Abstract
The premixed abrasive jet possesses a strong strike ability and is widely used in oil and gas exploitation, machining, rust removal, and other fields. The superstrong, forceful impact of the premixed abrasive jet is mainly provided by high-speed abrasive groups. Hence, the abrasive velocity is the basis of this research, by applying the distribution law of abrasive impact force. In this paper, the particle velocity of the premixed abrasive jet is analyzed theoretically, and the corresponding particle velocity model is established. The real-time contrast interpolation method is employed to solve the problem of the variable drag coefficient. Factors such as the nozzle structure, average abrasive diameter, abrasive density, and jet flow are utilized to determine the abrasive velocity of the nozzle outlet. The numerical solution for the abrasive velocity is obtained by dividing the high-pressure pipe and nozzle into several sections, along the axis. Finally, the calculated particle velocity is compared with the particle image velocity measurement (PIV), to verify the correctness of the established model. These results demonstrate that the model calculation is in effective agreement with the experimental results. The deviation between the theoretical value and the experimental mean is 0.18 m/s. The standard deviation of the experimental results is 3.81-4.22 m/s, while the average error is less than 4%.
Highlights
Abrasive water jet technology has seen rapid development in modern times
It is well known that the striking force of the premixed abrasive jet is provided primarily by the abrasive itself and that the striking force is closely related to the speed of the abrasive
Research on abrasive jets has previously focused on experimental means and numerical abrasive assessments; this theoretical research does not provide a thorough understanding of these mechanisms
Summary
Abrasive water jet technology has seen rapid development in modern times. It is widely used in industrial cutting, tunneling, surface cleaning, and drilling applications [1,2,3] due to characteristics that include cold state, spot cutting, universality, good cutting quality, and strong cutting performance; this technology is environmentally protective and pollution-free. This method was simple to execute but was only capable of measuring jet velocity after the jet penetrated the workpiece These previous studies mostly treated the drag coefficient, a key parameter, as a constant and did not consider the influence of the Basset force on the abrasive acceleration; it was difficult to comprehensively analyze the problem of abrasive stress. Domestic and foreign scholars have conducted in-depth research on various flow fields by using PIV technology (particle image velocimeter) and, in doing so, have achieved productive results [18]. This technology provides for a type of noncontact measurement with large testing ranges and high precisions, which is widely used in various flow field tests. The influence of the resistance coefficient and the Basset force on abrasive acceleration can be assessed, and an abrasive movement differential equation can be developed, which is solved by an iterative algorithm to achieve a more comprehensive and accurate interpretation of the abrasive mechanism of acceleration
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