Loss of Pressure in a Smooth Pipe With a Pulsating Turbulent Course

This article presents the results of experimental studies of a fully developed turbulent air flow in a round pipe with superimposed flow pulsations. The time-averaged static pressure losses and instantaneous velocity values on the pipe axis were measured in a wide frequency range of superimposed harmonic pulsations of the air flow in three modes for the average flow rate. Data were obtained and analyzed on the dependence of the conditionally averaged values of the pulsation component of pressure and flow velocity in various sections of the pipe. It is revealed a complex spatio-temporal structure of the flow, which is influenced by both resonance phenomena and transfer of parameter fluctuations in the direction of average motion. It is revealed a complex spatio-temporal structure of the flow, which is influenced by both resonance phenomena and transfer of parameter fluctuations in the direction of average motion. It is also revealed a non-monotomic dependence of pressure losses on the frequency of flow pulsations. The nature of the change in pressure loss from the frequency of flow pulsations remains almost unchanged when the average flow rate is varied. However, the analysis of the results of these studies left the relationship between the flow parameters in each cross section of the pipe under conditions of periodic flow pulsations. The goal of this article is to carry out this analysis.