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  • Comparison of flow characteristics of centrifugal compressors by numerical modelling of flow
    Guzović, Zvonimir ; Baburić, Mario ; Matijašević, Dubravko
    The centrifugal impellers are used in a wide variety of turbo-machineries, ranging from low pressure fans for cooling of electric motor to high pressure ratio gas turbine compressors, from tiny ... cryo-cooler compressors to large industrial petrochemical compressor stations. The relative flow in centrifugalimpeller is very complex due to different fluid dynamics phenomenonand their interactions. It is subjected to the complex secondary flows and significant separation of the boundary layers, which result in non-uniformity of outlet flow both in tangential direction (e.g. Ćjet-wakeĆ flow) and axial direction. By the development of experimental and computational techniques the considerable progress in understanding of complexflow effects in impeller is made. The wide-spread use of reactive impellers with backswept blades in all state-of-the-art designs of compressorshas resulted in significant improvements of aero and thermodynamicscharacteristics of impeller (e.g. distribution of outlet flow velocities). The increasingly present appearance in the several recent years of calculations by means of verified and validated users software based on theengineering numerical methods enables an increasingly wide replacement of time-consuming experimental investigations (i.e. of physical modelling), whichgive a limited number of data of integral character, by mathematical modelling which gives a large number of data over a short time, enabling not only integral but also structural analysis. This results in rapid and significant improvements of aero and thermodynamics characteristics and in theend in energy conversion efficiency. The aim of the paper is to apply expert knowledge in carrying out numerical modelling of the flow in centrifugal compressor by means of users software. The algorithm is presented on the comparison of aero and thermodynamics characteristics of centrifugal compressors with reactive impellers with backswept normal and ĆSĆ shape blades. The comparison shows that the compressor with impeller with ĆSĆ shape blades has better aero and thermodynamics characteristics and thus also the energy conversion efficiency. Since there are experimental measurements of aero and thermodynamics characteristics of the numerically investigated compressors in literature, the verification and validation of the users software have been performed simultaneously. Also the alternating modelling ofthe flow and change of impeller blades geometry with the aim of improving the aero and thermodynamics characteristics up to attaining of maximum possible efficiency of energy conversion presents the algorithm of geometry optimisation of the impeller design with backswept blades.
    Vir: Strojniški vestnik = Journal of mechanical engineering. - ISSN 0039-2480 (Letn. 51, št. 7/8, 2005, str. 509-518)
    Vrsta gradiva - članek, sestavni del
    Leto - 2005
    Jezik - angleški
    COBISS.SI-ID - 8699931

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    Digitalna knjižnica Slovenije - dLib.si

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