双侧吸气射流增氧机内吸气作用的分析

Analysis on inner aspiration of dual laterolog aspirating aerator

为提高射流增氧机的吸气效率,在其射流器喷嘴内增设吸气管以增加一次吸气。利用流体分析软件,结合试验现象,对内吸气部位的流场进行了CFD三维仿真及分析,从压力分布、流体流速与流动方向两方面,计算分析喷嘴及内吸气管内部的液、气两相流体运动规律,以判断喷嘴内能够形成吸气的条件及吸气状况。结果证明当位置系数在一定范围内变化时,内吸气管确实发挥了吸气作用,当内吸气管轴向位置系数R=0,射流器喷嘴内吸气作用达到最佳效果,而当R=1时,射流器喷嘴内吸气作用最差。此外,对不能形成吸气的情况进行了对比研究。

In order to improve aspiration-efficiency of the jet aerator,an air-in pipe called inner pipe was set up to add one more aspiration in the aerator muzzle.Based on the CFD software FLUENT as well as experiments,the aerator internal fluidic field was computed and aspirating was analyzed.Conditions and status on inner aspirating were investigated in terms of pressure distribution,flowing velocity and volume fraction of air and water.Conclusions were drawed as follows：When the inner pipe was moved along the aerator axis among a certain range,it had an apparent impact on aspiration efficiency.If the axial location coefficient R equalled 0,the dual laterolog aspirating aerator reached its highest aspiration efficiency.Contrarily,while R=1,the aerator had its lowest aspiration efficiency.Furthermore,contrastive studies were carried out under conditions of no aspiration.