Fesenko K. Calculation and Theoretical Studies Method of Centrifugal Blower Stages Flow Structure and Characteristics

The object of the study is gas dynamic processes in the centrifugal blower stage. The purpose of the study is the investigating method developing of the axisymmetric flow structure in centrifugal blowers' stages with radial impeller vanes and their overall characteristics to find ways of improving the operation of these stages. Research methods: flow parameters in a stage are defined by the system of Euler equations, recorded with usage of the stream function; the system is solved by finite - difference approach; verification of the calculation results is carried out by comparison with experimental data. Theoretical and practical results: the creation of software for studying of the axisymmetric subsonic flow structure in the centrifugal blowers' stages flow paths. The scientific novelty of the work lies in the fact that for the first time: - the calculation method for the study of the flow structure and characteristics of the centrifugal blowers' stages with radial impeller vanes was proposed, which allows to define in a wide range of operating conditions characteristics and circumferentially averaged compressible subsonic flow structure; - obtained by calculation gas-dynamic parameters of the centrifugal blowers' stages with radial impeller vanes, which revealed the impact of operating mode on the flow structure, blade rows flow and the coordination of their work; - new data about the impact of the flow path geometric parameters changes as well as profiles of impellers and guide vanes on the flow structure and stages overall characteristics were obtained and recommendations for their improvement were given. Degree of implementation: software package and the results of numerical studies used in the practice of JSC "Motor Sich" (Zaporizhya), JSC "Turbogaz" (Kharkiv) and used in the educational process of the aircraft engines theory department of the National Aerospace University named after Zhukovsky "KhAI". Application is in research, design and other relevant organizations of power engineering industry.