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The article deals with mathematical modeling of non-stationary processes non-periodic pressure of the fluid in cylindrical tubes. Based on the Navier-Stokes equations for compressible fluid withdrawn simplified equation for the case of long pipes. It is shown that modeling of single processes, these equations contain only one dimensionless parameter. Identifies conditions which may further simplify these equations to a form that does not contain a dimensionless parameter.

Based on the analysis of scientific papers and experimental studies conducted clarify the application of compressible and incompressible problems in unsteady fluid flow in the pipeline. It is shown that in such flows in insufficiently taken into account all the forces arising in unsteady flow. Investigated pulse pressure and compression of fluid in such flows.

This paper describes the design and principles of operation of electromagnetic flow meter designed to measure rapidly varying velocity of unsteady fluid flow. The selection of a homogeneous magnetic field and point electrodes in the flow sensors ensured the independence of the testimony from the plot of velocity.Applies a comprehensive approach to the measurement of non-stationary medium speed with an electromagnetic method. The full description of the electromagnetic flowmeter with an increased frequency of the power converter.