An alternative method for centrifugal compressor loading factor modelling

10th International Conference on Compressors and their Systems

Galerkin, Y.^1 ; Drozdov, A.^1 ; Rekstin, A.^1 ; Soldatova, K.^1

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

关键词: Calculation error;    Compressor stage;    Empirical coefficients;    Empirical formulas;    Flow coefficients;    Geometry parameter;    Modelling method;    Performance modelling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/232/1/012039/pdf
DOI  :  10.1088/1757-899X/232/1/012039

来源: IOP

【 摘 要 】

The loading factor at design point is calculated by one or other empirical formula in classical design methods. Performance modelling as a whole is out of consideration. Test data of compressor stages demonstrates that loading factor versus flow coefficient at the impeller exit has a linear character independent of compressibility. Known Universal Modelling Method exploits this fact. Two points define the function - loading factor at design point and at zero flow rate. The proper formulae include empirical coefficients. A good modelling result is possible if the choice of coefficients is based on experience and close analogs. Earlier Y. Galerkin and K. Soldatova had proposed to define loading factor performance by the angle of its inclination to the ordinate axis and by the loading factor at zero flow rate. Simple and definite equations with four geometry parameters were proposed for loading factor performance calculated for inviscid flow. The authors of this publication have studied the test performance of thirteen stages of different types. The equations are proposed with universal empirical coefficients. The calculation error lies in the range of plus to minus 1,5%. The alternative model of a loading factor performance modelling is included in new versions of the Universal Modelling Method.