Numerical Simulation And Experimental Research Of Cavitation Jet Cleaning In Pipelines

In the development process of industrial production, the impact of pipeline scaling phenomenon has been one of the main factors affected pipeline transport capacity and cycle. In oil supply system, water supply system, drainage system and urban water pipeline networks, pipelines are used in a large amount. They are long and underground. So researching on a new type of cleaning process is of great significance. In this paper, study focused on vane cavitation water jet cleaner. Low pressure generated in the tip of the flow field and cavitation bubbles grow up in these areas when using cavitation cleaner jet cleaning. And with the movement of water, vacuoles collapse in the near of the pipe wall, making dirt off.This paper begins with the cavitation cleaner and the theoretical analysis of cleaning mechanism. Throttling gap between the cleaner and the pipe wall is the main reason of cavitation. In thinking of the parameters of bend angle 9, blade thickness T, width L and the number of blades N, got different effects of cavitation cleaning. Ensured cleaning throttle angle, cross-section shape and size is the cleaner design principles in different pipeline cleaning and washing conditions.The study focused on blade-type cavitation cleaner, using three-dimensional periodic model, combined with structured and unstructured grids, analyzed the two-phase Singhal cavitation model in a finite volume CFD way. By took turbulence intensity and non-condensable gas into account, the cleaning mechanism was analyzed and flow characteristics were gain. The cleaning intensity varied with the gap throttling effect of the cleaner, consistent with theoretical conclusion.In this paper, we built experimental platform of cavitation cleaning, and high-speed camera was used to study the cavitation bubbles occurred in blades tip flow field. Methylene blue spectrophotometric method was suited for measuring the content of hydroxyl radicals generated in the cavitation process. Research showed that the experimental was consistent with the simulation and theoretical results. Parametric study provided technical support for engineering design and pipeline cleaning.