Abstract
In order to improve the life cycle and cutting ability of a suspension abrasive water jet nozzle at the same time, hydrodynamics technology, an enumeration method and multiparameter orthogonal optimization are used to optimize the nozzle section geometry, taking the inlet diameter coefficient of the nozzle, the axial length coefficient of the contraction section and the contraction section curve as optimization variables, and selecting the peak velocity and the unit flow erosion rate as the indicators, it is concluded that the optimal contraction section curve is a Widosinski curve, the optimal inlet diameter coefficient of the nozzle is 0.333 and the optimal axial length coefficient of the contraction section is 2.857. Compared with the commercial product single cone nozzle, the performance of the optimal section nozzle improves by 5.64% and the life cycle increases by 43.2%. On this basis, the effects of operating parameters, including inlet pressure, abrasive particle flow rate and abrasive particle size, are further studied. It is determined that the optimal section nozzle has the best performance under the above operating parameters. It is demonstrated that by optimizing the nozzle section geometry, the cutting capacity and life cycle of the nozzle are improved, the performance of the nozzle can be significantly improved and the optimization of the performance of the nozzle is realized.
Highlights
Academic Editor: GianniThe suspension abrasive water jet cutting system is mainly composed of a booster pump, an abrasive water jet nozzle, an abrasive tank, an abrasive concentration regulator, etc
The abrasive particles are subjected to the combined effects of inertial force, causing the abrasive particles to collide with the runner, which is the main cause of nozzle wear
This paper proposed an optimization method for the nozzle geometry of a suspension water jet on the basis of the enumeration method and multiparameter orthogonal optimization
Summary
The suspension abrasive water jet cutting system is mainly composed of a booster pump, an abrasive water jet nozzle, an abrasive tank, an abrasive concentration regulator, etc. The abrasive particles are subjected to the combined effects of inertial force, causing the abrasive particles to collide with the runner, which is the main cause of nozzle wear At this stage, there are two methods to improve the life cycle of the nozzle. In order to study the motion characteristics of abrasive particles and the wear mode of nozzle, Du, MM et al established the whole process simulation model from high-pressure water and abrasive particles entering the nozzle to the impact of mixed abrasive jet on the workpiece based on SPH-DEM-FEM method. In order to expand the scope and depth of research on suspension abrasive water jet nozzles, this paper uses CFD software as a simulation tool and optimizes the nozzle section geometry by combining the enumeration method and multiparameter orthogonal optimization, with the minimum runner erosion and maximum peak velocity as the dual optimization objectives
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