB570001), China Postdoctoral Science Foundation (Grant No. 2015M581737 and 2017T100331), Jiangsu Planned Projects for Postdoctoral Research Funds (Grant No. 1501069A) and Senior Personnel Foundation of Jiangsu University (Grant No. 15JDG047).
Citation
Zhou, L., Bai, L., Li, W., Shi, W. and Wang, C. (2018), "PIV validation of different turbulence models used for numerical simulation of a centrifugal pump diffuser", Engineering Computations, Vol. 35 No. 1, pp. 2-17. https://doi.org/10.1108/EC-07-2016-0251
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited