MODELLING OF REFRIGERATION CENTRIFUGAL COMPRESSOR STATIC MODES OPERATION

The aim of the scientific work is to improve the accuracy of static modes simulation of the cen-trifugal compressors operation. To achieve this scientific aim the models designing the centrifu-gal compressors characteristics have been carried out. These characteristics must be obtained at various speeds of rotation and the angles of the vanes of the diffuser. The model of the refrigera-tion centrifugal compressor presented in this article is realized in MATLABSimulink program. The modern achievements review in the field of centrifugal compressors modeling is presented. The necessity of the centrifugal compressor modeling has been substantiated. The tabular data describing static characteristics of the compressors is shown. These tabular data are determined in the Lookup Table blocks. The model is represented by these blocks in the MATLABSimulink program. The alternative compressor model has been also presented. This realized model is based on the interpolation spline functions. This alternative model is presented in the DC-Net program. DC-Net program is destined for modeling and research of the logical-dynamic systems. The cen-trifugal compressors model is presented in the DC-Net program as the logical-dynamic systems. The compressor static characteristic set received as a modeling result is shown. Twelve charac-teristics in axes are presented. The pressure ratio and the refrigerant flow are denoted on the ax-es. These static characteristics can be compared with experimental characteristics to assess the model adequacy. The assessment of the model adequacy is realized on the basis of the simulation results comparison. Simulation results comparison obtained in the various models is presented. The conclusions about the optimal methods of the model synthesis are given.