Study on Manganese Nodule hydrolifting system with the cooperation of air-lift pump and jet pump

1.目的：本研究的目的是研制一种气升泵和喷射泵相结合的锰结核水力举升系统，为锰结核的回收系统做出贡献。方法：为实现上述目标，组织了以下几个阶段。(1)气升泵扬水特性的数值模拟。(2)介绍了气液固三相流动的基本方程。(3)建立了垂直管内三相流流型的分类方法。(4)气升泵与喷射泵协同作用下的提水特性研究。结果：(1)为了用数值模拟来评价气升泵的扬水特性，需要得到气液两相流动的漂移速度和压力损失与液体流动的压力损失之比的关联式。A…S进一步强调了模拟的结果，证明了模拟结果与国家污染与资源研究所200m长提升管装置所获得的实验结果是一致的。(2)建立了考虑物质质量元径向分布的三相流一维基本方程。在应用这些方程时，还需要建立结构方程，包括漂移速度、质量分布、壁面剪应力和热流密度等参数。(3)利用压差波动概率密度分布函数与流型之间的关系，对垂直管内的三相流动进行了分类。由此关系可以看出，泡状流和弹状流分别呈单峰分布和双峰分布。这些分布之间的差异使得能够客观地对流型进行分类。(4)对气升泵和喷射泵联合作用下的提水特性进行了实验研究，考察了气升泵和喷射泵的连接顺序对提水特性的影响。结果表明，气升泵-喷射泵系统在提升水的特性方面比喷射泵-气升泵系统具有更高的效率。较少

1. OBJECTIVE : This research objective is to develop a manganese nodules hydrolifting system with the cooperation of air-lift pump and jet pump, and consequently to contribute to the manganese nodules recovery system.2. APPROACH : In order to approach the above mentioned objective, the following phases were organized. (1) A numerical simulation for the lifting characteristics for water with an air-lift pump. (2) Introduction of basic equations for gas-liquid-solid three phase flows. (3) Establishment of a method to classify the flow patterns of the three phase flows in a vertical pipe. (4) Investigation on the lifting characteristics for water under the cooperation of air-lift pump and jet pump.3. RESULTS : (1) In order to appreciate the lifting characteristics for water with the air-lift pump with the numerical simulation, it is necessary to obtain the correlations concerning with the drift velocity and the ratio of the pressure loss for gas-liquid flows to the one for liquid flows. A … More s the results of this simulation, the presented simulation proved to be accountable for the experimental results which were obtained through the apparatus with a 200m length lifting pipe at National Research Institute for Pollution and Resources. (2) One dimensional basic equations for three phase flows were presented with taking into account the radial distribution of the material mass elements. In application of these equations, the constructive equations were also required, which included the parameters such as drift velocity, mass distribution, wall shear stress and heat flux. (3) Three phase flows in a vertical pipe were classified by means of the relationship between the probability density distribution function of differential pressure fluctuations and flow patterns. It is demonstrated from this above relationship that a single-peak distribution and a bi-peak distribution indicate the bubble flow and the slug flow, respectively. This difference among these distributions enables to objectively classify the flow patterns. (4) The lifting characteristics for water under the cooperation of air-lift pump and jet pump were experimentally investigated, and the effects of the connecting order of these pumps on the characteristics was examined. As a results, it was confirmed that the system of air-lift pump-jet pump achieved higher efficiency in the lifting characteristics for water than the one of jet pump-air lift pump. Less