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Документ Calculation of the real performance curve of radial flow fan impeller(НТУ "ХПИ", 2010) Kalmar, L.The main aim of this paper is to introduce numerical procedures to calculate the real performance curve of a cylindrically bladed radial-flow fan-impeller. The characteristics of the flow belonging to different duty points of the fan also were determined by the numerical procedure. In this calculation, the blade effects as well as the effects of the fluid friction and the turbulence were taken into consideration separately. The effects of the blade were represented hydro-dynamically by a constrain force field. The frictional effect of the fluid and the turbulence of the flow were reflected by the analogy between the flow in a rectangular channel and the flow in the bladed space of the impeller. Distributions of the relative velocity, pressure and energy loss are calculated. By determining the energy loss belonging to different volume rates an approximate real performance curve of the impeller can also be determined belonging to different roughness of the inner surfaces of the impeller.