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Indexed by:期刊论文

Date of Publication:2014-03-01

Journal:Energy Education Science and Technology Part A: Energy Science and Research

Included Journals:EI、Scopus

Volume:32

Issue:2

Page Number:1085-1092

ISSN No.:1308772X

Abstract:Centrifugal compressors are vital energy conversion equipment and widely used in Petrochemical industries. The flow complex and unsteady features in compressor stage have an impact on the safety of compressor operating. The transient flow characteristics were numerically simulated in the semi-open impeller stage of one large compressor. By using the phase lagged method and the domain scaling method, two different interface approaches, and solving the three dimensional density-based Reynoldsaveraged N-S equation, the static pressure fluctuation on the impeller blades surface was obtained. The flow in the impeller was analyzed according to the dynamic load characteristics of the impeller blades surface, and then the difference between the domain scaling method and the phase lagged method was discussed and summarized. Theoretical studies show that the dynamic load is the incentive of fatigue failure of compressor impellers. The numerical results indicate that the dynamic load on the studied impeller blades surface is much lower than that inducing fatigue failure. The conclusions of this study provide the numerical basis for the choice of suitable method for numerical simulation of transient flow in the centrifugal compressor stage, and as well as the guidance for the reason investigation of impeller blades fracture under off-operating conditions. ? Sila Science.