Numerical Simulation of Turboexpander for Geothermal Energy ORC Power System

DOI

10.2991/icsd-17.2017.23How to use a DOI?

Keywords

Geothermal energy; ORC power system; Turboexpander; Structure optimization.

Abstract

In this study, a turboexpander for geothermal energy ORC power system was desgned. R245fa was selected as the working fuild. The factors which influence the performance of the trubine were analyzed and discussed. The software Ansys-CFX is used to perform preliminary steady-state CFD simulations. The results demonstrate that in about 30% relative chord length near the rim area, the working fluid flow direction has a greater turning direction, and there has a big produced entropy region by the local low-energy group within rim wall. The loss was further increase at the trailing edge of the impeller exit, there are several reasons to cause this phenomenon, such as the loss of low velocity flow stream, the main fluid mixing effect and part of the mechanical energy is converted to heat the working fluid. A smaller wheel diameter ratio and larger meridional flow channel width within reasonable range of values can reduce flow loss and improve the efficiency of the expander.

Copyright

© 2017, 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/).

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TY  - CONF
AU  - Bing-Cheng Liu
AU  - Xi-Bao Dong
AU  - Lu-Hang Wu
AU  - Kui Cao
AU  - Quan-Min Wang
PY  - 2017/07
DA  - 2017/07
TI  - Numerical Simulation of Turboexpander for Geothermal Energy ORC Power System
BT  - Proceedings of the 3rd 2017 International Conference on Sustainable Development (ICSD 2017)
PB  - Atlantis Press
SP  - 148
EP  - 153
SN  - 2352-5401
UR  - https://doi.org/10.2991/icsd-17.2017.23
DO  - 10.2991/icsd-17.2017.23
ID  - Liu2017/07
ER  -