Study On The Mechanism Of Destratification Of The Nourishing Water Machine System

For a long time,the problem of water stratification in closed water environment is the key cause of water pollution and endangering aquaculture.Effective removal of water stratification is a hot issue for scholars’at this stage.to this issue,our team developed a new water quality control facility-the Nourishing Water Machine System.It has good water quality regulation effect and has been applied in batches by many aquaculture enterprises in Dalian.But the mechanism of breaking water stratification hasn’t been studied.This experiment simulates the working process of the Nourishing Water Machine System in flume.We study how it breaks water stratification and set up multiple sets of configurations to understand their impact on disrupting water layers including flows,Salinity differences,distances and angles.We monitor the salinity value of 5 water layers in real time through multi-channel salinity online sensors,According to the monitoring results,the change law in the process of breaking the stratification is studied and further analyzed.The result is shown below.1.As the Nourishing Water Machine System outlet flow increases,the time to break the stratification decreases.It took the longest time to break the stratification when the water outlet flow of the water raising machine was 25L/h.It took the shortest time to break the stratification when the water outlet flow of the water raising machine was 100L/h.The functional relationship of it breaks water stratification time（y）and flow（x）as:y=0.0544x²-9.72x+506;The functional relationship between the time point（y）of each water layer and the flow rate is:y_底层=559.66x-0.85,y_次底=5.3*10^-5x³-0.0088x²+0.427x,y_次表=1625x-0.932,y_表层=0.0292x²–5.366x+291.75.2.As the salinity difference of stratificated water narrow,the Nourishing Water Machine System de-stratification time is shortened first and then.The de-stratification time was gradually shortened when the salinity difference narrows from 40 down to 20,and the de-stratification time was slightly extended when salinity difference was 20 compared to 10.The functional relationship of it destratification time（y）and flow（x）as:y=0.008x³-0.655x²+14.85x+133.The functional relationship between the time point（y）of each water layer and the flow rate（x）is:y_底层=-0.0022x³+0.18x²–4.8833x+46,y_次底=0,y_次表=-0.0053x³+0.365x²–7.8167x+140,y_表层=-0.0067x³+0.435x²–9.0833x+242.3.As the Nourishing Water Machine System vertical distance of the water outlet increases,the de-stratification effect is weakened.When the vertical target distance of the water outlet was set at-39.00cm,the de-stratification was the strongest.When the vertical target distance of the water outlet was set at-20.00cm,the de-stratification was the weakest,layers were not fully mixed.As the horizontal target distance of the water outlet gradually extended,there was no significant difference in de-stratification.The functional relationship of destratification time（y）and flow（x）as:y=-256x³+472x²-258x+218,The functional relationship between the time point（y）of each water layer and the flow rate（x）is:y_次底=-21.333x³+40x²-24.667x+7,y_底层=-85.333x³+136x²-64.667x+16,y_次表=-341.33x³+584x²–284.67x+100,y_表层=-544x³+1032x²-576x+233.4.As the Nourishing Water Machine System outlet angle increases,the delamination effect is gradually enhanced.When the outlet angle was 45°,the mixing effect was the weakest,layers are not fully mixed.When the outlet angle was 135°,the mixing effect was the strongest.