Waste collection performance of the octagonal aquaculture tank driven by submersible flow propellers

In order to explore the characteristics of waste collection in the octagonal aquaculture tank under the action of submersible flow propellers, this paper uses the method of physical model test to study the different deployment angle θ and the installation distance ratio d/a of the submersible flow propellers (the perpendicular bisector pattern: d1 is the distance between the midpoint of the impeller axis of the propeller and the nearest tank wall, a1 is the length of the long side of the octagonal culture tank; the diagonal pattern: d2 is the midpoint of the impeller axis of the propeller and the nearest short side, a2 is the distance between the sewage outlet of the octagonal aquaculture tank and the nearest short side), the number of flow propellers n and the influence of the layout mode on the collection of waste in the octagonal aquaculture tank. In the experiment, a high-definition camera was used to record the distribution of waste in the culture tank, and MATLAB was used to analyze and calculate the distance between the waste and the center of the tank. In the test, by comparing the maximum value of the distance between the waste and the center of the tank under different working conditions, the pros and cons of the waste collection performance of the aquaculture tank were measured. The results show that the deployment angle θ of the submersible flow propeller, the installation distance ratio d/a, the number of flow propellers n and the arrangement mode all affected the effect of the accumulation of waste in the aquaculture tank; when the deployment angle θ of the device was 45°, the waste collection effect was the best, and when the deployment angle θ was greater than 70°, with the increase of the layout angle, there would be dead corners of waste collection around the octagonal aquaculture tank, the distance between the residual bait and the feces from the center of the sewage outlet increased, and the degree of feed dispersion also become larger; under the working conditions of 30°, 40°, 45°, and 50°, the effect of waste accumulation gradually increased with the increase of the installation distance ratio d/a. When the installation distance ratio is 1/2, the waste collection effect is the best. The waste collection performance of the aquaculture tank increased with the increase of the number of submersible flow propellers, especially when the number of submersible flow propellers increased from 1 to 2. However, after the continuous increase, the waste collection performance was no longer significantly improved. Under equal conditions, the waste collection performance of the aquaculture tank in the diagonal layout mode was obviously better than that in the perpendicular layout mode. The research results can provide basis and guidance for the layout of submersible flow propellers in octagonal aquaculture tanks.