大喷嘴充气器充气性能的仿真研究

Simulation Researchon Big Nozzle Sparger Aerating Performance

本文简要介绍了大喷嘴充气器的工作原理及充气性能的表征参数,利用流体仿真软件建立了基于实际工况的大喷嘴充气器仿真模型,重点研究了大喷嘴充气器在实际工作参数即充气压力和浸没深度条件下的气流喷射长度、末端扩散宽度与喷气流量的变化规律。结果表明,在同一浸没深度条件下,随着充气压力的增大,大喷嘴充气器的三个性能参数都相应增大,同时得到在实际浸没深度量值时,浸没深度对喷气流量的影响不可忽略;在同一压力条件下,随着喷嘴浸没深度的增加,喷气流量和气流喷射宽度在减小,气流喷射长度也在相应的减小。本文的研究为大喷嘴充气器在实际应用中工作参数的选取提供重要的数据支撑。

In this paper,the working principle and the characterization parameter of aerating performance of the big nozzle sparger are briefly introduced,and the simulation model of the big nozzle sparger is es-tablished by using the fluid simulation software based on the actual working conditions.The variation rules of the air injection length,airflow tip diffusion width and the jetting outflow of the big nozzle sparger are studied emphatically under the actual working conditions which are the aeration pressure and immer-sion depth.It is shown that three performance parameters of big nozzle sparger increase with the increase of the aeration pressure under the same immersion depth,and the effect of the immersion depth on the jetting outflow can not be ignored when the immersion depth reaches the magnitude of the actual immer-sion depth.Under the same pressure condition,with the increase of the immersion depth of big nozzle sparger,the jetting outflow and airflow tip diffusion width gradually decrease,and the air injection length also gradually decrease.The research of this paper provides important data support for the selection of working parameters of big nozzle sparger in practical application.