Design of a novel axial impeller as a part of counter-rotating axial compressor to compress water vapor as refrigerant

Qubo Li , Janusz Piechna , Norbert Müller

Abstract

A systematic investigation to understand the use of a novel axial impeller as a part of counter-rotating axial compressor to compress water vapor as refrigerant was undertaken. Blade angle was investigated at first to understand this novel impeller’s geometry. A commercial CFD package, which solves the Reynolds-averaged Navier–Stokes equations, was used to compute the complex flow field of the impeller. Two hub/shroud tip ratios with different speed ratios were numerically simulated. The numerical simulation focused on the water vapor flow from compressor impeller inlet to outlet and the overall performance level and range were predicted. The numerical investigation revealed that at hub/shroud tip ratio of 0.54, maximum pressure ratio reached about 1.24 with isentropic efficiency around 75\% at its design point. Detailed investigation into flow structure showed that a serious secondary flow exists between span ranges of 30–50\%. An enlargement of hub/shroud tip ratio to 0.75 showed that pressure ratio had been improved significantly. By comparing different speed ratios and hub/shroud tip ratios, the study shows potential to utilize this novel axial impeller to compress water vapor as refrigerant.
Author Qubo Li
Qubo Li,,
-
, Janusz Piechna ITLMS
Janusz Piechna,,
- The Institute of Aeronautics and Applied Mechanics
, Norbert Müller
Norbert Müller,,
-
Journal seriesApplied Energy, ISSN 0306-2619
Issue year2011
Vol88
No9
Pages3156-3168
Keywords in EnglishAerodynamic, Axial impeller, Computational fluid dynamics, Counter rotating
DOIDOI:10.1016/j.apenergy.2011.02.024
URL http://www.sciencedirect.com/science/article/pii/S0306261911001231
Score (nominal)40
Publication indicators WoS Impact Factor: 2011 = 5.106 (2) - 2011=4.456 (5)
Citation count*4 (2015-12-02)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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