Numerical simulation of gas-dynamic characteristics of the semi-open 3D impellers of the two-element centrifugal compressors stages

Aksenov, A.A.; Danilishin, A. M.; Kozhukhov, Y. V.; Simonov, A. M.

doi:10.1063/1.5051886

Cited by 18 publications

(5 citation statements)

References 4 publications

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“…They also need to be verified by a real experiment. The obtained dependences (1) and (2) for determining the flow irregularity at the inlet to the axial-radial impeller can be applied in analytical methods for calculating the impellers when determining the inlet angle βb1 from the blades height.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…In connection with the growth of requirements [2] for modern centrifugal compressors, both in terms of required pressure and energy efficiency, the need for the production of highly efficient axial radial impellers is increasing. This article continues the designed stage investigation under various working conditions by numerical calculation methods, which was begun in [5].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The gas-dynamic design of the ICC should correspond not only to high efficiency indices, but also to have a sufficiently wide area of stable operation, with a significant margin from the left boundary side of the characteristic, i.e. margin from surging [10,11,12,13,14,15,16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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The article presents results of applying the methods of computational fluid dynamics for model low-flow rate stages of centrifugal compressors with flow rate coefficient F = 0.028. The computational domain of a model centrifugal compressor for CFD-simulation consists of the following elements: inlet chamber, impeller, vaneless diffuser, return channel, outlet chamber, shaft seal labyrinth, front and back shroud leakage. Full-scale experimental studies were conducted to model stage 028 in air at an inlet pressure of p* = 1 atm. Numerical research for stage 028 held with flow rate coefficient F=(0.019-0.046) for three variants trailing edge of the impeller. According to the results of numerical research are constructed performances of stages centrifugal compressor and conducted verification of results. Estimated discrepancy between the results of numerical researches on the model with shaft seal labyrinth and without shaft seal labyrinth.

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“…When calculating the ncr rotor of a single-shaft five-stage CC that compresses hydrogencontaining gas (rotor length L = 1.605 m, mass Mr = 237.8 kg, shaft diameter in support bearings dsb = 0.07 m, maximum shaft diameter ds.max= 0.174 m, mass of the impellers Mimp = 13.3 ... 11.6 kg), with an increase in the coefficient of rigidity of the oil layer in the reference OS from 10 8 to 10 10 N / m, the speed of the first harmonic of ncr increased almost 1.3 times, the second harmonic -in approximately 1.5 times. Reduction of the stiffness coefficient of the gas layer kg in the end LS of the shaft (from 1.6*10 6 to 2*10 5 N / m) and in the LS dummis (from 4.6*10 6 to 5*10 5 N / m) with km equal 10 8 ...10 10 N / m practically does not affect the value ncr of the rotor [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Some problem of centrifugal compressors upgrading

et al. 2018

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The results of computational investigation of the influence of a gas labyrinth seals, oil end seals with floating rings and oil journal bearings lubricating layer stiffness coefficient on centrifugal compressor rotor critical speed are presented and analysed. The main principles of a method for axial forces acting on centrifugal compressor rotor calculation are listed. The method has been developed at the compressor, vacuum and refrigeration technologies department of SPbSTU. In addition, the estimation of method applicability in engineering calculations is given.

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Numerical simulation of gas-dynamic characteristics of the semi-open 3D impellers of the two-element centrifugal compressors stages

Cited by 18 publications

References 4 publications

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

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

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

Some problem of centrifugal compressors upgrading

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