Numerical Investigation of Different Radial Inlet Forms for Centrifugal Compressor and Influence of the Deflectors Number by Means of Computational Fluid Dynamics Methods with Computational Model Validation

Kozhukhov, Y. V.; Yun, V. K.; Reshetnikova, L V; Prokopovich, M V

doi:10.1088/1757-899x/90/1/012047

Cited by 19 publications

(6 citation statements)

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“…VIGV is designed to create swirling air supplied to the rotor blades of the first stage of the compressor in order to reduce the relative velocities and obtain optimal angles of flow on the rotor blade profile. There are examples of successful application of CFD methods to the input and output devices of a centrifugal compressor [17,18].…”

Section: Resultsmentioning

confidence: 99%

Application of Super-Computer Technologies in the Research and Improvement of Steps and Elements of the Flow Path of the Turbocompressors

et al. 2020

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This paper presents the results of the study of the spatial flow in the turbocompressors elements of computational fluid dynamics methods using the Ansys CFX software package on a multiprocessor computer system. Five objects of research are considered: 1) flow path of an intermediate stage of an average-flow centrifugal compressor; 2) flow path of the low-flow centrifugal compressor stage; 3) a natural gas centrifugal compressor stage; 4) vaned diffuser of the first stage of an industrial multistage centrifugal compressor; 5) adjustable inlet stator of the first stage of an industrial turbocompressors. Generally at manufacturing new centrifugal compressors, it is impossible to make a control measurement of the parameters of the working process inside the flow path elements. Computational fluid dynamics methods are widely used to overcome this difficulties. However verification and validation of CFD methods are necessary for accurate modeling of the workflow. All calculations were performed on one of the SPbPU clusters. Parameters of one cluster: AMD Opteron 280 4 cores. The calculations were carried out with parallel running of the processors: HP MPI Distributed Parallel and HP MPI Local Parallel for different objects.

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Section: Resultsmentioning

confidence: 99%

Application of Super-Computer Technologies in the Research and Improvement of Steps and Elements of the Flow Path of the Turbocompressors

et al. 2020

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“…Further development of the centrifugal compressors [1][2][3][4][5][6][7][8][9][10][11][12] design is associated with increases in rotor rotational velocities, and as a result of loads on structural elements and plant capacities, while maintaining a sufficient level of operational safety both from the strength of the nodes and the stability of the performance. One of the causes of accidents on the compressor is getting into the surge due to an inoperative surge protection system, or not being able to take into account all the factors affecting the compressor in the surge state.…”

Section: Introductionmentioning

confidence: 99%

Improving the reliability of the compressor unit using the wavelet transform method

et al. 2019

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Centrifugal compressors are an integral part of modern production in such industries as gas transmission, oil refining, metallurgical, machine-building, mining, as well as in electric and heat power engineering. Interruptions in the operation or failures of compressors lead to decrease in profit or large material loss. Conditions should be created for the safe (stable) operation of centrifugal compressors. Surge is global (complete) loss of stability, an unacceptable phenomenon for a centrifugal compressor. Compressor surge protection must function during operation. The algorithms used to protect centrifugal compressors against surge have some drawbacks, which makes it impossible to reliably prevent surges. There are many methods for analyzing rapidly changing processes in the flow part of a centrifugal compressor. The wavelet theory is the most accurate and modern method. The use of the wavelet transform method for signal processing allows us to solve the problems of analyzing non-stationary processes of a centrifugal compressor to expand the acceptable range of work and build reliable operation of the anti-surge diagnostic system. In the future, it is possible to use other basic wavelet functions, for comparison and selection of the most suitable one, for the analysis of unsteady signals in a centrifugal compressor.

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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 Investigation of Different Radial Inlet Forms for Centrifugal Compressor and Influence of the Deflectors Number by Means of Computational Fluid Dynamics Methods with Computational Model Validation

Cited by 19 publications

References 0 publications

Application of Super-Computer Technologies in the Research and Improvement of Steps and Elements of the Flow Path of the Turbocompressors

Application of Super-Computer Technologies in the Research and Improvement of Steps and Elements of the Flow Path of the Turbocompressors

Improving the reliability of the compressor unit using the wavelet transform method

Some problem of centrifugal compressors upgrading

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