Ansys CFX numerical study of stages centrifugal compressor with low-flow rate coefficient

Yablokov, Aleksey; Yanin, Ivan; Danilishin, A. M.; Zuev, A. V.

doi:10.1051/matecconf/201824509002

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…The study was carried out on a real prototype stage centrifugal compressor, using the software package ANSYS. The calculation involved the detailed spatial computer model use with a grid of discretization [2][3][4][5][6][7][8][9][10][11] necessary for solving this problem, and real gas parameters [12] were used as working fluid, which directly leads to the increase in the results obtained accuracy. The gas composition is shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Contamination effects study in the centrifugal compressor flow stage by means of numerical simulation methods

et al. 2019

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At the moment there is no effective way to clean the flow of the turbine unit, which is justified from an economic point of view. It is important to understand how deposits affect compressor performance and the need to clean out contaminants. In the available literature, such studies are not described. The computational model of a stage domain for the study includes the following elements: inlet pipe, impeller, bladeless diffuser, swivel elbow, backward guide apparatus, outlet pipe. For calculations, the computational fluid dynamics methods in the Ansys software package were used. A numerical experiment was carried out in six mass flow rate variants, two impeller revolutions variants, and three different sediment thicknesses in the flow part variants. Based on the numerical experiment results, the calculated machine operating modes characteristics are constructed. The analysis revealed that the studied deposits cause a drop in the stage characteristics by 1.5-2%. Losses in the stage increase proportionately to the thickness of deposits in the compressor flow part.

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Section: Methodsmentioning

confidence: 99%

Contamination effects study in the centrifugal compressor flow stage by means of numerical simulation methods

et al. 2019

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“…Numerical methods must be verified and validated before being applied [5]. The largest number of works are concentrated on medium-and high-flow stages with 3D impellers, while relatively few works are concentrated on the verification and validation of numerical calculations with experimental data in stages with low-flow coefficients [6][7][8][9][10][11][12][13]. The estimation of the modeling uncertainty for low-flow stages in the available literature is presented in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…Large uncertainty in [8] is due to unaccounted gaps and seals. The full stages are presented in four works [10][11][12][13]. In [10], an increased uncertainty of more than 10% for the pressure coefficient is obtained, along with up to 3% for the rest.…”

Section: Introductionmentioning

confidence: 99%

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Verification and Validation of CFD Modeling for Low-Flow-Coefficient Centrifugal Compressor Stages

et al. 2021

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In this paper, the numerical model of a centrifugal compressor low-flow stage is verified. The gaps and labyrinth seals were simulated in the numerical model. The task was to determine the optimal settings for high-quality modeling of the low-flow stages. The intergrid interface application issues, turbulence and roughness models are considered. The obtained numerical model settings are used to validate seven model stages for the range of the optimal conditional flow coefficient with Φopt = 0.008–0.018 and the conditional Mach number Mu = 0.785–0.804. The simulation results are compared with the experimental data. The high pressure stage-7 (HPS-7) stage with Φopt = 0.010 and Mu = 0.60 at different inlet pressure of 4, 10 and 40 atm is considered separately. Acceptable validation results are obtained with the recommended numerical model settings; the modeling uncertainty for the polytropic pressure coefficient δη*pol < 4% for the efficiency coefficient δη*pol exceeds the limit of 4% only in the two most low-flow stages, U and V.

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“…Modern commercial packages for modelling the workflow using computational gas dynamics methods are currently limited due to the need to train specialized personnel and the financial costs of acquiring equipment and licenses. Moreover, a number of scientific publications [9,10,11,12,13,14,15,16,17] show the efficiency of using computational methods in the design and study of centrifugal compressors low-flow rate stages. Computational methods are also used in the calculation of such an important phenomenon as surging in centrifugal compressors [18,19].…”

Section: Introductionmentioning

confidence: 99%

Head Math Model For The Low-Flow Impellers Of The Centrifugal Compressors

Ivanov

Kozhukhov

Nguyen³

2019

E3S Web Conf.

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A new mathematical model has been developed to determine the coefficient of internal and theoretical head in the variant design of the low-flow rate centrifugal compressors impellers. A parametric study of the flow part of the impeller is carried out. In total 1620 impellers are numericaly simulated. As a result, a numerical database of gas dynamic and geometric parameters was developed. Due to an a priori analysis, the relations of parameters with the geometric shape of the flow part are determined. The mathematical model is developed using gas-dynamic parameters and relations determined from numerical database. Using centrifugal compressor stage digital twins, a generalizing relationship has been developed to determine the complex of friction and leakage losses.The reliability of the math model is validated by the comparison with experimental data and the results of numerical experiment in digital twins, which are not involved in the model. The application of the head math model is determined in the range of the conditional flow coefficient 0.006<Φd<0.02 and the theoretical head coefficient 0.60 <ψt<0.72.

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Ansys CFX numerical study of stages centrifugal compressor with low-flow rate coefficient

Cited by 9 publications

References 8 publications

Contamination effects study in the centrifugal compressor flow stage by means of numerical simulation methods

Contamination effects study in the centrifugal compressor flow stage by means of numerical simulation methods

Verification and Validation of CFD Modeling for Low-Flow-Coefficient Centrifugal Compressor Stages

Head Math Model For The Low-Flow Impellers Of The Centrifugal Compressors

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