电机转速对文丘里混合充氧机工作性能的影响

Effect of motor speed on working performance of Vacuum-type mixed oxygenator

为了解决传统混合充氧机能耗高、水下安装维护难的问题,研制了新型文丘里混合充氧机,重点研究了电机转速对文丘里混合充氧机工作性能的影响。结果表明,在电机转速200~1 400 r/min条件下,文丘里混合充氧机的循环水量与电机转速呈线性关系;建立了基于气泡羽流模型的径向混合水流运动模型,并利用实测流速数据优化了水流的能量损失系数及夹带系数,成功模拟了不同电机转速条件下的径向水流速度分布;研究了不同电机转速条件下的有效混合半径,确定了文丘里混合充氧机的合适安装间距。电机转速400~1 200 r/min条件下,当电机转速逐渐增大时,水体复氧速率、氧的总传质系数和氧的传质效率均随之增大,混合充氧性能随之改善。

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.