摘要
该文介绍一种在气固两相流中的弯管抗磨技术:肋条弯管.在这种弯管中,具有一定截面几何形状(方形或矩形)的肋条按一定间距分布在直角弯管内20°～80°的外侧壁上.文中运用数值试验的方法对该项技术进行了研究.数值试验分两步进行,先对气流场采用欧拉法进行数值模拟,再用拉格郎日法对颗粒进行跟踪.计算中对颗粒碰撞壁面的速度和角度进行了统计,从根本上揭示了肋条弯管比光滑弯管抗磨的原因.计算结果表明,在相同条件下,肋条弯管的磨损率只是普通弯管的1/3,与实际数据相吻合.该项研究为生产实践中弯管易磨损的难题提供了较有价值的参考.
The present paper introduces a new anti-erosion bend in gas-particle flows: ribbed bend. Ribs with certain geometric cross section (square or rectangle) are fixed on the outer wall of the bend from 20?to 80?with certain interval. Pneumatic conveying in ribbed bend was simulated by numerical simulation, using Euler / Lagrange approach for the calculation of the continuous and dispersed phase, respectively. Detailed analyses involving the impact velocity and incidence angle of particle-metal (either particle-rib or particle-duct) impact unveil the mechanism of the anti-erosion effect. Both experimental and numerical results meet well with each other. As a result, predications achieve that the average erosion rate of the ribbed bends is only a third of the bare bend under test conditions. The present paper provides valuable reference for practical production in protecting bends from erosion in gas-solid phases.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第5期134-138,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(59976036)
浙江省自然科学基金项目(50069)。
