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http://dx.doi.org/10.9726/kspse.2012.16.5.055

Study on performance prediction of centrifugal compressor with diffuser angle and rotational speed change  

Park, Y.H. (Graduate School, Gyeongsang National University)
Shim, Y.H. (Division of Turbo-charger, SamJeong Turbine Co. Ltd.)
Kim, C.S. (Department of Mechanical Engineering, ChangWon National University)
Cho, S.Y. (Research Center for Aircraft Parts Technology, Gyeongsang National University)
Publication Information
Journal of Power System Engineering / v.16, no.5, 2012 , pp. 55-62 More about this Journal
Abstract
Centrifugal compressors are widely used and each operating condition is different. However, it cannot be manufactured according to the every operating condition. In the this study, performance of compressor was evaluated with various rotational speeds of impeller and various stagger angles of diffuser in order to apply a typical model widely. A centrifugal compressor was designed and manufactured based on the design point. On this machines, an experiment was conducted and the performance was predicted at off-design point. The performance prediction was validated with the experimental result and the numerical result. Although the isentropic efficiency on the prediction was slightly lower than that on the experimental result due to the heat loss in the experiment, the pressure ratio was predicted well and also the predicted results were matched well with the numerical results. When the rotational speed of the impeller and the stagger angle of the diffuser were changed together, the compressor can be worked in the high efficiency region and avoided operating in the stall region.
Keywords
Centrifugal Compressor; Off-Design Point; Diffuser Control; Performance Prediction; Impeller Design;
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