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Edition and Publication:
< Natural Gas and Oil > Editorial Department
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China Petroleum Engineering & Construction Corporation Southwest Company
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China Petroleum Engineering & Construction Corporation
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Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
CN 51-1183/TE

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Research on Operation of Centrifugal Compressors in Choke Conditions

Author of the article:Rainer Kurz, Russell K Marechale, Edward J Fowler, Min Ji, Michael J Cave

Author's Workplace：Solar Turbines Incorporated

Key Words：Centrifugal compressor; Off-design aerodynamics; Axial thrust; Excitation

Abstract：Centrifugal compressors are at times required to operate in or near the choke region. Various limits of the degree of allowable operation in choke have been established. Based on test data and numerical data, the behavior of centrifugal compressors in the choke region is studied. Changes in aerodynamic performance, thrust load, volute behavior and radial loading are considered. The issue of excitation of impeller vanes is addressed. Particular consideration is given to multistage machines, as well as dual compartment machines, in particular regarding the effects of impeller mismatch during operating conditions at flows significantly higher than the design flow. Limitations in the overload operating range of a compressor not only impact the operational flexibility, but also can require more complicated control systems. The paper addresses aerodynamic, structural as well as rotor-dynamic issues related to the operation in choke. It indicate some general features of centrifugal compressor should be or not be operated in choke.