High-speed stereoscopic PIV study of rotating instabilities in a radial vaneless diffuser

Dazin, Antoine; Cavazzini, Giovanna; Pavesi, Giorgio; Dupont, Patrick; Coudert, Sébastien; Ardizzon, Guido; Caignaert, Guy; Bois, Gérard

doi:10.1007/s00348-010-1030-x

Cited by 55 publications

(32 citation statements)

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“…They employed a two equation isotropic turbulence model. The numerical result was found in good agreement with observed pressure fluctuations and number of rotating stall cells as compared with particle imaging velocimety (PIV), see [13]. However, it was concluded that the numerical result using isotropic turbulence modeling underestimates the strength of the rotating stall vortex as compared with PIV measurements.…”

Section: Introductionsupporting

confidence: 66%

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

Sundström

Mihăescu

Giachi³

et al. 2017

IJTPP

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Abstract:Numerical simulations based on the large eddy simulation approach were conducted with the aim to explore vaneless diffuser rotating stall instability in a centrifugal compressor. The effect of the impeller blade passage was included as an inlet boundary condition with sufficiently low flow angle relative to the tangent to provoke the instability and cause circulation in the diffuser core flow. Flow quantities, velocity and pressure, were extracted to accumulate statistics for calculating mean velocity and mean Reynolds stresses in the wall-to-wall direction. The paper focuses on the assessment of the complex response of the system to the velocity perturbations imposed, the resulting pressure gradient and flow curvature effects.

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Section: Introductionsupporting

confidence: 66%

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

Sundström

Mihăescu

Giachi³

et al. 2017

IJTPP

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“…(2) Experimental researches (for example: PIV study-Wuibaut, Dupont, Bois, Caignaert, & Stanislas, 2002;Krause, Zähringer, & Pap, 2005;Pavesi et al, 2011;Dazin et al, 2008Dazin et al, , 2011 and numerical analyses are quite numerous in open literature. The main research contents of rotating stall were focused on several aspects: i.…”

Section: Introductionmentioning

confidence: 99%

A study of rotating stall in a vaneless diffuser of radial flow pump

Heng¹,

Ouarzazi²,

2018

Journal of Hydraulic Research

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Rotating stall in a vaneless diffuser of radial flow pump is studied. The measurements have consisted of: i/ unsteady pressure measurements delivered by two microphones, ii/ 9 steady pressure taps mounted in one radial line to measure the pressure recovery in the vaneless diffuser. Spectrum analysis was used to identify and characterize rotating stall. An assumption was made to estimate the losses in the vaneless diffuser to evaluate the effect of the instability development on its performance. The result has shown that the arising of rotating stall has a positive effect on the diffuser performance. Two possible reasons are proposed: 1. A blockage in the diffuser due to the unstable cells which shortens the streamlines and decreased the friction losses along the vaneless diffuser. 2. The topology of rotating stall cells results in the convection of fluid coming from outside part of the pump model to the vaneless diffuser.

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“…Details on PIV techniques used, experimental setup, and result interpretations can be found in the Ref. [19]. The experimental procedure allowed the determination of the mean absolute velocities for up to 7 impeller angular positions relative to diffuser vanes, as shown in Fig.…”

Section: Comparison With Piv Measurementmentioning

confidence: 99%

Static pressure recovery analysis in the vane island diffuser of a centrifugal pump

Dupont

Bayeul-Lainé

et al. 2016

J Mech Sci Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID AbstractThe overall performance of a vane-island type diffuser of a centrifugal pump model was obtained by means of directional probe traverses. These measurements were performed in an air model of a real hydraulic pump for five volume flow rates. Directional probe traverses are performed with a classical three-hole probe to cover most of the complete inlet section of the diffuser from hub to shroud and from pressure to suction side. Existing Particle image velocimetry (PIV) measurement results are also used to compare probe measurement results between the inlet and outlet throats of vane island diffuser at mid-span. Some assistance from already existing unsteady calculation, including leakage effects, is used to evaluate the numerical approach capability and to correctly define the mean initial conditions at impeller's outlet section. Pressure recovery and the measured total pressure loss levels inside this particular vane diffuser geometry are then calculated. Detailed analysis of the flow structure at the inlet section of the vane island diffuser is presented to focus on pressure evolution inside the entire diffuser section for different flow rates. The combined effects of incidence angle and blockage distributions along hub to shroud direction are found to play an important role on loss distribution in such a diffuser.

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High-speed stereoscopic PIV study of rotating instabilities in a radial vaneless diffuser

Cited by 55 publications

References 50 publications

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

A study of rotating stall in a vaneless diffuser of radial flow pump

Static pressure recovery analysis in the vane island diffuser of a centrifugal pump

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