| 大坝下游水体溶解气体浓度超饱和模型研究进展 |
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| 引用本文： | 陈雪巍,程香菊,詹威.大坝下游水体溶解气体浓度超饱和模型研究进展[J].科技导报(北京),2009,27(17). |
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| 作者姓名： | 陈雪巍 程香菊 詹威 |
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| 作者单位： | 中山大学工学院,广州,510275 |
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| 基金项目： | 国家自然科学基金项目，中国水利水电科学研究院开放研究基金 |
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| 摘 要： | 大坝泄水建筑物过流水体强烈掺气容易导致下游水体中溶解气体(TDG)浓度超饱和,使下游一定水深处的水生生物遭受气泡病的危害,因此有必要对大坝水垫塘内强紊动水体的气液传质问题进行研究.本文对国内外TDG浓度超饱和模型的发展进行了简要的评述,分析总结了TDG输运方程、气液双流体模型、气泡界面传质系数、传质面积、气泡直径、掺气浓度和有效饱和浓度等的研究进展及其优缺点.其突出的问题是对气泡动力学认识不够,气泡数量、气泡聚并与破碎、气泡尺寸、气含率和气泡速度的求解仍存在诸多假设和尚需实验验证的系数.预测模型发展受到湍流模型、气泡表征方法和TDG输运方程的限制.本文为更好地完善水体TDG浓度超饱和模型提供了参考和依据.
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| 关 键 词： | 数值模型 总溶解气体 超饱和 气泡传质 |
Progress of Model Studies on Total Dissolved Gas Supersaturation Downstream of Sluicing Dam |
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| CHEN Xuewei,CHENG Xiangju,ZHAN Wei School of Engineering,Sun Yat-sen University,Guangzhou ,China.Progress of Model Studies on Total Dissolved Gas Supersaturation Downstream of Sluicing Dam[J].Science & Technology Review,2009,27(17). |
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| Authors: | CHEN Xuewei CHENG Xiangju ZHAN Wei School of Engineering Sun Yat-sen University Guangzhou China |
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| Institution: | CHEN Xuewei,CHENG Xiangju,ZHAN Wei School of Engineering,Sun Yat-sen University,Guangzhou 510275,China |
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| Abstract: | The strong air entrainment is related with the hydrostatic force of the water column,which increases the pressure within the entrained bubbles.This phenomenon may lead to the Total Dissolved Gas(TDG) supersaturation downstream of spillway and aquatic animals may suffer from gas bubble diseases at a certain water depth.Thus,it is necessary to study the gas-liquid mass transfer of turbulent water in still basins.The paper reviews some representative models of the total dissolved gas concentration both at home... |
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| Keywords: | numerical model total dissolved gas supersaturation bubble mass transfer |
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