Computational Fluid Dynamics Application for Analysis of Centrifugal Compressor Stage Stator Part

Marenina, L. N.; Galerkin, Yu. B.; Soldatova, K. V.

doi:10.18178/ijmerr.7.6.656-661

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…For the correct formulation of the optimization problem, it is necessary to create a parametrized model of the flow path and determine the dimensions of the computational grid common to all calculations, select the appropriate turbulence model, and set the boundary conditions. The methodology for setting up CFD calculations was studied by the authors in [15,16]. At all stages of model creation and calculations, the Workbench environment of the ANSYS CFX 19 software package was used.…”

Section: Cfd Calculation Methodologymentioning

confidence: 99%

Stator elements optimization of centrifugal compressor intermediate type stage by CFD methods

2020

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Optimal gas-dynamic design is a complex and time-consuming process. Modern CFD methods help in solving optimization problems and reliably calculating characteristics of stator elements of centrifugal compressor stages. To carry out such calculations, it is necessary to create a parametrized model, which facilitates automation of the process of changing the flow path geometry, rebuilding its dimensions and the computational grid. Using the Direct Optimization program of the ANSYS software package, we have optimized the flow path of the stator elements of a centrifugal compressor intermediate type stage consisting of a vaneless diffuser and a return channel. In this paper, the MOGA (Multi-Objective Genetic Algorithm) optimization method was used. The object of the study was stator elements of one of the model stages designed by the Problem Laboratory of Compressor Engineering, SPbPU. The goal was to achieve the minimum value of the loss coefficient of stator elements when changing 5 geometric parameters: the number of vanes, the inlet vane angle, the height of the vane at the inlet to the return channel vane cascade, the radius of curvature of the leading edge and the thickness of the vane profile. For the best variants based on the results of optimization, the characteristics of the loss coefficient depending on the flow rate coefficient were calculated, their characteristics were compared with the initial variant of the stator elements. The best variant in the design mode has a loss coefficient 4.4% lower than the reference model. With a flow rate coefficient of 1.63 times greater than the calculated one, the optimized variant’s loss coefficient is 33% less.

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Section: Cfd Calculation Methodologymentioning

confidence: 99%

Stator elements optimization of centrifugal compressor intermediate type stage by CFD methods

2020

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“…The calculation was made according to the method of preliminary design [7,38]. The authors have studied this problem in [39,40]. The object of the research there was a return channel as well.…”

Section: Methodsmentioning

confidence: 99%

“…The authors have studied this problem in [39,40]. The object of the research there was a return channel as well.…”

Section: Methodsmentioning

confidence: 99%

Optimization of Return Channels of High Flow Rate Centrifugal Compressor Stages Using CFD Methods

et al. 2020

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Calculations performed with modern CFD programs aid in optimizing flow paths of centrifugal compressors. Characteristics of stator elements of flow paths, calculated via CFD methods, are considered quite accurate. We present optimized return channels (RCh) of three model industrial compressor stages with vaneless diffusers. A parameterized model was created for optimization. The MOGA (Multi-Objective Genetic Algorithm) optimization method was applied in the Direct Optimization program of the ANSYS (Analysis System) software package. Optimization objects were return channels of the stages with high flow rate 0.15. The stages have three different loading factors 0.45, 0.60, 0.70. The optimization goal was to achieve the minimum loss coefficient at the design point. During the optimization process, we varied the following: the number of vanes, the inlet angle of the vanes, the height of the vanes at the inlet, the outer and inner radii of curvature of the U-bend. The outlet angle of the vanes was selected to minimize outlet circumferential velocity. In comparison with preliminary design, the optimized RCh are more efficient across the entire range of flow rates. The optimization reduced the loss coefficient by 20% at the design flow rate.

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“…In our opinion, solving the problem of overstating the loading factor will also lead to the matching of the ranges of the calculated and measured efficiency characteristics. The experience of the R&D Laboratory "Gas Dynamics of Turbomachines" in the application of CFD calculations to the modeling of stator elements of centrifugal stages shows good results [14][15]. CFD calculations have been applied in the implementation of gas-dynamic projects of centrifugal compressors and replaceable flow paths in the interests of industrial partners.…”

Section: Introductionmentioning

confidence: 99%

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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Computational Fluid Dynamics Application for Analysis of Centrifugal Compressor Stage Stator Part

Cited by 10 publications

References 2 publications

Stator elements optimization of centrifugal compressor intermediate type stage by CFD methods

Stator elements optimization of centrifugal compressor intermediate type stage by CFD methods

Optimization of Return Channels of High Flow Rate Centrifugal Compressor Stages Using CFD Methods

Mathematical model of centrifugal compressor vaneless diffuser based on CFD calculations

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