Abstract
Traditional dredging methods often have problems such as low dredging accuracy, serious silt escape and siltation, high maintenance cost, and limited use. The airlift dredging system has the characteristics of simple structure, low maintenance cost, no mechanical moving parts, no need to consider lubrication and wear problems, high work safety and reliability, and is suitable for river and lake reservoir dredging projects with high environmental protection requirements and large dredging depth. In order to further explore the internal flow mechanism and hydraulic characteristics of the air lift pump, in this paper, an experimental bench of the air lift pump is built. The diameter of the lifting pipe is 30 mm and the length of the pipe is 2320 mm. The gas-liquid two phase flow and gas-liquid-solid three phase flow experiments are carried out for the system, the change rules of liquid lifting flow, solid lifting flow and lifting efficiency are obtained. Besides, based on Fluent software, the three-dimensional numerical simulation of gas-liquid two phase flow in the system is carried out, and the numerical simulation results are in good agreement with the experimental results. The research results of this paper provide theoretical guidance for the design optimization of airlift pump, and lay a foundation for the popularization and application of air lift technology in the field of dredging.