渐缩型气动喷砂喷嘴冲蚀模拟分析

为研究气动喷砂枪喷嘴喷射颗粒对自身造成的冲蚀磨损情况,通过选取渐缩型气动喷砂喷嘴为研究对象,运用CFD软件对其内部流场及颗粒运动特性进行模拟分析;通过改变收缩角度、颗粒粒径及颗粒质量流率进一步分析影响喷嘴冲蚀速率变化的规律。结果表明:喷嘴的冲蚀区域主要集中在收缩段及收缩段与出口段交界面处;以收缩角度为30°、45°、60°的喷嘴为例,随收缩角度的增加,冲蚀区域出现"逆向发展";随颗粒粒径的增加,喷嘴最大冲蚀速率呈现先下降后上升的"U"形变化趋势,且其最低点所对应的粒径与收缩角度成反比;随颗粒质量流率的增加,喷嘴最大冲蚀速率呈上升趋势,但并未呈现线性关系。

Erosion Simulation Analysis of Tapered Pneumatic Blasting Nozzle

In order to study the erosion wear caused by the sprayed particles of the pneumatic blasting gun nozzle, we used the tapered pneumatic blasting nozzle as the research object, and use CFD software to simulate the internal flow field and particle motion characteristics; The shrinkage angle, particle size and particle mass flow rate were further analyzed to affect the variation of nozzle erosion rate. The results show that the erosion area of the nozzle is mainly concentrated at the interface between the shrinkage section and the shrinkage tube and the outlet section. For example, nozzles with shrinkage angles of 30°, 45°, and 60°, as the shrinkage angle increases, the erosion area appears. "Reverse development"; with the increase of particle size, the maximum erosion rate of the nozzle shows a "U"-type change trend of decreasing first and then rising, and the maximum erosion rate of the nozzle with different shrinkage angles is "lag" at the minimum position; With the increase of particle mass flow rate, the maximum erosion rate of the nozzle is increasing, but there is no linear relationship.