Abstract
As an effective and economic technique for flow range enhancement, casing treatment is widely employed to increase stability margin of compressors. In order to explore the effectiveness of casing treatment on performance of centrifugal compressor under multi-working conditions, in the present thesis, numerical analysis of three kinds of inlet recirculation casing treatment and a smooth untreated casing compressor models were carried out. The numerical results coincide well with the experimental data of optimal model and accurately predict the position of surge line, which verifies the reliability of numerical method which applied in this thesis. The results also indicate that, only reasonable configuration of the inlet recirculation casing treatment could significantly enlargement the stable operating range of the compressor at low flow rate under all rotation speeds. In addition, the slot position and front deflector baffle of the casing treatment have a great impact on its performance.
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