Abstract:In order to solve the problems of high energy consumption and difficult underwater installation and maintenance of traditional technologies, a new Vacuum-type mixed oxygenator was developed, and the effects of motor speed on its working performance was mainly studied. The results show that the circulating water of the Vacuum-type mixed oxygenator has a linear relationship with the motor speed under the conditions of 200~1 400 r/min. A radial mixed flow motion model based on the model of air-bubble flow is established. Based on the measured flow velocity data, the energy loss coefficient and entrainment coefficient of water flow were optimized, and the radial flow velocity distribution under different motor speed conditions is successfully simulated. The effective mixing radius under different motor speed conditions was studied, and the suitable installation space of the Vacuum-type mixed oxygenator was determined. Under the conditions of motor speed 400~1 200 r/min, when the motor speed gradually increases, the rate of reoxygen in the water body, the total mass transfer coefficient of oxygen, and the mass transfer efficiency of oxygen all increase, and the performance of Vacuum-type mixed oxygenator was improved.