scholarly journals Verification of numerical simulation results for low-flow centrifugal compressor stage with experimental data by Numeca Fine/Turbo and Ansys CFX software packages

2021 ◽  
Author(s):  
R.A. Shtanichev ◽  
◽  
A.M. Yablokov ◽  
N.I. Sadovsky ◽  
◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Centrifugal Compressor ◽  
Low Flow ◽  
Compressor Stage ◽  
Centrifugal Compressor Stage ◽  
Software Packages ◽  
Ansys Cfx ◽  
Simulation Results

Investigation of a Centrifugal Compressor Stage With Two Volutes and the Same Impeller

2003 ◽  
Author(s):  
Yinghui Dai ◽  
Abraham Engeda ◽  
Michael Cave ◽  
Jean-Luc Di Liberti
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Centrifugal Compressor ◽  
Internal Flow ◽  
Sudden Expansion ◽  
Compressor Stage ◽  
Centrifugal Compressor Stage ◽  
Compressor Impeller ◽  
Overall Performance ◽  
Good Agreement

Volute scroll, conic diffuser and sudden expansion discharge loss account for 4–6 points of efficiency decrement in a typical centrifugal compressor stage. The flow in a volute is highly complex. It is strongly believed that understanding of the detailed flow structure in a volute will provide insights on minimizing the losses by isolating the mechanisms that contributes to entropy generation. The result will be a more efficient centrifugal compressor product for customers and users and a product at higher profitability levels for manufacturers. This paper presents the experimental and numerical investigation on the matching of two different overhung volutes to the same centrifugal compressor impeller. The experimental data were measured from flange to flange firstly, then three Kiel probes were installed on pinch position circumferentially. At the same time, a detailed numerical simulation of the performance of the two volutes has been carried out. A computational model, using the k-ε turbulence model and the wall function, has been used to predict the internal flow of the both volutes. A good agreement between experimental data and numerical simulation results is found. The overall performance of the two volutes was also discussed in detail.

scholarly journals Numerical Modeling of the Flow in a Vaneless Diffuser of Centrifugal Compressor Stage

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Mykola Kalinkevych ◽  
Oleg Shcherbakov
Keyword(s):  
Experimental Data ◽  
Numerical Modeling ◽  
Centrifugal Compressor ◽  
Compressor Stage ◽  
Vaneless Diffuser ◽  
Flow Core ◽  
Flow Area ◽  
Centrifugal Compressor Stage ◽  
Ansys Cfx ◽  
Sst Turbulence Model

This paper presents the results of numerical investigation of the flow in a vaneless diffuser of centrifugal compressor stage. Simulations were performed using both a commercial CFD package ANSYS CFX and the own-designed computer program. Steady conditions involving SST turbulence model were used for the calculations using CFX. To consider the interaction between impeller and diffuser, not just a diffuser but the whole stage was calculated. The own-designed methodology is based on solving of conservation equations with assumptions that flow in a diffuser is steady state and axisymmetric. The flow area is divided into the flow core and boundary layers. Results of calculation were compared with experimental data.

Numerical Investigation of the Unsteady Flow Inside a Centrifugal Compressor Stage With Pipe Diffuser

2013 ◽  
Vol 136 (3) ◽  
Author(s):  
Daniel R. Grates ◽  
Peter Jeschke ◽  
Reinhard Niehuis
Keyword(s):  
Experimental Data ◽  
Unsteady Flow ◽  
Centrifugal Compressor ◽  
Measurement Techniques ◽  
Navier Stokes ◽  
Compressor Stage ◽  
Centrifugal Compressor Stage ◽  
Transonic Centrifugal Compressor ◽  
Computational Fluid Dynamics Cfd ◽  
The Subject

The subject of this paper is the investigation of unsteady flow inside a transonic centrifugal compressor stage with a pipe-diffuser by utilizing unsteady 3D Reynolds-averaged Navier–Stokes simulations (unsteady 3D URANS). The computational fluid dynamics (CFD) results obtained are compared with detailed experimental data gathered using various steady and unsteady measurement techniques. The basic phenomena and mechanisms of the complex and highly unsteady flow inside the compressor with a pipe-diffuser are presented and analyzed in detail.

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

2020 ◽  
Vol 220 ◽  
pp. 01078
Author(s):  
Yuri Kozhukhov ◽  
Aleksey Danilishin ◽  
Sergey Kartashov ◽  
Lyubov Gileva ◽  
Aleksey Yablokov ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Centrifugal Compressor ◽  
Flow Path ◽  
Low Flow ◽  
Compressor Stage ◽  
Vaned Diffuser ◽  
Control Measurement ◽  
Multiprocessor Computer ◽  
Centrifugal Compressor Stage

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.

Numerical Investigation of the Unsteady Flow Inside a Centrifugal Compressor Stage With Pipe Diffuser

2013 ◽  
Author(s):  
Daniel R. Grates ◽  
Peter Jeschke ◽  
Reinhard Niehuis
Keyword(s):  
Experimental Data ◽  
Unsteady Flow ◽  
Numerical Investigation ◽  
Centrifugal Compressor ◽  
Measurement Techniques ◽  
Navier Stokes ◽  
Compressor Stage ◽  
Centrifugal Compressor Stage ◽  
Transonic Centrifugal Compressor ◽  
The Subject

The subject of this paper is the investigation of unsteady flow inside a transonic centrifugal compressor stage with pipe-diffuser by utilizing unsteady 3D Navier-Stokes simulations (unsteady 3D URANS). The CFD results obtained are compared with detailed experimental data gathered using various steady and unsteady measurement techniques. The basic phenomena and mechanisms of the complex and highly unsteady flow inside the compressor with pipe-diffuser are presented and analyzed in detail.

Investigating the Effect of the Axial Clearance Magnitude Between the Covering Disc of the Runner and the Centrifugal Compressor Body on the Gas Dynamics in a Low-Discharge Stage Prototype

2020 ◽  
pp. 106-120
Author(s):  
A.M. Yablokov ◽  
R.A. Shtanichev ◽  
N.I. Sadovskiy ◽  
Yu.V. Kozhukhov
Keyword(s):  
Experimental Data ◽  
Centrifugal Compressor ◽  
Gas Dynamics ◽  
Software Package ◽  
Gas Flow ◽  
Compressor Stage ◽  
Peter The Great ◽  
Mesh Independence ◽  
Ansys Cfx ◽  
Axial Clearance

The paper presents the results of numerically investigating viscous gas flow in a simulated low-discharge stage of a super high-pressure type compressor, using the ANSYS CFX software package. We studied the low-discharge centrifugal compressor stage prototype designed and tested at the Compressor, Vacuum and Refrigerating Technology Department of Peter the Great St. Petersburg Polytechnic University. In order to conduct the numerical experiment, we performed a mesh independence study. We compared the properties obtained in the numerical investigation to the experimental data. In our mathematical simulation the magnitude of the axial clearance between the covering disc of the runner and the compressor body varies in the range of 1--5.5 mm; we estimate the effect that varying this number has on the loss complex characteristic 1 + βfriction + βleakage

Analysis and Redesign of the Stationary Components for a Low Flow Coefficient Centrifugal Compressor Stage

2009 ◽  
Author(s):  
Zhiheng Wang ◽  
Guang Xi
Keyword(s):  
Centrifugal Compressor ◽  
Design Flow ◽  
Flow Coefficient ◽  
Low Flow ◽  
Meridional Plane ◽  
Compressor Stage ◽  
Centrifugal Compressor Stage ◽  
Lower Stage ◽  
Wide Range ◽  
Low Flow Coefficient

A low flow coefficient centrifugal compressor stage is characterized by the small relative outlet width, and is often one of the latter stages in the multistage compressor. The low flow coefficient stage is known to give lower stage efficiency in comparison with the conventional stage, which still leaves much more space to be improved with modern tools such as CFD techniques. In the paper the flow in a CO2 centrifugal compressor stage with a low design flow coefficient of 0.008 is simulated based on the 3D viscous CFD codes. The analysis shows the impeller gives a favorable performance over a wide range of low flow coefficient, but the high losses exist in the stationary components and this incurs the poor performance of the whole stage. In this case, the diffuser, the return channel and the meridional plane are redesigned. The redesigned stage has distinct improvements on the performance and the flow structure.

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