污水不同排放流速对扩散器内海水清除能力数值模拟研究

Research on numerical simulation of diffuser seawater clean in different flow velocity of sewage

在污水排海工程中,扩散器可提供给污水极大的初始稀释能力,对海洋生态及水质能够起到明显的保护作用。文章针对目前污水排海过程中的海水入侵问题,以数值模拟为主要技术手段,通过分析多种污水流速条件下的扩散器海水清除过程,掌握其流场变化机制。通过研究得出,在污水流量相对较大的情况下,污水清除时间较短,污水出流后与海水混合效果较明显。初步掌握一般形式下的扩散器海水临界清除流速,为解决实际工程中的海水清除问题,提高工程运行效率提供实际依据。

In sewage discharge project, the diffuser can provide great capability of initial dilution, and it can preferably protect marine ecology and water quality. Aiming at seawater invasion, the numerical simulation was used as the main technical means in this paper. Through the analysis of the diffuser seawater sewage flow under various conditions of the cleaning process, the flow field change mechanism was obtained. The research result shows that when the sewage flow is relatively large, the time for sewage clean is short, and the mixing effect of water flow is obvious after mixing with sea water. It grasps the diffuser critical sea clear flow of general form, and provides practical basis for improving the efficiency of operation of the project and solving practical engineering problems.