Two mathematical models centrifugal compressor stage vaneless diffuser comparison

Rekstin, A. F.; Drozdov, A. A.; Solovyeva, Olga; Galerkin, Yu. B.

doi:10.1063/1.5051896

Cited by 22 publications

(5 citation statements)

References 15 publications

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“…It has at its disposal specialized engineering programs for the calculation and design of centrifugal compressors, called the Universal Modeling Method. The authors work on the Method improving [24][25][26].…”

Section: Methodsmentioning

confidence: 99%

Design, Plant Test and CFD Calculation of a Turbocharger for a Low-Speed Engine

et al. 2020

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Various approaches and techniques are used to design centrifugal compressors. These are engineering one-dimensional and quasi-three-dimensional programs, as well as CFD Computational Fluid Dynamics (CFD) programs. The final judgment about the effectiveness of the design is given by testing the compressor or its model. A centrifugal compressor for an internal combustion engine turbocharger was designed jointly by the Research Laboratory “Gas Dynamics of Turbomachines” of Peter the Great St. Petersburg Polytechnic University (SPbPU) and RPA (Research and Production Association) “Turbotekhnika”. To check its dimensionless characteristics, the compressor was tested with two geometrically similar impellers with a diameter of 175 (TKR 175E) and 140 mm (TKR 140E). The mathematical model of the Universal Modeling Method calculates the efficiency in the design mode for all tests of both compressors with an error of 0.89%, and the efficiency for the entire characteristic with an error of 1.55%. The characteristics of the TKR 140E compressor were calculated using the ANSYS commercial CFD software. For TKR-140E, a significant discrepancy in the value of the efficiency was obtained, but a good agreement in the area of operation, which was not achieved in previous calculations. According to the calculation, the work coefficient is overestimated by 9%, which corresponds to the results of previous calculations by the authors.

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Section: Methodsmentioning

confidence: 99%

Design, Plant Test and CFD Calculation of a Turbocharger for a Low-Speed Engine

et al. 2020

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“…One of the main principles of the Universal Modeling Method is the summation of head losses calculated in individual elements of the stage. The mathematical model of vaneless diffuser was created by the author of [41] and was included in the programs of the Universal Modeling Method [3,42]. In order not to calculate the head loss in the vaneless diffuser again, the condition "free slip" was set for the vaneless diffuser's walls.…”

Section: Methodsmentioning

confidence: 99%

Optimization of Return Channels of High Flow Rate Centrifugal Compressor Stages Using CFD Methods

et al. 2020

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Calculations performed with modern CFD programs aid in optimizing flow paths of centrifugal compressors. Characteristics of stator elements of flow paths, calculated via CFD methods, are considered quite accurate. We present optimized return channels (RCh) of three model industrial compressor stages with vaneless diffusers. A parameterized model was created for optimization. The MOGA (Multi-Objective Genetic Algorithm) optimization method was applied in the Direct Optimization program of the ANSYS (Analysis System) software package. Optimization objects were return channels of the stages with high flow rate 0.15. The stages have three different loading factors 0.45, 0.60, 0.70. The optimization goal was to achieve the minimum loss coefficient at the design point. During the optimization process, we varied the following: the number of vanes, the inlet angle of the vanes, the height of the vanes at the inlet, the outer and inner radii of curvature of the U-bend. The outlet angle of the vanes was selected to minimize outlet circumferential velocity. In comparison with preliminary design, the optimized RCh are more efficient across the entire range of flow rates. The optimization reduced the loss coefficient by 20% at the design flow rate.

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“…It is only necessary to wait when CFD simulated centrifugal compressor characteristics will become reliable. Now, the authors of this paper actively used CFD to design the flow path stator part [19,20] and for qualitative impeller optimization [21,22]. The impeller in Figure 2 was tested with a vaneless diffuser.…”

Section: Of 18mentioning

confidence: 99%

“…The authors' experience shows that, in contrast to stages and compressors as a whole, CFD calculations of flow path's stator elements provide useful information suitable for analysis, optimization, and mathematical modeling [19,20].…”

Section: The Application Of Cfd Calculations In Mathematical Modelingmentioning

confidence: 99%

The Current State of the Engineering Method for the Optimal Gas-Dynamic Design and Calculation of Centrifugal Compressor

Galerkin

Rekstin

Soldatova³

et al. 2020

Energies

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In the practice of centrifugal compressor designing, different engineering techniques are widely used because flow motion differential equations cannot be integrated, and Computational fluid dynamics cannot resolve the problem as a whole. Engineering personal computers’ programs are based on experimental data and the gas dynamics theory. The universal modeling method’s (UMM) mathematical model is a set of equations that determine the pressure loss in the elements of the centrifugal compressor flow path. By the earlier versions of the UMM, dozens of process compressors were designed. Several sets of empirical coefficients for stages of different specific speeds were applied. The paper presents the current state of the universal modeling method that was recently improved. The models of the centrifugal compressor characteristic calculation are described. A new model of the loading factor characteristic, an improved version of the compressor efficiency, and being based on a CFD-calculation vaneless diffuser model are samples of the improvements. Careful identification and verification demonstrate effective characteristic simulation with a single set of empirical coefficients. Centrifugal compressor new design examples of a turbo expander unit and a turbocharger are presented. The calculated characteristics are compared with the test results. For both objects, the experiments confirmed the calculated gas-dynamic characteristics with sufficient accuracy for engineering methods.

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Two mathematical models centrifugal compressor stage vaneless diffuser comparison

Cited by 22 publications

References 15 publications

Design, Plant Test and CFD Calculation of a Turbocharger for a Low-Speed Engine

Design, Plant Test and CFD Calculation of a Turbocharger for a Low-Speed Engine

Optimization of Return Channels of High Flow Rate Centrifugal Compressor Stages Using CFD Methods

The Current State of the Engineering Method for the Optimal Gas-Dynamic Design and Calculation of Centrifugal Compressor

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