过坝水流过饱和气体数学模型研究
首发时间:2012-11-16
摘要:由于水中气体过饱和或者氮气超饱和会对鱼类或者其它的水资源产生危害(主要是气泡病), 自从六十年代以来一直被认为是水质方面特别关注的热点. 其中围绕气体向气泡界面和水体表面传质机理的研究是深入理解并解决该问题的核心步骤。本文中,引入气体向气泡界面和水体表面传质的机理,建立了三维紊流两相流模型来模拟气泡在水体中的运动和溶解。在此模型中,考虑了众多对溶解气体浓度产生影响的复杂因素包括水深,压力,卷入的气体体积和气泡的大小,数量,及其在水体表面的溢出、水和气体的相对速度和多项流动参数等。模型对葛洲坝饱和气体进行了模拟预测,并和实测值进行比较,对比结果良好,验证了所建立模型的可靠性及其相关应用的有效性。
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Simulation of Dissolved Gas Supersaturation downstream of the spillways
Abstract: Regulation of total dissolved gas (TDG) supersaturation has been a water quality issue since the late 1960s when TDG or nitrogen supersaturation was identified as a potential threat (gas bubble disease, GBD) to fish and other aquatic resources downstream from dams. The mechanism of gas diffusion to bubble interface and water surface thus play important roles in the prediction of total dissolved gas (TDG) concentration. In the paper, A 3D computational fluid dynamics model for predicting unsteady two -phase flow is developed in this study. The model includes multiple contributing factors to the bubble transfer and the surface transfer, e.g., water depth, pressure, the entrained air volume to the supersaturated gas. The model is tested on the data from Gezhouba. The results reveal a good agreement between the simulated and the observed TDG concentration, which demonstrated the model feasibility and prospect.
Keywords: Environmental hydraulics flow downstream TDG
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