Numerical Simulation of Flow Velocity and Silver Ion Concentration Distribution in Sterilization Moduleormalsize
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摘要: 无菌水是载人航天器生命健康的保障条件.灭菌模块安装在水处理系统末端，向净化水释放规定浓度的银离子，起到杀菌和长期保存作用，使净化水达到饮用水质标准.水流过金属壁面，根据交换流域采用标准k-ε模型标准壁面函数，针对600mL·min-1流量工况建立流场和银离子浓度场的计算模型.灭菌模块阴阳电极30s交替互换牵引浓度变化.为符合实际工况，建立模型时通过反复迭代的方式进行求解.对流速和银离子产生速率的结果进行分析发现，银离子浓度最高部位均出现在阳极表面附近，阴阳极反复转换可有效降低电极表面附近的银离子浓度.结合理论计算结果可知，灭菌模块工作过程中不会有AgOH沉淀析出，从而确定工艺参数，指导工程设计.根据仿真结果分析给出了灭菌模块优化建议.Abstract: Future manned spacecraft needs to provide a long-term working environment, in which sterile water is the guarantee of life and health. The sterilization module is installed at the end of the water treatment system to release the specified concentration of silver ions to the purified water, playing a role of sterilization and long-term preservation of the water. According to the exchange basin using standard k-ε model standard wall function, the calculating model of flow field and concentration field of silver ions have been set up for the 600mL·min-1 flow condition as the water flows through the wall. The sterilization module electrode alternating exchanges with 30s period, and draws the concentration change. For meeting the actual conditions, the model is solved by iterative method. By analyzing the production rate of silver ion velocity, the highest concentration of silver ions locates at the anode surface near the cathode. Anode-cathode converting repeatedly can effectively reduce the silver ion concentration near the electrode surface. That is, the conversion has transmission effect to the decreasing of silver ion concentration, and can be carried out repeatedly. There is no AgOH precipitation, and then the process parameters can be determined and the engineering design can be guided. Finally, according to the simulation results, the optimization suggest of the sterilization module is given.
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