Issues of gas dynamic characteristics modeling: a study on a centrifugal compressor model stage

Borovkov, A. I.; Voinov, I. B.; Galerkin, Yu. B.; Nikiforov, A. G.; Никитин, М. А.; Solovyeva, Olga; Kabalyk, Kirill

doi:10.1051/e3sconf/201914006003

Cited by 13 publications

(2 citation statements)

References 12 publications

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“…The authors' experience confirms the presence of such problems [10][11][12][13]. 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.…”

Section: Introductionsupporting

confidence: 61%

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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Section: Introductionsupporting

confidence: 61%

Mathematical model of centrifugal compressor vaneless diffuser based on CFD calculations

Solovyeva

Drozdov

2020

E3S Web Conf.

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“…Despite considerable efforts, CFD calculations of the characteristics of centrifugal stages still do not provide reliable results [24,25]. The results of modeling stage 0028-058-0373 characteristics were not entirely satisfactory either [26].…”

Section: Verification Of Optimization Results By Cfd Calculation Of Whole Stagementioning

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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Methodology of calculation and verification of vaneless diffusers test results in a virtual wind tunnel

Galerkin

Solovyeva

Ucehovscy

2020

International Conference on Science and Applied Science (Icsas2020)

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Issues of gas dynamic characteristics modeling: a study on a centrifugal compressor model stage

Cited by 13 publications

References 12 publications

Mathematical model of centrifugal compressor vaneless diffuser based on CFD calculations

Mathematical model of centrifugal compressor vaneless diffuser based on CFD calculations

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

Methodology of calculation and verification of vaneless diffusers test results in a virtual wind tunnel

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