Abstract
In this article, the principle of aeration of aerator is analyzed through CFD simulation analysis and high-speed camera observation of aerator blades. Firstly, the flow field of oxidation ditch under the influence of a new curved blade aerator is simulated and analyzed. Then, the oxygenation performance of aerator under different operating parameters, that is different immersion depth and speed, is experimentally studied, and the structural optimization design of blade is carried out. Finally, the best parameters affecting oxygenation dynamic efficiency are obtained by fitting the experimental data, which provides a reference for the further optimization design of the aerator.
Highlights
There is a contradiction between oxygen charging, flow pushing, and energy consumption in the work of inverted umbrella aerator. e blade installation angle, blade number and blade design of inverted umbrella aerator, the rotating speed of aerator, and the immersion depth of impeller all have a certain impact on the oxygenation performance
For the deep water area below the blade, the red area with high turbulent energy does not appear in the deep flow field, most of the area is cyan, the intensity of turbulence kinetic energy decreases gradually with the increase of depth, especially the area of deep water near the wall (Figures 9(e) and 9(f)). e area with high turbulent kinetic energy is concentrated in the upper layer of the oxidation ditch flow field, in which the fluid will continue to be pushed by the blade, maintaining the state of high turbulent kinetic energy, and where the oxygen transfer efficiency is high, it appears in the area with strong turbulent dynamic energy
Observation of experimental phenomena found that when the impeller rotates at high speed, a large amount of liquid will be thrown from the junction of the blade and the plate to form a water curtain, the water curtain moves obliquely upward, contacts with the air, and under the action of gravity falls into the water, called the water leap phenomenon
Summary
First of all, using SOLIDWORKS software to model the aeration wheel and oxidation ditch, the aerator impeller has a maximum diameter of 90 mm, the height is 25 mm, the number of blades is 6, the blade inclination angle is 70°, and the middle opening diameter is 50 mm. E processed model is imported into ANSYS, the grid is divided using the fluent meshing feature, and the maximum mesh size of the stationary domain is set to 7 mm, rotating the domain. E final generated total number of grids is 2.71million, the three rotating domain grids are 40,000, the mass is 0.5 or more. E number of static domain grids is 2.59 million, with a mass of more than 0.8, which meets the grid quality requirements required for calculation.
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