基于Polyflow的缓凝砂浆在螺旋槽中的流场模拟

Polyflow-based flow field simulation of postponed-set mortar in screw channel

针对缓凝预应力筋包覆装置连续作业的可靠性问题,在包覆试验研究基础上,采用流体力学和流变学理论与计算方法,运用Polyflow等软件,建立了螺旋输送的物理模型、几何模型以及有限元网格模型,结合假设和边界条件,对宾汉姆流体的缓凝砂浆在螺旋槽内的流动和变形进行了计算流体力学(CFD)模拟,并得到了可视化流场。分析结果表明,在不同螺杆转速下,缓凝砂浆在螺槽中出现完全流动状态或"塞流"的固体输送状态,验证了包覆试验现象,同时为机件的优化与设计提供了依据。

Aiming at the reliability of postponed-set mortar（PSM） successive coating on prestressed strand,on the basis of coating experiments,the physical,geometric and finite element lattice models of screw conveying were built by using Polyflow software,etc..The hypothesis and boundary conditions were given,the flow and deformation for PSM with Bingham liquid in screw channel were simulated and a visualized field was obtained by computational fluid dynamics（CFD） method.The simulative results indicate that the existences of fully flow or plug flow state for PSM at the different screw revolution are demonstrated in screw channel.The coating experiments are verified and the foundation of optimization design for the machine part is provided.