Rotating instability in the vaneless diffuser of a radial flow pump

Dazin, Antoine; Coutier-Delgosha, Olivier; Dupont, Patrick; Coudert, Sébastien; Caignaert, Guy; Bois, Gérard

doi:10.1007/s11630-008-0368-3

Cited by 23 publications

(27 citation statements)

References 13 publications

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“…At partial load and in particular at 0.26 Q des , previous analyses showed that a rotating instability developed in the vaneless diffuser [Dazin et al, 2008].…”

Section: Constant Angular Velocity Phenomenamentioning

confidence: 97%

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Post-Processing Methods of PIV Instantaneous Flow Fields for Unsteady Flows in Turbomachines

Cavazzini¹,

Pavesi²,

Dupont³

et al. 2012

The Particle Image Velocimetry - Characteristics, Limits and Possible Applications

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The Particle Image Velocimetry is undoubtedly one of the most important technique in Fluid-dynamics since it allows to obtain a direct and instantaneous visualization of the flow field in a non-intrusive way. This innovative technique spreads in a wide number of research fields, from aerodynamics to medicine, from biology to turbulence researches, from aerodynamics to combustion processes. The book is aimed at presenting the PIV technique and its wide range of possible applications so as to provide a reference for researchers who intended to exploit this innovative technique in their research fields. Several aspects and possible problems in the analysis of large- and micro-scale turbulent phenomena, two-phase flows and polymer melts, combustion processes and turbo-machinery flow fields, internal waves and river/ocean flows were considered

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“…At partial load and in particular at 0.26 Q des , previous analyses showed that a rotating instability developed in the vaneless diffuser [Dazin et al, 2008].…”

Section: Constant Angular Velocity Phenomenamentioning

confidence: 97%

“…13) [Dazin et al 2008. The spectrum at design flow rate was clearly dominated by the blade passage frequency f b (7·f imp ).…”

Section: Constant Angular Velocity Phenomenamentioning

confidence: 99%

Post-Processing Methods of PIV Instantaneous Flow Fields for Unsteady Flows in Turbomachines

Cavazzini¹,

Pavesi²,

Dupont³

et al. 2012

The Particle Image Velocimetry - Characteristics, Limits and Possible Applications

Self Cite

View full text Add to dashboard Cite

show abstract

“…The spectrum information which was acquired by two microphones allows to detect the development of rotating stall in the vaneless diffuser and also to analyze its characteristics [12,25,26], as shown in figure 2, where ψ was defined as:…”

Section: Characteristics Of Rotating Stallmentioning

confidence: 99%

“…For two dimensional analysis, it was suggested the 2D core flow instability might be responsible for rotating stall. Generally, it is admitted that the effect of [11], Dazin et al [1,12], Dodds and Vahdati [13,14], Ferrara et al [15,16], Abdelhamid et al [17][18][19], Abidogun [20], Nishida and Kobayshi [21,22], Cellai et al [23], Tsurusaki et al [24], Suzuki et al [25], Caignaert et al [26]. The main research contents of these experimental studies were focused on several aspects: i.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Theoretical Analysis of the Rotating Stall in a Vaneless Diffuser of Radial Flow Pump

Heng

Ouarzazi

2016

IOP Conf. Ser.: Earth Environ. Sci.

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This paper reports an experimental and theoretical study of rotating stall in a vaneless diffuser which is coupled with a radial impeller. The experiments were conducted at 22 flow rates for two rotating speed: 1200rpm and 1800rpm. The measurements have consisted of: i/ unsteady pressure measurements delivered by two microphones flush mounted on the vaneless diffuser, ii/ 9 steady pressure taps mounted in one radial line on the diffuser to measure the pressure recovery in the vaneless diffuser. The stability of each stall mode was also studied by a 2D linear analysis; and the theoretical prediction was compared to experimental observations. The capabilities and limits of such an approach to predict the development of rotating stall have been evaluated. A non-dimensional analysis of the pressure losses at outlet was conducted to evaluate the effect of the instability development on the performance of the diffuser. It has shown that the arising of rotating stall has a positive effect on the diffuser performance.

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“…These effects are not taken into account with the 2D inviscid approach. In the work by [12] the Navier-Stokes equations were averaged with the Reynolds decomposition resulting in the need for turbulence closure modeling. They employed a two equation isotropic turbulence model.…”

Section: Introductionmentioning

confidence: 99%

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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Rotating instability in the vaneless diffuser of a radial flow pump

Cited by 23 publications

References 13 publications

Post-Processing Methods of PIV Instantaneous Flow Fields for Unsteady Flows in Turbomachines

Post-Processing Methods of PIV Instantaneous Flow Fields for Unsteady Flows in Turbomachines

Experimental Study and Theoretical Analysis of the Rotating Stall in a Vaneless Diffuser of Radial Flow Pump

Analysis of Vaneless Diffuser Stall Instability in a Centrifugal Compressor

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