新型供气式低压射流曝气器的结构设计与模拟优化

Structure Design and Simulation Optimization of a New Air-supplied Low Pressure Jet Aerator

为了提升供气式射流曝气器的混合效果和充氧效率,本课题根据各种氧传质机理对结构进行重新设计,提出进气管小孔出气等优化改进方案。通过数值仿真分析软件(Solideworks)建立三维模型,使用Fluent软件模拟分析结构合理性和各种结构参数对湍流混合效果的影响。本课题对比了第一代和第三代新型曝气器的流线图。最终水相体积分数仿真结果表明,新型曝气装置的设计结构合理且混合效果有了显著提升,第三代低压供气式射流曝气器的最佳参数为一级管径86 mm,一级喷嘴直径36 mm,进气管直径20 mm,进气管长82 mm,混合室直径140 mm,混合室长400 mm,二级喷嘴直径55 mm,开孔孔径3 mm,开孔规模为均匀分布7列,每列8个。

In order to improve the mixing effect and oxygenation efficiency of air-supplied jet aerator,the structure of which was redesigned according to various oxygen mass transfer mechanisms,and the optimizized scheme such as small hole outlet on inlet pipe was proposed.The three-dimensional model was established using numerical simulation and analysis software(Solidworks),and Fluent software was used to simulate and analyze the structural rationality and the influence of various structural parameters on the turbulent mixing effect. This study compared the streamline diagrams of the first-generation and the third-generation new aerators. The simulation results of water phase volume fraction showed that the design structure of the new aerator was reasonable and the mixing effect significantly improved. The optimized parameters of the third-generation air-supplied low pressure jet aerator were as follows:diameter of primary pipe,primary nozzle,and inlet pipe of 86,36,and 20 mm,respectively,inlet pipe length of 82 mm,mixing chamber diameter and length of 140 and 400 mm,respectively the secondary nozzle diameter of 55 mm and opening diameter 3 mm. The opening distribution was 7 columns evenly distributed with 8 holes in each.