| 摘要: |
| 传统喷砂在实践中多以经验为主，缺乏理论支撑。研究喷砂工艺的冲蚀磨损规律及其影响因素。在 CFD-DEM 耦合的基础上，引入 Archard wear 模型求解喷砂气固两相流对平板的冲蚀过程，预测颗粒冲击状态和冲蚀区域效果，研究不同的喷射角度、砂粒粒径及供砂速率对平板冲蚀深度总量的影响规律及其变化原因。结果表明：喷砂作用于平板形成的冲蚀区域形貌大致为盆地状，但又因喷射角度的不同会造成类椭圆形或类圆形区域。在控制单因素变量条件下，冲蚀深度总量随着喷射角度增大先缓慢增大至峰值，随后基本上呈线性减小，因此喷砂作业时应尽量保持倾斜，以喷射角度 50°为宜，另外，从能量出发，喷射角度 50°时法向-切向累积接触能量都相对较大；同时砂粒粒径在 0.25 mm＜d＜0.55 mm 范围内，冲蚀深度总量下降最快；冲蚀深度总量随供砂速率增大呈线性梯度增大。以数值模拟和试验验证相结合的形式给喷砂工艺提供了一种较为可行的研究方法。 |
| 关键词: 喷砂工艺 CFD-DEM 气固两相流 喷射角度 砂粒粒径 供砂速率 冲蚀深度总量 |
| DOI：10.11933/j.issn.1007?9289.20211207001 |
| 分类号:TP399 |
| 基金项目:国家自然科学基金(51775258)、辽宁省自然科学基金重点(20170540458)和精密与特种加工教育部重点实验室基金(B201703)资助项目 |
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| Sandblasting Erosion Characteristics Based on Coupled CFD-DEM Method |
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ZHOU Dapeng, MA Xuedong, CHEN Yan
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School of Mechanical Engineering and Automation, University of Science and Technology Liaoning,Anshan 114051 , China
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| Abstract: |
| The research of traditional sandblasting is mainly based on experience and lacks of theoretical support, so the erosion wear law and influencing factors of sandblasting technology are simulation studied. On the basis of CFD-DEM coupling, the Archard wear model is introduced to solve the erosion process of sandblasting gas-solid two-phase flow on the flat plate, and predict the impact state of particles and the effect of erosion area. The effects of different jet angles, sand particle size and sand supply rate on the total erosion depth of the flat plate and the variation reasons are studied. The results show that the shape of the erosion zone formed by sandblasting on the flat plate is basin shape, but it may be elliptic or circular due to the different jet angle. In the control of single-factor variable conditions, the total depth erosion with the injection angle increases first slowly to the peak, followed by a basically linear decrease. Therefore, sandblasting operations should be maintained as far as possible to tilt the angle of injection 50° is appropriate. In addition, from the energy point of view, the injection angle of 50° when the normal-tangential cumulative contact energy are relatively large. At the same time, sand particle size in the range of 0.25 mm |
| Key words: sandblasting technology CFD-DEM gas-solid two-phase flow jet angle sand particle size sand supply rate total erosion depth |
