Vaneless diffuser core flow instability and rotating stall characteristics

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Abstract

Since rotating stall in centrifugal compressors limits the operating range and causes damage and noise nuisance it must be avoided. To widen the operating range more knowledge on flow dynamics of rotating stall mechanism is required. To study the vaneless diffuser rotating stall two-dimensional flow model is used where the influence of the wall boundary layers is neglected. At the diffuser inlet rotating jet-wake velocity is prescribed and at the outlet constant static pressure is assumed. Under these conditions a two-dimensional rotating instability is observed, which is studied in terms of the rotating stall frequencies and pressure fluctuations.
Original languageEnglish
Title of host publication9th European Fluid Machinery Congress : applying the latest technology to new and existing process equipment 23-26 April 2006, The Hague, The Netherlands
Place of PublicationNetherlands, The Hague
Pages13-
Publication statusPublished - 2006

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