微磨料气射流加工的混砂器磨料雾化数值模拟

Numerical Simulation of Abrasive Atomization of Mixing Abrasive Device in Micro-Abrasive Air Jet Machining

在微磨料气射流加工技术领域,微磨料混砂器是加工装备中的一个非常重要的功能部件。为了得到在混砂过程中混砂器内的颗粒雾化状态,基于气固两相流理论中的欧拉法和拉格朗日法,结合三维数值模拟技术对气喷射混砂器内的气固二相流进行数值模拟的研究,获得了不同的时间、压强等对混砂器内磨料的雾化混砂状态与规律。结果显示,当输入的气体时间在4s时,混砂器内颗粒雾化进入稳定状态;在时间以及气体流量不变的情况下,压强在0.5MPa-0.6MPa的范围,混砂器内颗粒的雾化效果较好。并通过实验对仿真得到的参数进行验证,结果证实了仿真的正确性。

In the field of micro-abrasive air jet machining technology,the abrasive device is a very important component in the processing equipment. In order to get the state of the abrasive atomization in the abrasive device, the case of abrasive atomization inside the abrasive device is studied based on Euler method, Lagrangian method and three-dimensional numerical simulation technique. It is demonstrated that the abrasive atomization is stable when the time of inputting gas is 4s; the abrasive atomization effect is the best when pressure is 0.5MPa-0.6MPa. These results are well confirmed by experiment if the time and the gas flow are unchanged.