FIELD: aero-engine manufacture; development of fans for gas-turbine engines, turboprop engines to replace propeller, propeller/fans for turboprop/fan engines, fans for wind tunnels, facilities for handling liquids and gases and for vacuum treatment. SUBSTANCE: additional reduced static pressure is built up downstream of fan impellers by raising axial speed of flow from impeller to impeller; fan thrust is calculated for any of its operating conditions using equation 
, where R is fan thrust; Pnd is nondisturbed medium pressure; Fia is inlet area; 
are fan outlet pressure and area, respectively. EFFECT: improved thrust, simplified design, improved reliability and safety in operation due to elimination of gasodynamic instabilities. 1 dwg
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