In order to reduce the fiber diameter and the energy consumption in the meltblowing process, a modified slot die with two blocks was designed in this article. The numerical calculation and the experimental verification of the airflow field under the modified slot die were carried out, and the effect of the block structure parameters on the air field was investigated. The research results indicate that compared to the common slot die, the modified slot die with the blocks could increase the velocity on the spinning line and reduce the rate of the temperature decay on the spinning line. When the block width and the block inclination angle lower, and the block height expands, it could increase the peak of the air velocity, the temperature and the turbulence intensity on the center line of the air field under the modified slot die. The average velocity on the spinning line of the modified die under the conditions of block width = 20 mm, block height = 30 mm and block inclination angle = 60° is the highest.

为了减小熔喷过程中的纤维直径和能耗，本文设计了一种改进的两块缝口模头。对改进后的槽模下的气流场进行了数值计算和实验验证，研究了砌块结构参数对气流场的影响。研究结果表明，与普通槽模相比，改进的带块槽模可提高纺丝线上的速度，降低纺丝线上的温度衰减率。当砌块宽度和砌块倾角减小，砌块高度增大时，可以增加改进型缝模下气场中心线上的风速峰值、温度峰值和湍流强度峰值。