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An Iterative Method to Derive the Equivalent Centrifugal Compressor Performance at Various Operating Conditions: Part I: Modelling of Suction Parameters Impact

School of Aerospace, Transport and Manufacturing, Cranfield University, Bedfordshire MK43 0AL, UK
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Academic Editor: Chang Sik Lee
Energies 2015, 8(8), 8497-8515; https://doi.org/10.3390/en8088497
Received: 3 July 2015 / Revised: 4 August 2015 / Accepted: 6 August 2015 / Published: 12 August 2015
This paper introduces a new iterative method to predict the equivalent centrifugal compressor performance at various operating conditions. The presented theoretical analysis and empirical correlations provide a novel approach to derive the entire compressor map corresponding to various suction conditions without a prior knowledge of the detailed geometry. The efficiency model was derived to reflect the impact of physical gas properties, Mach number, and flow and work coefficients. One of the main features of the developed technique is the fact that it considers the variation in the gas properties and stage efficiency which makes it appropriate with hydrocarbons. This method has been tested to predict the performance of two multistage centrifugal compressors and the estimated characteristics are compared with the measured data. The carried comparison revealed a good matching with the actual values, including the stable operation region limits. Furthermore, an optimization study was conducted to investigate the influences of suction conditions on the stage efficiency and surge margin. Moreover, a new sort of presentation has been generated to obtain the equivalent performance characteristics for a constant discharge pressure operation at variable suction pressure and temperature working conditions. A further validation is included in part two of this study in order to evaluate the prediction capability of the derived model at various gas compositions. View Full-Text
Keywords: new iterative method; centrifugal compressor performance; operating conditions; physical gas properties; hydrocarbons; stable operation region limits new iterative method; centrifugal compressor performance; operating conditions; physical gas properties; hydrocarbons; stable operation region limits
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Albusaidi, W.; Pilidis, P. An Iterative Method to Derive the Equivalent Centrifugal Compressor Performance at Various Operating Conditions: Part I: Modelling of Suction Parameters Impact. Energies 2015, 8, 8497-8515.

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