(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 基于鋁電解槽內(nèi)流體體系及電磁場分布特點，建立了非線性磁流體動力學(xué)淺水模型，并應(yīng)用此模型對某300 kA電解槽的熔體流場及鋁液−電解質(zhì)界面波動進行瞬態(tài)數(shù)值研究。在此基礎(chǔ)上，通過動力學(xué)計算分析極距及鋁液區(qū)垂直磁場對磁流體穩(wěn)定性的影響。結(jié)果表明：隨著極距的減小，界面波動由穩(wěn)定趨向于不穩(wěn)定；減小鋁液區(qū)的垂直磁感應(yīng)強度能大幅提高磁流體的穩(wěn)定性。
關(guān)鍵字: 鋁電解；磁流體動力學(xué)模型；穩(wěn)定性；數(shù)值計算
nonlinear shallow water model
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:A nonlinear magnetohydrodynamic (MHD) shallow water model was established, based on the characteristic of both the fluid system and the distribution of electromagnetic field in cell. Using the model, a transient numerical study on the melts flow field and the metal-bath interface wave in a 300 kA cell was carried out. Furthermore, the influence of both anode-cathode distance (ACD) and vertical magnetic field in the metal on the MHD stability was analyzed by dynamic computation. The results show that the interface wave tends to be unstable from a stable state with ACD decreasing, and the MHD stability can be improved markedly by reducing the vertical magnetic flux density in the metal layer.
Key words: aluminium electrolysis; MHD model; stability; numerical computation
