EFFICIENCY INCREASE OF SMALL-FLOW-RATE OF HIGH- AND SUPERHIGH CENTRIFUGAL COMPRESSORS ON STUDY BASIS OF INFLUENCE OF REYNOLDS NUMBER AND OF ROUGHNESS ON OPERATING PROCESSES

There the study objects are the small-flow-rate intermediate stages of centrifugal compressor. The paper purposes are to study the influence of Reynolds number, of roughness and of dimensions on the stage efficiency; to develop the design procedures of polytropic compression process, of dion losses and of leakages; to develop the recommendations for the designing. The experimental studies of stage of centrifugal compressor in the absolute motion have been taken place. The design procedure of disc losses and of loses on the basis of solution of motion equations for the viscous gas with regard to the roughness topology with the identification of procedure according to the experimental data has been developed. The new data about Re influence and about the roughness influence in the members of flowing part of small-flow-rate intermediate stage have been obtained. The new type of impeller, which allowed to increase the stage efficiency, has been offered. The recommendations have been introduced at the Sumy Production Union named after Frunze for the centrifugal compressors for 50 MPa and for 80 MPa, the procedures are used in the St.-Petersburg State Technical University. The introduction efficiency is the improvement of flowing parts of centrifugal compressors. The application field is the turbo-compressor-buildingAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio