The select results of experimental investigations of the cross flow fan functional models made of different plastics have been presented in this paper. An analysis of the possible effects of an appearance of unprofitable (undesirable) flow phenomena influencing on a decrease of cross flow fan efficiency has been carried out. An influence of a kind of plastics used as constructional materials of this two steps flow machine as well as an interpretation of its influence on the dimensionless coefficients characterizing a cross flow fan performance have been considered.
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