Design and experiment of deep selfsuction submersible aerator
Chen Bin1，2， Zhang Kewei3， Shi Weidong1, Wu Gang2， Huang Xuejun2
（1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Pump Engineering and Technology Research Center of Nanjing, Nanjing, Jiangsu 211500, China; 3.School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China)
Abstract：In order to improve the deep aeration performance of a self-priming submersible aerator and improve its oxygenation capacity and power efficiency in deep diving, a new prototype was designed and its performance was researched. Based on the structural character and jet principle of submersible aerator, a series of tests with various nozzle shapes, throat pipe length, working pressure and flow rates were conducted under different area ratio value of 2.25,4.00,5.06 and 6.25,respectively. The curve of flow ratio and pressure ratio were obtained and the best performance curve was fitted, by which the basis for the optimal design was identified. Based on flow ratio and the best performance curve, the corresponding pressure ratio and area ratio can be accordingly figured out to determine reasonable working conditions of submersible pump and geometry of aerator. A prototype was designed and tested, and the results showed that the maximum diving depths increased to 10 meters. Under the water pressure of 10 meters, the gas liquid mixing was uniform, the jet was powerful with P =7.5 kW, and inlet air flow rates reaches 122 m3/h. Fine and even bubbles were developed and had longer residence time. The efficiency of the dissolved oxygen and sewage water treatment was improved, while the tank of aerobic treatment may be appropriate deepen.
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