IDENTIFICATION OF FEATURES AND REGULARITIES OF THE AMPLITUDE-FREQUENCY CHARACTERISTICS OF HYDRODYNAMIC SOUND OF LIQUID TURBULENT FLOW IN A PIPELINE

This article examines the features and regularities in the amplitude-frequency response of the hydrodynamic sound of liquid turbulent flow in a pipeline. The objective of the study is to develop a theoretical foundation for the creation of a high-precision in-line diagnostic device based on the analysis of acoustic signals. This requires identifying the features and regularities of the amplitude-frequency response of the hydrodynamic sound of liquid turbulent flow and developing a mathematical model of its origin during flow around various elements of a pipeline system. This paper analyzes the theoretical foundations of hydrodynamic noise generation in liquid turbulent flow in accordance with A. N. Kolmogorov's theory of turbulence. Numerical modeling using the COMSOL Multiphysics software package was used to test the hypothesis regarding the formation of characteristic stationary vortices on geometric inhomogeneities and defects. Numerical modeling yielded velocity distributions within the internal cavity of the studied objects, as well as the parameters (size and frequency) of stationary vortices generated in the areas of through faults and tee branches. The feasibility of identifying the location through faults and pipeline fittings based on the parameters of the stationary vortices they generate was theoretically substantiated and confirmed by numerical modeling. The obtained results form the basis for developing algorithms for analyzing diagnostic data from acoustic in-line devices, which will improve the accuracy and efficiency of leak and unauthorized tie-in detection.