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International Journal of Rotating Machinery
Volume 2017, Article ID 4690590, 11 pages
https://doi.org/10.1155/2017/4690590
Research Article

Aerodynamic Optimization Design of a Multistage Centrifugal Steam Turbine and Its Off-Design Performance Analysis

1School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer, Shanghai 200093, China

Correspondence should be addressed to Dian-Gui Huang; nc.ude.tssu@gnauhgd

Received 8 April 2017; Revised 28 June 2017; Accepted 7 August 2017; Published 27 September 2017

Academic Editor: Ryoichi Samuel Amano

Copyright © 2017 Hui Li and Dian-Gui Huang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Centrifugal turbine which has less land occupation, simple structure, and high aerodynamic efficiency is suitable to be used as small to medium size steam turbines or waste heat recovery plant. In this paper, one-dimensional design of a multistage centrifugal steam turbine was performed by using in-house one-dimensional aerodynamic design program. In addition, three-dimensional numerical simulation was also performed in order to analyze design and off-design aerodynamic performance of the proposed centrifugal steam turbine. The results exhibit reasonable flow field and smooth streamline; the aerodynamic performance of the designed turbine meets our initial expectations. These results indicate that the one-dimensional aerodynamic design program is reliable and effective. The off-design aerodynamic performance of centrifugal steam turbine was analyzed, and the results show that the mass flow increases with the decrease of the pressure ratio at a constant speed, until the critical mass flow is reached. The efficiency curve with the pressure ratio has an optimum efficiency point. And the pressure ratio of the optimum efficiency agrees well with that of the one-dimensional design. The shaft power decreases as the pressure ratio increases at a constant speed. Overall, the centrifugal turbine has a wide range and good off-design aerodynamic performance.