Analysis of Secondary Flows in Centrifugal Impellers

Brun, Klaus; Kurz, Rainer

doi:10.1155/ijrm.2005.45

Cited by 40 publications

(16 citation statements)

References 26 publications

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“…This lateral recirculating flow is called a secondary (or Dean) flow 18 – 20 . Formation of Dean flow in curved and spiral channels is inevitable, yet their presence may be dominant and useful in some applications 21 – 23 while undesirable in others 24 , 25 .…”

Section: Introductionmentioning

confidence: 99%

Semi-Empirical Estimation of Dean Flow Velocity in Curved Microchannels

Bayat

Rezai

2017

Sci Rep

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Curved and spiral microfluidic channels are widely used in particle and cell sorting applications. However, the average Dean velocity of secondary vortices which is an important design parameter in these devices cannot be estimated precisely with the current knowledge in the field. In this paper, we used co-flows of dyed liquids in curved microchannels with different radii of curvatures and monitored the lateral displacement of fluids using optical microscopy. A quantitative Switching Index parameter was then introduced to calculate the average Dean velocity in these channels. Additionally, we developed a validated numerical model to expand our investigations to elucidating the effects of channel hydraulic diameter, width, and height as well as fluid kinematic viscosity on Dean velocity. Accordingly, a non-dimensional comprehensive correlation was developed based on our numerical model and validated against experimental results. The proposed correlation can be used extensively for the design of curved microchannels for manipulation of fluids, particles, and biological substances in spiral microfluidic devices.

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Section: Introductionmentioning

confidence: 99%

Semi-Empirical Estimation of Dean Flow Velocity in Curved Microchannels

Bayat

Rezai

2017

Sci Rep

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“…The Reynolds number or the Ross by number has significant impacts on the impeller maximum surplus value. Fundamental fluid dynamics theory [37,38] shows that the flow inside a pipe for a different Reynolds number represents different flow patterns. This is also true for flow inside impeller blades.…”

Section: Reynolds Number and Surface Finishmentioning

confidence: 99%

Empirical Design Considerations for Industrial Centrifugal Compressors

Amano

2012

International Journal of Rotating Machinery

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Computational Fluid Dynamics (CFD) has been extensively used in centrifugal compressor design. CFD provides further optimisation opportunities for the compressor design rather than designing the centrifugal compressor. The experience-based design process still plays an important role for new compressor developments. The wide variety of design subjects represents a very complex design world for centrifugal compressor designers. Therefore, some basic information for centrifugal design is still very important. The impeller is the key part of the centrifugal stage. Designing a highly efficiency impeller with a wide operation range can ensure overall stage design success. This paper provides some empirical information for designing industrial centrifugal compressors with a focus on the impeller. A ported shroud compressor basic design guideline is also discussed for improving the compressor range.

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“…In Brun [3], a secondary flow model was derived applying known meridional velocities to the streamwise vorticity equations to determine the vorticity. Since different values of exducer width b 2 will alternate the meridional velocity (to satisfy the continuity equation), b 2 will indirectly effect the streamwise vorticity coming from the non-uniform flow in the hub to shroud direction during rotation of the impeller shaft [3].…”

Section: Eq(4)mentioning

confidence: 99%

Numerical Investigation of the Effect of Different Back Sweep Angle and Exducer Width on the Impeller Outlet Flow Pattern of a Centrifugal Compressor With Vaneless Diffuser

Hildebrandt

Genrup

2006

Volume 6: Turbomachinery, Parts a and B

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This paper presents a numerical investigation of the effect of different back sweep angles and exducer widths on the steady-state impeller outlet flow pattern of a centrifugal compressor with a vaneless diffuser. The investigations have been performed with commercial CFD and in-house programmed 1-D codes. CFD calculations aim to investigate how flow pattern from the impeller is quantitatively influenced by compressor geometry parameters; thereby, the location of wake and its magnitude (flow angle and relative velocity magnitude) are analyzed. Results show that the increased back sweep impeller provides a more uniform flow pattern in terms of velocity and flow deviation angle distribution, and offers better potential for the diffusion process inside a vaneless (or vaned) diffuser. Secondary flux fraction and flow deviation angle from CFD simulation are implemented into the 1-D two-zone program to improve 1-D prediction results.

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Analysis of Secondary Flows in Centrifugal Impellers

Cited by 40 publications

References 26 publications

Semi-Empirical Estimation of Dean Flow Velocity in Curved Microchannels

Semi-Empirical Estimation of Dean Flow Velocity in Curved Microchannels

Empirical Design Considerations for Industrial Centrifugal Compressors

Numerical Investigation of the Effect of Different Back Sweep Angle and Exducer Width on the Impeller Outlet Flow Pattern of a Centrifugal Compressor With Vaneless Diffuser

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