2013
DOI: 10.1115/1.4023471
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A Numerical Study of the Unsteady Interaction Effects on Diffuser Performance in a Centrifugal Compressor

Abstract: Interaction between rotating impeller and stationary diffuser in a centrifugal compressor is of practical importance in evaluating system performance. The present study aims at investigating how the interaction influences the unsteady diffuser performance and understanding the physical phenomena in the centrifugal compressor. A computational fluid dynamics (CFD) method has been applied to predict the flow field in the compressor, which has a conventional vaned diffuser (VD) and a low solidity vaned diffuser (L… Show more

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Cited by 20 publications
(14 citation statements)
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“…Figure 14 shows the vortex core regions (the isosurface of the swirling strength) near the leading edge of the diffuser vane for the three cases. This vortex is also observed by Anish et al (2014). As the mass flow coefficient decreases, the area of the vortex core region increases -that is to say, the strength of the vortex is enhanced.…”
Section: Impeller-diffuser Interactions (Idis)mentioning
confidence: 66%
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“…Figure 14 shows the vortex core regions (the isosurface of the swirling strength) near the leading edge of the diffuser vane for the three cases. This vortex is also observed by Anish et al (2014). As the mass flow coefficient decreases, the area of the vortex core region increases -that is to say, the strength of the vortex is enhanced.…”
Section: Impeller-diffuser Interactions (Idis)mentioning
confidence: 66%
“…The time step was taken to be the time of an impeller blade passing 1/360 of a circle. This value is the optimum time step according to Anish and Sitaram (2009) and Anish et al (2014). The 'stage' method (ANSYS, 2011a) was adopted for analyzing the IDIs for steady simulations.…”
Section: Numerical Schemementioning
confidence: 99%
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“…The increased loss may not be captured in the URANS simulation simply due to the limitations of RANS modeling, given that what is expected is an unsteady separation phenomenon. It is also possible that the effect of unsteadiness occurs at a different frequency than is allowed within a single passage, phase-lagged simulations; periodic unsteady phenomena uncorrelated to the frequency of the rotor blade passing was recently observed in work by Anish et al [25]. In summary, the hypothesis that the unsteadiness from the impeller has negligible influence on the diffuser aerodynamics is partially validated: across much of the operating range, around the best efficiency point, this is true.…”
Section: Effects Of Pitchwise Non-uniformitymentioning
confidence: 89%