摘要
在综合考虑入口压力、不同喉部直径、不同入口加氧量、液体可压缩性以及湍流作用等情况下,以文丘里管喉部压力小于等于相应温度下的饱和蒸汽压为依据,设计了空化装置。基于连续性方程、伯努利方程、空化泡动力学方程求解了空泡径向非线性方程。采用计算流体软件FLUENT以文丘里管不同入口压力、喉部直径和入口加氧量等为变量进行了单因素数值模拟试验,获得了文丘里管反应器内空泡的成长与溃灭特性,分析了湍流作用下入口压力及不同喉部直径对空化泡运动特性及其所形成压力脉冲的影响规律。搭建水力空化装置试验台对污水进行处理测试,试验处理结果表明:对石油污水处理后COD(chemical oxygen demand,化学需氧量)降低41.14%,对造纸厂污水处理后COD降低63.83%,说明空化反应器合适的结构参数和控制参数有利于提高空化强度。
Under the comprehensive consideration of inlet pressure,different throat diameter,different inlet oxygen content,liquid compressibility and turbulence,on the basis of the pressure of the Venturi tube throat pressure less than equal to the saturated vapor pressure at the corresponding temperature,the cavitation device for Venturi tube was designed.The nonlinear equation of the cavitation is solved on the basis of the continuity equation,Bernoulli equation and cavitation bubble dynamics equation.Single factor numerical simulation was carried on with the inlet pressure,throat diameter and inlet oxygen content as variable by means of the computational fluid software FLUENT.The property of growth and collapse of bubbles in Venturi tube cavitation reactor was obtained.The influence of the inlet pressure and the throat diameter on the motion characteristics of the cavitation bubble and the pressure pulse formed under the action of turbulence was analyzed.Finally,a set of hydraulic cavitation test device was established.Experimental results show that after processing COD(chemical oxygen demand,COD)of oil sewage decreases by 41.14%,COD of paper sewage decreases by 63.83%.the appropriate structural parameters and control parameters of the cavitation reactor are conducive to the enhancement of the cavitation intensity.
作者
王泽鹏
边昭斌
苗展丽
赵辉
WANG Zepeng;BIAN Zhaobin;MIAO Zhanli;ZHAO Hui(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266061,China)
出处
《青岛科技大学学报（自然科学版）》
CAS
2019年第1期99-104,共6页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
国家自然科学基金项目(51576102)
关键词
湍流
水力空化
气泡动力学
文丘里管
turbulence
hydraulic cavitation
bubble dynamics
Venturi tube
