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CFD researches of centrifugal compressor stage vane diffusers in interests of math modeling

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Abstract

The paper presents results of CFD parametric study of centrifugal compressor stage vane diffusers in the Ansys CFX. The results obtained will be used to build a mathematical model of vane diffuser in optimization design system. Objects of research are vane diffusers with external relative diameter (relative to the diameter of the impeller) equal to 1.5; vane inlet angle of 20°; relative vane heights of 0.025, 0.034, 0.045, 0.06, and 0.08; and vane profile curvature angles of 10, 15, and 20 °. The characteristics of polytrophic efficiency, loss coefficient, recovery coefficient, ratio of inlet and outlet velocities, and flow deviation angle versus incidence angle are set. The analysis of the flow structure in the vane diffuser channels is presented. Unlike with a straight vane cascade, the deviation angle in the circular rows of vane diffusers tends to increase with increasing row density. This may be due to the complex nature of the interaction of the active part of the flow with separation zones. In rows with almost straight vanes at a lower density, the separation zone on the pressure side decreases and even shifts to the very end of the suction side.

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Abbreviations

b :

Blade height, channel width in the direction of rotor axis

с :

Absolute flow velocity

c p :

Specific heat capacity at constant pressure

c u :

Tangential component of absolute velocity

D :

Diameter

h p :

Polytrophic pressure

h d :

Dynamic pressure

h l :

Lost pressure in stage flow path

i :

Incidence angle

k :

Isentropic coefficient

l :

Blade length

\( \overline{m} \) :

Mass flow rate

M :

Mach number, force moment

p :

Pressure

r :

Radius

R :

Gas constant, curvature radius

Re :

Reynolds number

t :

Distance between the vanes

T :

Temperature

z :

Number of vanes

α :

Angle between absolute velocity and circumferential direction

α v :

Angle between blade midline tangent and circumferential direction

δ v :

Blade thickness

ζ :

Loss coefficient

η :

Polytrophic efficiency

θ :

Profile curvature angle, degree

ν :

Kinematic viscosity

ξ :

Recovery coefficient

ρ :

Gas density

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Acknowledgements

The calculations were performed using the supercomputer of the center “Polytechnic” SPbPU.

Funding

The research is partially funded by the Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program (Contract No. 075-15-2020-934 dated 17.11.2020)

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Authors and Affiliations

  1. Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia

    Aleksey Borovkov, Yuri Galerkin, Evgeniy Petukhov, Aleksandr Drozdov, Vladimir Yadikin, Aleksey Rekstin, Vasiliy Semenovskiy, Olga Solovyeva & Lyubov Marenina

Authors
  1. Aleksey Borovkov
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  2. Yuri Galerkin
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  3. Evgeniy Petukhov
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  4. Aleksandr Drozdov
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  5. Vladimir Yadikin
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  6. Aleksey Rekstin
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  7. Vasiliy Semenovskiy
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  8. Olga Solovyeva
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  9. Lyubov Marenina
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Contributions

Conceptualization, A. Borovkov and V. Yadikin; methodology, Y. Galerkin and E. Petukhov; software, A. Drozdov; validation, V. Semenovskiy and O. Solovyeva; writing—review and editing, A. Rekstin and L. Marenina.

Corresponding author

Correspondence to Lyubov Marenina.

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Borovkov, A., Galerkin, Y., Petukhov, E. et al. CFD researches of centrifugal compressor stage vane diffusers in interests of math modeling. Int J Adv Manuf Technol 118, 129–141 (2022). https://doi.org/10.1007/s00170-021-07335-5

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