Numerical analysis of Separate Vortex in the Diffuser

DOI

10.2991/icimm-16.2016.10How to use a DOI?

Keywords

centrifugal compressor; vaneless diffuser; unstablity mechanism; casing structure.

Abstract

In order to simulate the flow structure accurately and find out the inducement of unstability in a centrifugal compressor with casing structure, three different cases of models were established. By contrasting the simulation result of Case1 and Case2 with experiment data, the accuracy of grids model and turbulence model was validated. Compared with utilized a "Mixing Plane" at the Rotor-Stator interface in Case1 and Case2, the flow in diffuser of Case 3 was solved in the rotating reference frame. Compared simulation result with Case1 and Case2, the accuracy of Case3 model was validated. By studying the flow structure in diffuser, the fusion and development of the ISV result in the scope of backflow extending to blade passage, which is inducement of compressor instability. A tracing back analysis was carried out with Case3 model to investigate the formation of ISV. The blade leakage flows and strong pressure variations at outlet of blade passage were the cause of ISV.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Yong-rui Sun
AU  - Chuan-lei Yang
AU  - He-chun Wang
AU  - Xiang-huan Zu
PY  - 2016/11
DA  - 2016/11
TI  - Numerical analysis of Separate Vortex in the Diffuser
BT  - Proceedings of the 6th International Conference on Information Engineering for Mechanics and Materials
PB  - Atlantis Press
SP  - 48
EP  - 51
SN  - 2352-5401
UR  - https://doi.org/10.2991/icimm-16.2016.10
DO  - 10.2991/icimm-16.2016.10
ID  - Sun2016/11
ER  -