Use of 3D Methods for Flow Analysis, Prediction of Characteristics, and Optimization of the Shape of Settings of Hydraulic Turbines

Жарковский, А. А.; Pospelov, A. Yu.

doi:10.1007/s10749-015-0568-4

Cited by 11 publications

(6 citation statements)

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“…The value of the near-wall function y+ is less than 3. The calculated block-structured grids were designed according to the recommendations of the authors of the works [6][7][8][9][10][11][12][13][14][15][16][17][18]. The results of the work were obtained using computational resources of Peter the Great Saint-Petersburg Polytechnic University Supercomputing Center (www.spbstu.ru).…”

Section: Methodsmentioning

confidence: 99%

Numerical characteristics of a centrifugal compressor with a low flow coefficient

et al. 2019

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The study presents the simulation results of the viscid gas flow in low flow coefficient centrifugal compressor stages. The problem is solved in a stationary formulation using the Ansys CFX software package. The numerical simulation is carried out on three ultrahigh-pressure model stages; two stages have blades of the classical type impeller and one stage is of the bodily type. The value of the conditional flow coefficient is 0.0063 to 0.015. As part of the study, block-structured design meshes are used for all gas channel elements, with their total number being equaled as 13–15 million. During the calculations a numerical characteristic was validated with the results of tests carried out at the Department of Compressor, Vacuum and Refrigeration Engineering of Peter the Great St. Petersburg Polytechnic University. With an increase of inlet pressure as a result of a numerical study, it was found that for a given mathematical model the disk friction and leakage coefficient (1 + βfr + βlk) is overestimated. The analysis of flow in labyrinth seals has shown an increase of total temperature near the discs by 30–50 °С, nevertheless this fact did not influence gas parameters in the behind-the-rotor section. The calculation data obtained with finer design mesh (the first near-wall cell was 0.001 mm) is identical to those obtained with the first near-wall cell 0.01 mm mesh.

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Section: Methodsmentioning

confidence: 99%

Numerical characteristics of a centrifugal compressor with a low flow coefficient

et al. 2019

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“…As the main research method, a numerical experiment was used. To solve these problems, CFD modelling (Ansys software package) was used using recommendations for constructing, calculating and modeling centrifugal compressors [2,6,7,8,9,10,11,21,22,23,24]. Programs for calculating the quasithree-dimensional inviscid flow in the impellers blade lattices and the developed mathematical model for the design and calculation of centrifugal compressors and compressor stages were used [12,13,14].…”

Section: Methodsmentioning

confidence: 99%

The investigation of absolute flow non-uniform velocity distributions influence at the centrifugal compressor axial radial impeller inlet using numerical calculation methods in ANSYS CFX

et al. 2019

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Currently, methods of numerical modelling are widely used. They are especially widely used in the design of turbo compressors. For the specific task of designing new flowing parts of a centrifugal compressor, it is not recommended to deviate from the canonical design techniques, but it is preferable to supplement them with numerical methods. This article is devoted to the end two-element stage investigation of a centrifugal compressor with an axial radial impeller; the stage main dimensions were obtained using the method of V.F. Rice. In order to obtain the necessary pressure characteristics and determine the dependence for the absolute velocity non-uniform distribution at the inlet to the axial radial impeller, the flow path main dimensions were optimized using numerical calculation methods. The calculation was performed using the SST turbulence model using computational gas dynamics methods in the ANSYS CFX software environment. Based on the optimization results, five compressor designs and corresponding characteristics were obtained. The absolute velocity distribution nature at the inlet to the centrifugal compressor axial radial impeller for five flow path variants is investigated. Empirical dependences are obtained for the deviation of the absolute velocity at the inlet in the hub section axial radial impeller and the absolute velocity deviation at the shroud from the absolute velocity at the average diameter based on the results of a numerical experiment. Recommendations are made for further absolute velocity distributions investigating at the inlet to the compressor impeller.

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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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Use of 3D Methods for Flow Analysis, Prediction of Characteristics, and Optimization of the Shape of Settings of Hydraulic Turbines

Cited by 11 publications

References 0 publications

Numerical characteristics of a centrifugal compressor with a low flow coefficient

Numerical characteristics of a centrifugal compressor with a low flow coefficient

The investigation of absolute flow non-uniform velocity distributions influence at the centrifugal compressor axial radial impeller inlet using numerical calculation methods in ANSYS CFX

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

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