Numerical study of centrifugal compressor stage vaneless diffusers

Galerkin, Yu. B.; Soldatova, K. V.; Solovieva, O.A.

doi:10.1088/1757-899x/90/1/012048

Cited by 13 publications

(2 citation statements)

References 2 publications

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“…Flow that leaves an impeller is non-uniform. A bend of return channel creates acceleration-deceleration zones in a diffuser (see Galerkin et al, 2015). It may result in an early flow separation.…”

Section: The Optimization Of the Vaneless Diffusermentioning

confidence: 99%

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Vaneless diffuser for low flow rate centrifugal compressor stage

Solovyeva

Galerkin

Drozdov

2019

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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Experiments and CFD-analysis of vaneless diffusers demonstrate that in wide range of relative width there is a risk of flow separation at design flow rate as a flow angle after an impeller is too small. To avoid it the inlet part of a diffuser is made with decreasing width along radius.By the elementwise calculation the diffuser with relative width about 2%, narrowed initial part and conical surfaces with the divergence angle 3 0 between them is turned out to be the best variant of the considered.The diffuser within the stage with narrowed initial part and zero divergence angle has the highest efficiency when relative flow rates are less than design regime flow rate. The stage with diffuser with walls divergence angle 0 0 45' after narrowed part is less effective on 0.5% when relative flow rates are less than design regime. The maximum efficiency of this stage is 1.5% higher and efficiency is sufficiently higher at big flow rates.

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Section: The Optimization Of the Vaneless Diffusermentioning

confidence: 99%

“…The paper Galerkin et al (2015) presents the results of the computational analysis of the vaneless diffuser with 3 2 / b D =0.014 and conical surfaces with divergence angle υ = 0 0 28' -6 0 between walls. Calculations have shown that in narrow diffuser with a small walls divergence angle shear stresses are high.…”

Section: Introductionmentioning

confidence: 99%

Vaneless diffuser for low flow rate centrifugal compressor stage

Solovyeva

Galerkin

Drozdov

2019

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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Performance Study of a Twisted Vaned Diffuser in a Compressor Stage

Pothuri¹,

Govindaraju²,

Baraar³

et al. 2019

Lecture Notes on Multidisciplinary Industrial Engineering

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Mathematical model of centrifugal compressor vaneless diffuser based on CFD calculations

Solovyeva

Drozdov

2020

E3S Web Conf.

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The approximate engineering techniques based on mathematical modelling are used in centrifugal compressor design. One of such methods is the well-proven Universal Modelling Method, developed in the scientific and research laboratory “Gas dynamics of turbo machines”, SPbPU. In the modern version of the compressor model, vaneless diffusers mathematical model was applied based on a generalization of the CFD calculations. The mathematical model can be used for vaneless diffusers with a relative width in the range of 1.4 – 10.0%, with a radial length up to 2.0, in the range of inlet flow angles 10 to 90 degrees, the inlet velocity coefficient in the range of 0.39 – 0.82, Reynolds number varying from 87 500 to 1 030 000. The model was also used for calculating low-flow-rate model stages with narrow diffusers with diffusers’ relative width in the range of 0.5 – 2.0%. The mathematical model showed lesser accuracy. To widen the model applicability, new series of CFD-calculations were executed. A series of vaneless diffusers was designed with relative width in the range of 0.6 – 1.2%, The gas-dynamic characteristics of loss coefficients and outlet flow angle versus inlet flow angle of diffuser were calculated. Regression analysis was used to process the calculated data. System of algebraic equations linking geometric, gas-dynamic parameters and similarity criteria was developed. The obtained equations are included in a new mathematical model of the Universal Modelling Method.

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Numerical study of centrifugal compressor stage vaneless diffusers

Cited by 13 publications

References 2 publications

Vaneless diffuser for low flow rate centrifugal compressor stage

Vaneless diffuser for low flow rate centrifugal compressor stage

Performance Study of a Twisted Vaned Diffuser in a Compressor Stage

Mathematical model of centrifugal compressor vaneless diffuser based on CFD calculations

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