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NORMA Résumé de rapport

Project ID: G3RD-CT-2001-00393
Financé au titre de: FP5-GROWTH
Pays: Sweden

Experimental multivariate analyses and design for lowering hydrodynamic noise in mixed flow pumps

A systematic way of measuring the hydrodynamic noise impacts in water jets, such that post processing can lead to the most optimised solution. A method used for aero engines was intended, however because of manufacturing difficulties only 4 prototypes was manufactured which is to low number for a multivariate data analyses.

The method was replaced by a reanalysing the pressure fields by CFD. It was found that the coherence was extremely constructive in the guidevane part, therefore all efforts was concentrated upon decrementing the ampliyudes in the guidevane-part. A number of candidates for softer interaction between rotor and stator were suggested. A CFD test for performance acceptance outraged four candidates.

The result of the best choice was a significant reduction of vibrations. 14dB.

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Varnumsleden 5
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