Abstract
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.
Highlights
IntroductionThe complexity of the turbo machine geometry and the presence of moving elements inevitably lead to the need for segmenting the water-conveyance system
The complexity of the turbo machine geometry and the presence of moving elements inevitably lead to the need for segmenting the water-conveyance system. This is mainly due to the presence of stationary flow ranges in the turbo machine and the interloper channels rotating together with the impeller
One of the most common and effective approaches is a stationary cyclic formulation, in which it is assumed that the flows along all the interloper channels of the impeller are the same
Summary
The complexity of the turbo machine geometry and the presence of moving elements inevitably lead to the need for segmenting the water-conveyance system. This is mainly due to the presence of stationary flow ranges (a spiral chamber, a cascade of stator columns with blades of the guide device, a suction pipe) in the turbo machine and the interloper channels rotating together with the impeller. One of the most common and effective approaches is a stationary cyclic formulation, in which it is assumed that the flows along all the interloper channels of the impeller are the same. In order to transfer flow parameters from rotating segments to stationary segments and vice versa, their values are averaged in the circumferential direction [3,4]
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