Numerical study of centrifugal compressor stage vaneless diffusers

9th International Conference on Compressors and their Systems

Galerkin, Y.^1 ; Soldatova, K.^1 ; Solovieva, O.^1

R and D Laboratory Gas Dynamics of Turbo Machines, Peter the Great St.Petersburg Polytechnic University, Polytechnical st. 29, St.Petersburg, Russia^1

关键词: Algebraic equations;    Algebraic modeling;    Centrifugal compressor stage;    Friction coefficients;    Method of modeling;    Practical calculation;    Simulation accuracy;    Vaneless diffuser;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/90/1/012048/pdf
DOI  :  10.1088/1757-899X/90/1/012048

来源: IOP

【 摘 要 】

The authors analyzed CFD calculations of flow in vaneless diffusers with relative width in range from 0.014 to 0.100 at inlet flow angles in range from 100to 450with different inlet velocity coefficients, Reynolds numbers and surface roughness. The aim is to simulate calculated performances by simple algebraic equations. The friction coefficient that represents head losses as friction losses is proposed for simulation. The friction coefficient and loss coefficient are directly connected by simple equation. The advantage is that friction coefficient changes comparatively little in range of studied parameters. Simple equations for this coefficient are proposed by the authors. The simulation accuracy is sufficient for practical calculations. To create the complete algebraic model of the vaneless diffuser the authors plan to widen this method of modeling to diffusers with different relative length and for wider range of Reynolds numbers.