关键词: 旋动射流混药器, 脂溶性农药, 收缩管螺距, 分流器位置, 结构优化

Abstract: The main components of swirling jet mixer are spiral curved shrinkage tube, mixing tube and shunt. The pitch of spirally curved shrinkage tube and the position of shunt in mixing tube directly affect the structure of swirling jet mixer. In order to analyze the  influence of swirling jet mixer among the pitch of shrinkage tube and the position of shunt on mixing uniformity, the structure of the mixer were optimized by orthogonal experiments with two factors and three levels. A computational fluid dynamics program (FLUENT) was used to simulate the flow field inside the swirling jet mixer to optimize its design. The mixture uniformity was evaluated by  the uniformity index (γa), for which, the two liquids were blended homogenously when γa was near to 1. Simulated results briefly showed as follows: Spiral curved shrinkage tube improved mixing uniformity of swirling jet mixer, but it was not significant. When the shunt was located at the inlet, middle and outlet of the mixing pipe respectively, it had little effect on the mixing uniformity of fat-soluble pesticides, and the mixing uniformity of the mixer was basically the same. The mixing uniformity of the swirling jet mixer was the best with three times the pitch of the helical bending shrinkage tube and the shunt in the middle of the mixing tube.

Key words: swirling jet mixer, fat-soluble pesticide, shrink tube pitch, splitter position, structural optimization