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喷嘴在分层注入过程中起到调节聚合物分子量和压力损失的作用,而多级喷嘴的结构,由于分子链的逐级剪切作用,可在保证注入粘度的同时,更大的减小压力的损失.在此基础上提出变直径多级喷嘴的几何结构,利用Fluent数值模拟软件,对单级喷嘴、等直径多级喷嘴进行数值模拟,分析不同结构喷嘴对三元复合溶液速度、压力、湍动能以及平均应变速率的影响,结果表明随着流量的增大,三种结构喷嘴的压力损失和平均应变速率均增大,合理的变直径串联喷嘴可以达到与等直径串联喷嘴相同的注入效果,同时尺寸较小,方便工程应用.
The nozzle plays a role in regulating the molecular weight and the pressure loss of the polymer in the process of stratified injection. However, the structure of the multistage nozzle can be greatly reduced in pressure while ensuring the injection viscosity due to the stepwise shearing of the molecular chain The geometric structure of variable-diameter multistage nozzle was put forward.The numerical simulation of single-stage nozzle and equal-diameter multistage nozzle was carried out by using Fluent numerical simulation software to analyze the influence of different structure nozzles on the velocity, pressure, Turbulent kinetic energy and average strain rate. The results show that with the increase of flow rate, the pressure loss and average strain rate of the three kinds of structure nozzles increase, and a reasonable variable-diameter series nozzle can achieve the same injection effect as the equal-diameter series nozzle , While the smaller size, convenient engineering applications.