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The article presents the results of mathematic simulation to determine the effect of geometric parameters, coaxially installed impellers, a centrifugal turbo machine on the developed pressure, depending on the mode of operation (frequency and relative direction of the impellers rotation). It is established that irrespective of the operation mode, the influence of the circumferential velocity, the ratio of the input and output diameters and the width of the impeller on the value of the pressure developed by the turbo machine is invariable. While the influence of the density of the blades system decreases with the counter rotation of the impellers.

Mathematic simulation of the power interchange in the interbucket space of coaxially located impellers of the centrifugal turbo machine