Abstract. The article deals with a description of results from research and development of a radial compressor stage. The experimental compressor and used numerical models are briefly described. In the first part, the comparisons of characteristics obtained experimentally and by numerical simulations for stage with vaneless diffuser are described. In the second part, the results for stage with vanned diffuser are presented. The results are relevant for next studies in research and development process.

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The design of a new family of process compressor stages is described. The paper discusses the choice of master and derived stages to cover the required flow range and provides guidelines for the design of the stage components, including the impeller, diffuser and the return channel. Details are given of the mechanical and aerodynamic design process and the computational tools used for this. The test results show that the performance objectives have been achieved. Results from testing of some of the stages are compared with CFD simulations. These show that the inclusion of real geometry features, such as the shroud and hub leakage paths and the end-wall fillets, is necessary to obtain good agreement with the measured performance. INTRODUCTIONMultistage industrial process compressors are designed to cover a wide range of volume flows, pressure ratios and gas properties for many different applications. In-line compressors are tailormade from standard designs to meet the individual customer's requirements, and to customize them to the specification, changes are introduced in the impeller diameters, number of stages, stage types,

Abstract. Article describes numerical simulations of air flow in radial compressor stage in NUMECA CFD software. In simulations geometry variants with and without seals are used. During tasks evaluating was observed seals influence on flow field and performance parameters of compressor stage. Also is described CFD results comparison with results from design software based on experimental measurements and monitoring of influence of seals construction on compressor stage efficiency.